P0420 Oxygen Sensor Fix
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- เผยแพร่เมื่อ 29 มิ.ย. 2024
- Here's how to modify your car's oxygen sensor to get rid of a P0420 OBDII code, clear the check engine light and pass an emissions test.
The P0420 code is thrown when the computer detects irregularities in the signal coming off of the secondary oxygen sensor. If the catalytic converter is operating at less than 95% efficiency, the code comes up often indicating the catalytic converter needs to be replaced.
Catalytic converters can get quite expensive for an OEM replacement, and since these codes often show up on cars that are older, it isn't cost effective to replace. Aftermarket replacements may work, but are known not to last as long as the OEM catalytic converter.
Using a spacer on the oxygen sensor is another method to deter the P0420 code from showing up, as it exposes the O2 sensor to less oxygen passing through the cat, thus fouling the readings.
However if your car's underbody is rusty and the Oxygen sensors are likely frozen, another method can be deployed, that is to change the O2 sensor's outputs before it goes into the ECU. This will adjust the computer into thinking the readings coming in from the cat are legit and it can pass an emissions test.
This is done using an RC circuit, which acts as a low pass filter. It only costs $0.50 or so for a capacitor and resistor, which is to be soldered in a series-parallel circuit on the secondary oxygen sensor line.
On this Honda Accord, the oxygen sensor wire is under the seat. The white and blue wire represent negative and positive. The resistor is spliced in series and the capacitor is spliced in parallel. Further explanation about RC circuits is demonstrated in the video.
Once the vehicle was driven for 40 km, the check engine light stayed off and the emissions test was passed with only one "not ready" monitor.
Note: The capacitor and resistor values presented here are a starting point. It may require some tweaking to get the correct value that works with your vehicle.
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Brilliant explanation on how the O2 sensor works bro you need to do more videos like this helped me understand a lot!
I learnt more in this one video than the last six months of trying sort out issues with my Audi S 5 👍
Did it fix your issue?
This is a great alternative to using a non-fouler with the O2 sensor and is even cheaper! You bought all the parts with the change you found on the carpet! I'll consider this fix for my '05 Element which has the same engine. Thanks!
Non-fouler with the O2 sensor or 02 Sensor Spacer is not allowed to buy from California !
@@criticman5221 Didn't work for me at all. Had to buy a new downstream HO2 sensor. At least I didn't have to replace the cat!😆
Downstream sensor has to work in order for this to bypass the converter
Most direct mater of fact tutorial with actual examples on the subject
Awesome tutorial
Thanks glad you learned from it
I would have blacked out VIN data on your report, never know about the government. Great video BTW.
Thanks for the video! My code reader isn't as advanced as yours, and neither is my grasp on your method. After trying and failing at putting the O2 sensor in a coupling (sensor was too big) I ended up changing the spark plugs, putting in high octane gasoline and seafoam additive, erasing the 420 code and driving until all 8 monitors cleared(about 75 miles). Then I headed right to the inspection station, passed inspection, and 10 miles later the 420 code came back on. At least I got a legit inspection sticker, so I can troubleshoot further without getting a ticket. Thanks again for the video, I was intimidated until I watched you at work.
DEQs are bullshit any way, way to go for beating the system!
Thanks so much. Did the hack yesterday on a 2002 corolla with 230,000 miles and passed inspection today. In the past, a tank of premium gas worked. but this time ng. also tried Scotty Kilmer's suggestion to add one gallon of lacquer solvent and it helped but not enough. engine light did not come on for 60 miles vs. 40 prior to. also attempted the spark plug non fouler fix but could not budge the sensor with special sockets borrowed from advance auto, breaker bar with extension, and propane. 15 years of exhaust heat and salt air at the jersey shore! just as well - i'm sure the threads on the sensor and bung hole are shot. the hack was the last shot before donating the car. And it worked! Your science info. was excellent. Googled rc circuit and capacitor and learned more. You should get an award! but don't put in for it on earth (you may end up in the pokey)- wait for heaven. oh - got 5 resistors and a capacitor for 40 cents - 90% sale at a radio shack going out of business - it just keeps getting better!!
+JOHN HIGGINS Man I am really glad to hear it worked out for you and on a Corolla. Good to hear you tried the other methods. What resistor and capacitor values did you end up using?
1.0uF(50V, 20%) capacitor and 1Megaohm (1/2 watt, 5% tolerance) resistor. Basically the same values mentioned in your vid. I didn't have choice regarding values in parantheses as I was limited to what was in stock at the store which was closing. not that it mattered because I don't know enough to know the best values.
Wow! Man you've try everything on TH-cam. Scotty Kilmer, non fouler fix and now this. I got a 2003 Corolla with 223000 miles and same issue so maybe I should just take this approach. Was going to do the gallon of lacquer solvent the if it don work then the non fouler fix but I had the same concern not being able to take the 02 sensor off and retro fit it. Car ran fine just the annoying check engine light and we don't do inspection in Minnesota.
I was pleasantly surprised that it worked and passed inspection. it has not yet been a week. i will update if light comes back on or goes 1,000 miles without coming back on. this may take a while as i have returned the car to my daughter who is currently doing limited driving. Like yours, the car runs fine but it does burn a quart of oil/month when driven ~ 1,000 miles. this may be connected to the catalytic converter malfuction/error code.
so if you are considering the hack just to get rid of the light you may want to wait for my updates. if you do go ahead with it anyway, if a newbie, you should practice soldering first. it is easy but you need to take some precautions: sand the wires, use flux, and separate pieces to be soldered with pieces of sheet metal (so the solder on one connection doesn't inadvertently drip to another), and wrap with electrical tape to make sure the soldered connections do not touch each other and short.
as your corolla is the next generation from my 2002 i think you may have easier access to the oxygen sensor connection by the passenger seat.
once accessed, you should disconnect at the connector and strip and cut wires as shown in speedkar99's vid. there is no need to remove the oxygen sensor. all the work is can be completed in the car. i had to remove the front passenger seat and the shifter harness to get to the connector. but it seems access is easier for the 2003 model.
came across this website for sensor access/removal which may prove useful to you:
www.toyotanation.com/forum/132-corolla-9th-gen-1st-gen-matrix-2003-2008/1354081-diy-downstream-oxygen-sensor-replacement-2003-2008-corolla-lots-photos.html
Good luck!
Update - Light came back on somewhere between 200-500 miles. but at least i passed inspection. So, Tous, I can't vouch for the hack to be effective on your 2003 corolla and your goal to eliminate the light, as inspection for emissions is not a consideration in your state.
Terrific Video... Thank you. Many things in it are way beyond my understanding, But i may muster up the nerve to try this!
Glad it helped
i got this code from a bosch o2 sensor for my toyota. i bought a denso o2 sensor and the code went away. sometimes the brand does make the difference even though it shouldn't. great video!!!
great work i also have a solara. yours is so nice. mine is supercharged and it makes a big difference in acceleration
+jay7264 Sweet. Yea my solara can feel sluggish at times, you really have to give it throttle before it can pull.
I bought a kit online for $20. It helped me connect to my ECU. I switched off all catalytic converter monitoring. Easy. No hardware.
source>?
it's an Electrolytic Capacitor before anyone comments..
the reason the signal is so smooth is the resistor limits the current for starters.
and the capacitor acts like a controlled power source only allowing a limited current each time,
by changing the capacitor you can alter the 'wave form'
basic electronics.
I agree it it basic, yet some of the writings i have seen make this complicated
This is a really usefull tutorial
The catalyst will have a lot of difficulty setting the monitor, due to not responding to the computer's intentional lean/rich commands.The computer will push these limits to TEST for an appropriate response from the catalytic converter. It looks for voltages ranging from 0.10 volts, to 0,90 volts. Outside these limits indicated a failed sensor.
While a "steady reading" may be desired, the computer will force the system lean and look to see that it gets the expected response. It will do the same for the rich. The bypass will prevent these results from matching what is expected, and not let the catalytic monitor to set, OR will throw catalytic converter codes or REAR oxygen sensor codes. (Hope this clarifies a bit)
bro you are a genius much love from Boston!!!
You are my hero! Honda Civic Ej9 2000 fixed!
Good to know
i just done this on a 2003 toyota seinna. first attempt hooked up wrong. check engine light came on right away. redid it. but it took so long to go into readyness mode. but it worked. thanks
Do you recall if you used the 1M resistor and 1 microfarad capacitor?
@@bradleysmith1064 its been awhile buy yes with a 3 watt resistor i think i used a 6.3uf capacitor 16volt
Thanks man. After I read about how O2 sensors output data I figured that you could make a circuit board, resistor, capacitor, and power source that would mimic the sensor output. This is way easier then what I was trying to do.
+daniel evans This is if your cat is still half working (below 90% efficient)
@@speedkar99 what if i don't have a cat?
I couldn't get this to work after too many attempts with different values, so I made a spacer out of non-foulers and that worked wonderfully.
Hello, which bank o2 sensor did you put fouler on? I added it to bank 1 on my 2006 toy sienna n it varies from 30 miles to about 300 miles before lights come back on. Will it work better on bank 2? Or should I have it on both banks?
@@tomgaffney740 both banks, rear sensors only, and only if you have p0420 and/or p0430
@@kellismith4329 i have P0420 on my honda fit 2015 . Will adding fouler on secondary o2 sensor will turn off the engine check light . Or will the light come after a period of time
@@manuvaldavis1048 if there is an issue with your converter, you may have to remove it and put pipe instead - at that point your car will show a p0420 in it’s absence, then you install the antifouler to trick it into thinking the converter is still there. Driving with a messed up converter will only get worse and can mess up the engine
@@kellismith4329 if the problem is with o2 sensor, can we use fouler. Will it remove the error
I fixed the P0138 high voltage code that came on after this mod by using 1M and a 4.7uF along with another 1M resistor across the 4.7uF cap (signal to ground in the same spot as the cap). I now have a nice smooth line at about .8V and a happy ECM.
You are welcome
Make and model?
Can you show diagram for your job
Great video! Will this enable the catalyst monitor to go into complete/ready status?
You always kick ass man! Thanks.
I would modify the harness on the O2 side instead of the factory harness. It is much easier to do also since you can do the work on the bench then do the install. I hope this helps and thanks for providing the great tip on fixing this annoying check engine light.
Yeah good luck trying to remove the Rusty sensor
But then your fix is easily visible to anyone. If you have a commercial vehicle and get stuck in one of those DOT roadside inspections , you are looking at a major fine and even jail depending what State you are in.
Ya your repair won’t last long hanging under your car though
Hi i bought a Toyota celica, the last owner has done both sensors with the same trick as you. Should i remove the tricker on the sensors number two. ?
Thanks for posting this. Should the specs of the capacitor change depending on the car brand or application? There is another video recommending a 4.7 uF capacitor. Also, do you know of this having worked on a Mercedes? The Mercedes ECM sends a number of tests to the sensor to check for integrity. I wonder whether this mod would trigger new CEL or faults.
The computer is looking for a voltage that doesn't fluctuate very much from the oxygen sensor. The larger capacitor value of 4.7uf should accomplish that as well as the 1uf recommended here.
Exactly what I was looking for
You are a genius bro this is awesome
Thanks. Did it work for you?
That was pretty damn good!
your the man
Your videos are fantastic man. Learning a ton off your videos. Keep up the good work! By the way what kind of scan tool is that?
Dam iam trying this hats off to you bro.
+Worm Mongoose thanks
Just another person recommending this. 2013 Outback with too many km's to justify the $2000 catalytic converter replacement. This RC circuit has me seeing .52v steady when looking at an OBD scanning app on my phone. Here's hoping it works in the long term.
@@lostconciousness4255 Sadly no. For two days no CEL, then it popped up again, this time p2096 (I believe) for lean mixture. Fiddled and fiddled, finally no go.
So I recently bought a new O2 sensor, currently waiting for the CEL to pop again. If it does, new cat for me.
Finally, your Smoke Checked showed that "Catalyst Not Ready" and the "Catalyst Not Ready" is "Failure" of the Smoke Check in Van Nuys, California (Feb. 10, 2023) !
Great vid as I was trying to do this. You think I can use the same resister and cap values for V6 1MZFE engine similar to your solara?
+rhpham2 It's only a starting point. If you get other engine codes you'll have to keep experimenting until you come up with the right RC constant. Of course if you have a working 1MZ car to try you could reverse calculate the time constant from its graph output.
What kind of code reader scanner is that I'd like to know I'd like to get one seems like a good one
Yeah
If you modify the vehicle side of the harness, if that sensor ever fails, you won’t have to rebuild the RC circuit… good explanation of how a filter circuit works…
Man ... you are on another level, I bet you're an engineer, my fancy college Control proff doesn't know shit about these wiring stuff :( brilliant job bro, with some good marketing descriptions at the beginning/ending of your videos you should have at least a million subscriber in less than 6 months, you're simply incomparable with these clowns youtubers out there
+moe raw thanks I'm glad you appreciate the effort I put into my videos. I'm a mechanical engineer with not much knowledge of electronics.
He's not an engineer, he's just not American that's why he's smart
I have a 92 3.1 rodeo with one oxygen sensor that only has one wire how do I bypass that to eliminate the code.?
yeahhh, it worked!!! i tried on my Civic 1.7 2004 and no more check engine light..
Jijie Ko haha... civic...
Does this save you from replacing the cat or sensor ?
I have a 08 GMC Yukon and have changed out the catalytic converter and oxygen sensors and still getting a P0430 and P0420 codes.
I'm an engineer and I FOUND THIS IMPRESSIVE SIR
Thanks
Now you try 😎
I was just about to say the same thing its rare to find videos like this
Thanks for the video. Were you using flux-core solder? Looked like regular plumbing type solder on the video, which would explain why it didn't take too well on the wire.
Does the catalyst monitor change to ready after a couple of drive cycles or does the ecm know it's being messed with?
+Koffi Banan The wire itself is hard to solder. This isn't plumbing solder. It's probably coated with some anti-stick treatment to protect the oxygen sensor wires from the heat of the exhaust.
I haven't seen the catalyst monitor change to ready yet. But I've ready it takes a while, if not forever on many cars for it to go ready.
And yes you might get a frozen oxygen sensor code if the resistor capacitor values aren't correct after driving a few hundred km.
Ah, yeah some wires can be a pain, what usually helps is using some sandpaper on them and then the aggressive acid based flux like S39 RVS. I use this method to solder RVS bicycle brake and shifter cables at the ends so they don't fray out. You can also fix broken off cable ends on for instance lawnmowers this way.
Anyway let's hope the Honda stays oblivious to this little hack!
Thanks for the tip.
very well done, thanks for sharing.
+M Stewart thanks Stewart
Can I do this on a Jeep JK 3.6 engine? The colours are different, 2 white wires one black and one grey, which one is positive and which one negative? Thanks a lot!
Thank you for a great in depth video, I have a V6 accord and I'll be trying this fix tomorrow for the bank 1 sensor, same code p0420. Two questions, in your diagram you showed the capacitor wired in series AFTER the resistor has been wired onto the blue wire (in parallel), where as in your actual wiring set up you have the cap wired before the resistor, does it make a difference?
Secondly, my local radioshack has 1M-Ohm 1/2-Watt 5% resistors and 1.0uF 50V 20% Radial Bi-Polarized Electrolytic Capacitor, would these two work? Thank you in advance for any help.
+JnC445 thanks
Yes wiring it backward makes a difference.
With the values you'd have to try a few different ones to get the optimal RC constant for your ECU. Check digikey for a better selection of components.
+JnC445 thanks
Yes wiring it backward makes a difference.
With the values you'd have to try a few different ones to get the optimal RC constant for your ECU. Check digikey for a better selection of components.
+JnC445 thanks
Yes wiring it backward makes a difference.
With the values you'd have to try a few different ones to get the optimal RC constant for your ECU. Check digikey for a better selection of components.
+JnC445 thanks
Yes wiring it backward makes a difference.
With the values you'd have to try a few different ones to get the optimal RC constant for your ECU. Check digikey for a better selection of components.
bruh bruh bruh bruh
I thought of doing this (electrical engineer), but I didn't want to risk using the wrong values and killing my computer. I think I'll try your values and see what I get. Thanks!
Cool! It's a good start , hopefully you get it tuned for the right frequency
@@speedkar99 where do I buy a capacitor and a rc circuit?
Do you think this will fix my 08 subaru tribeca p0420 fault code.Is there any other hack that would allow my cruise & traction control to work again? Thanks, Mark
Badass! I love it. good work again :) Also, yay! Canada ;)
+Ali Shaarawi Happy Canada day
Awesome video! It looks like in this case you would have passed the emissions test even without the fix, since the catalyst monitor still was not ready at the time of the test. I've eliminated a p0420 in a couple vehicles by putting a couple of spark plug non-foulers between the sensor and the exhaust as a spacer (it doesn't seem like it would work but it does). It's important to point out that any work-around like this is only a temporary fix; the catalytic converter should be replaced to avoid increased emissions, exhaust restriction and eventual performance issues
I agree. The only thing is cars here in Canada (mine included) are very rusty so adding the anti-foulers or replacing the catalytic converter is a bit more challenging.
Eventually when the cat fails pretty badly it will produce an O2 signal that the filter can't correct and throw a code.
Ah true, didn't even consider that fact. I'm spoiled since my cars are relatively rust-free (live in the Washington D.C. area). Is there an effective undercoating available, or is just a lost cause trying to fight the rust?
Its mostly a lost cause because of the amount of salt they use on the roads here in winter.
The most you can do is rust proof annually and keep washing the car after snowstorms.
It also depends on the vehicle manufacturer.
Joe Milton
yes, I'd like to know if the vehicle was able to pass the catalyst monitor or not, since resetting the code is separate from the addition of the RC filter. without seeing that monitor pass, it's inconclusive whether the ECU screening parameters were changed sufficiently to enable it to pass. a diode in line for a peak hold may be better if the catalyst is in worse condition than just marginal.
double posted
Thank you for your time and effort in this production, extremely useful information. What needs to be done with the heater signal? I guess what I'm asking is there a feed forward or a feedback on that circuit to the E.C.M. the reason why, I am running Off Road and won't be using the CATcon , but I don't want to incorporate the Fixed components. Adjustable maybe 10-25%!!??
The heater is just a resistor that varies with temperature
@@speedkar99 ok so is that signal processed back to the ecm? And controlled to vary the temperature, once the sensor is up and running does it open circuit? Do I need to fool the heater circuit or just runit open, and hope it senses the heat. But I did notice a heater pin reading on your scanner for mva ?
@speedkar99 I've been told to use anywhere from 1-500k ohm resistors and 10-20uf resistor. I dont know if it matters all that much, but in my Lexus IS300(Toyota) the ecus can be tricky to fool. Do you have any input on this?
Good job! Can you tell me which obd reader you have?
Thanks.
Genesis Evo OBDII reader.
nice video, funny jokes and perfect result :)
So I used a 1mF capacitor and a 1 M ohm resistor and my signal has a low peak and stays very close to 0.4V. I am now getting a code of 'No activity' on bank 1 and 2. Should I use a different capacitor? Thoughts?
Yes
Johnathan Reid i used a 4.7 capicitator. Got the same errorcode p0140. Which capicitator do you advice? (Mazda 6 4 wires o2 sensor?
you are getting far too low of voltage you need to lower the resistance to allow more volts to flow through, the optimum voltage is lower than 0.7 and above 0.4 volts so 0.5 or 0.6 volts is perfect
VileStorms when i try this I’m getting error code p2271( signal stuck rich) any ideas???
The real fix is a new cat convertor. This is somewhat of a "band aid". But I am certainly willing to use it on my 2005 Accord with 320,000 miles. This seems to be the electronic equivalent of using a spark plug de-fouler. It's better though, because it might not be as visible when getting an inspection :) Thanks for the video.
I don’t know if u still read this but just in case, I have a 2006 Toyota Highlander code 430 420 I did what u said with the com pastor and 1ohm r drove it 40 miles and the light came back on with the same code. What would u suggest I do?
Use an oxygen sensor scanner, graph outputs and see the difference. If you have the V6 you've got two banks to compare it against
Will this work on my 2004 LX470 V8, with 2 rear O2 sensors? Is this method similar to those IRD O2 simulator? Please advise
+Michael shaw I'm not familiar with the LX, but I can assume the theory is similar. You'd have to play with the RC values to get the right response for it not to flog a CEL. Let me know it it goes.
Is this mod better than the spacer? or the spacer with the mini catalytic converter?
will it work on something like a new BMW or Audi, ? bu new I mean like 2010 to 2015 somewhat recent.
Very clever!
Also which side is the mod dobe on ecm if harnes or o2 side
what tester did you use to test your oxygen sensor an see the graph moving
I don't remember the name. It was an advanced scanner that can graph obd out puts. Any laptop software should be able to graph now
Does using this fix negatively effect anything mileage/performance/reliability/longevity? I’m just saying, it’s tricking the vehicle to think everything is perfect when it really isn’t. I had MIL eliminators on my mustangs because they had no cats but they also had custom tunes installed instead of the factory programming. So with this fix you don’t need a custom tune? Thank you for your time. Great video as usual!
Eventually you'll need a new catalytic converter
@@speedkar99and what if you don't have a cat there
Thanks for the great video. I'm going to try this. What values should I use for the resistor and capacitor?
+N W glad you found it helpful. You'll have to trial and error to get the right values for your vehicle.
+N W glad you found it helpful. You'll have to trial and error to get the right values for your vehicle.
1M Ohm + 1uF is way too high for the modern ECUs. This is technically an open circuit, you get a new P0138 DTC, and fix 1,28V. I tried with 330K + 1uF too, didnt worked..
Somebody wrote the correct values, but his comment has been deleted! I dont know why.
4,6K + 100uF, works like charm since 5000 miles. Many thanks for your recommendation.
Thanks for your input, hope it helps those in the future looking to do this mod.
I did the mod but I have a problem now... we don't use kilometers in USA , I'll have to drive to Canada to drive a few kilometers and finalize my work .... ; )
+tiz tiz haha good one.
50miles is the written word on them in the freedom land
asshole
You will one day. Just like you are usning kilograms in Hospitals.🤣🤣🤣
@ferkemall Citroën or Renault? Or Peugeot
Thanks for the video. It's been a long time, but do you remember the capacitor voltage? I have searched a lot but cannot find a capacitor from 1Mf to 3v. Could you help me. Thank you
voltage on capactor means maximum it can hold without exploding but since oxygen sensor only produce up to line 1 volt, any capactor voltage will do
@@poiiihy Ok, thanks.
i have ford edge and i want to do this trick but i have grey and black wire which is positive and negative in my case???
Kurd Garage darker color is usually the negative
I thought the "catalyst" was the catalytic converter, the one you spoofed, so wouldn't that not be ready for emissions testing?
This.
With catalytic not ready... this fix is a failure
Mr ravetti, your a failure at being any kind of mechanic. Each system takes a certain amount of learn time to be considered ready from the ecu standpoint. There are things like short term and long term fuel trim, evap , ac, purge, oxygen heated air effic. And could go on.. some systems require a specific milage to be driven at exactly 30mph without decel below that speed which may take a while before a car can be driven the dustance set by mfg to do in order to ready that particular system for a self diagnosis which some systems will even say not ready or even not available. If you remove a certain component or it has a defect ive seen the system completely not recognize its installed and the system still work such as ac... if your car smokes when you drive, it doesnt always mean its burning oil. There could be a neighbors cat stuck on your tailpipe..
one not ready monitor is allowed; at least the MIL is off
Can this is done with pre cat oxygen sensor, ? My vehicle has only one pre cat coverter with 4 same color wires as your's !
No, that's known as an air/fuel sensor...it works with lambda values..
can you tell me what capacitor did you use?i watched your video over and over again i see the 3v 1uf capacitor but never can't found on google i have 04 honda.
If you're saying you can't find the parts you can find them on eBay I just looked them up and they're really cheap. 1 microfarad capacitor and one Meg Ohm resistor.
You can use any voltage for the capacitor. 15v or 25v etc it doesn't matter.
i dont know if this will work but man good vid.
What are the specs. for the capacitor and the resistor? uF and Wats. Great Video.
I used a 1M ohm resistor and 4.7 micro farad capacitor. Worked great on an E46 BMW
What engine analyzer do you use?
What about the o2 heater circuit? If the car requires heat from the cat to reach the correct temp, wouldn't the monitor hang up on the heater? Then the o2 sensor test would never run, unless your car requires a lower temp to run the heater test. In the case where the monitor hangs up on the o2 heater, what would you do?
+Captain heater is a separate circuit
If thats broken you need a new sensor
I was referring to his mod specifically. I wasn't sure if the heaters would reach the correct temp without the cats installed. I'm guessing the heaters get hot enough for this mod to work on most vehicles, I was just throwing out the possibility of one not working without the additional heat from the cats. As for my issue (I still have cats, but this topic intrigues me anyway), I had a blown fuse that was causing all 4 o2 sensors to show a heater code, so the monitor wouldn't run.
Captain he never messed with the heated shit at all... heat makes the sensors work instantly and give accurate readings faster ya goob
You have a bad o2 sensor ( o2 sensor heater circuit is bad) change 02 sensor
The heater purpose is so the computer will go into closed loop fuel control faster. O2 sensors need to be at operating temp to generate a signal
Did the catalyist monitor ever get ready?? Or does this keep it incomplete forever?
I don't recall
HI there , thx for your post, sounds logical. I have a Toyota Avensis Verso from 2004 with a 2.0 VVTI. I have a P0420. I checked everything andy my conclusion is that my Catalyc converter is not 100% anymore. I did an emission test at the garage and it was enough to pass the test. So my concern is to get rid of the P0420. So i tried this yesterday wth 1m ohm and1 uf, today the test cycle is complete The initial vol was between 0.1 and 1.0 volt, with much high peaks to 0.9 v. With the hack the highest voltage is 0.6 volt but stil steep peaks. So i think i have to get rid of these peaks. What should i do ? I m thinking about a higher value capicitator. What do you think ?
Sorry i forgot, I have a now an malfunction of the o2 sensor, so it fixed one but a get an new fault back
+Roel I'm not sure since we don't know exactly what values the ecu is looking for
would this hack also work if they completely bypassed the catalytic converters on a v8 or V6 ?
no
yea
Yea
I've got an 01 Lexus is300. Should I use a 1 or 4.7 uf capacitor?
I deleted my catalytic converter on my stock 2003 honda s2000. keep getting p0133 bank 1o2 sensor mostly every day within 50 - 100 miles after I erase it.. And every now and then I get a p0420 on my bank 2 o2 sensor. I'm using ram air intake. When you have time. Can you please let me know if I can try to fix my problem with your resistor/compacitor method on this video or do I need a hondata version 4 ecu and tune?if yes please tell me what size on bank1 and what size on bank 2.i really would appreciate it
Without a cat you'll always throw p0420 and you'll need a full simulator (and not just modify the existing one)
As for the AF sensor that means there's an issue with your engines combustion, either a vacuum leak or busted injector.
Hi, on my Lexus 3.3 v6 it has a 3 oxygen sensors. Which one I have to solder this elements ? The last one (third) sensor I guess, right?
Hi, geat video thank you. I've just come across it after doing the exact RC filter mod by following another youtube guide The other guide is identical with one difference being that the author recommeded a 4.7uF capacitor instead of the 1uF that you suggest. So I did the mod on my Lexus using a 1Mohm resistor and a 4.7uF 35V capacitor. However, although the P0420 error has gone, I now have an error P0138 - O2 Sensor Circuit Hight Voltage. I checked the voltage reading and it's reading at 1.28V which is much higher than what it should be. Do you recommend I change the capacitor to a 1uF and keep the 1Mohm resistor as it is? Thank you.
Yes alot of this is trial and error.
Read your signal outputs and compare it to the other bank for reference
@@speedkar99 Just to confirm, the voltage signal still needs to fluctuate but needs to do it smoothly rather than rapidly which is what the RC filter does by slowing it down creating smoother lines?
@@speedkar99 I tried 1uF and 4.7uF both are giving high voltage reading. 4.7uF is giving 1.28v and 1uF is giving 1.27v. maybe the problem is with the 1Mohm resistor?
@@johnroberts5357 Yes I had the same issue and used a 360K which worked. I think a 330K would have been perfect.
if voltage is too high you need more resistance. if voltage is too low you need less resistance. if it says slow response you need less capacitance. and i guess if you just get p0420 again you need more capacitance.
Does this work to clear the Catalyst Monitor? As of last year 2016-In California-were allowed one "not ready" monitor excluding the Catalyst Monitor.
+James Lancaster last I checked it was not ready, I didn't check after driving a few more thousand kms though. We are allowed one not ready here.
speedkar99 I have tried this on my 2004 Accord LX (a California vehicle) with SULEV & PZEV emissions. This only delayed the Catalyst Monitor. All monitors cleared except for the Catalyst. This stayed incomplete. After 3 drive cycles I received a CEL for Delayed 02 sensor function Bank 2. So this didn't work to clear the P420 code. In states where the Catalyst Monitor can remain incomplete this may work fine. Unfortunately in California completing this monitor is a requirement.
James Lancaster so this mod will cause the cat monitor to stay in the not ready state? Or you just need to drive till that monitor is complete?
Wow you are a fu$#ing genius lol well done!
+johngamache7 thanks
+johngamache7 thanks
Hi, my check engine light on today . It say catalytic converter defect . But I have change it one month ago . Anyway I erase the code and check engine light gone . So my question is will it come back again. If so how long it will take to come back. Thanks
Golf 5 ( 2008 )
1.4 patrol engine
I drove with bad kat about a week but no engine light on and after I drove another week without Kat no engine light on . When I change my both Kat and drove 500km not engine light. Then I put fuel injector cleaner and drove another 150 km . And after engine light on and it says on my obd2 Kat defect.
Hey bro what did you do with the white wire please
I did this years ago and it worked for a 98 Corolla but not for a 02 Pathfinder.
Ok good to know
Curious- by doing this, will the mpg (fuel economy) and acceleration improve to normal levels? Currently with P0420, mpg and acceleration is really bad..
No it doesn't help with performance. It just tricks the computer
Question.....to keep the car original, for whatever reason, even to go back to stock at some later date....instead of cutting wires..... can you buy a pair of male-female connectors....to capture the "mods" here you wish to make....with the resister and capacitor captured between the new connectors to make an "assembly"....and then plug this "assembly" to the original car's wiring harness connector on one end..... and ( on the other side of the "Assembly")....to the sensor plug?
speedkar99, did this really resolve the issue or did you simply bypass it, thus eliminatiung the CEL? I'm thinking the issue still remains, you've only silenced the cars alarm notifying you of said issue....
Exactly
Your pass with ONE "not ready" monitor caught my attention. However, some bad news:
Ontario, Canada, Readiness Changes
As of October 3, 2016, readiness conditional passes will no longer be issued.
+TheAnalogKid2 thank you for letting me know. You made me dig into this further and I found out they're changing the law April 1 so you don't need emissions to register a car anymore too. More time to get this fixed!
Depending on year of vehicle, you dont need all monitors to be "ready"
Hopefully this all gets scrapped now anyways...
speedkar99 does this mod prevent the cat monitor from completing?
I ve replaced my O2 sensor "1" correctly with brand new oem parts. After few week , the warning light comes back again for the same problem. Is it something to do with a dirty mass air flow sensor ? i need advice to correct the problem. thank you !
The catalytic converter is probably below efficiency and needs to be hacked or replaced
@@speedkar99 yes, it is the cat . i will hack it as yr method
@@speedkar99 i ve hacked bank 1 sensor , i m waiting for the result, no warning light at the moment. The last owner also hacked the bank 2 sensor for some reason(i don't know why). Unfortunately he did the resister on the -ve wire ,now i recorrect all his mistake.. ..Wait & see ! hope the warning lights don't come back
Check your wiring
Hello, is it a 1/2w or a 1/4w resistor? What voltage is the capacitor? Thanks!
1/4
Can something be done like this with the evap system? Specifically to bypass p0456 small leak code?
Not as easily. Better to have your ECU programmed
is it ok if i use 1/8 watt 1M ohm resistor? or does it need a bigger watt resistor thanks in advance
It's trial and error. See what RC value works for you
Hello, thx for video, but how can I solve this problem on a titanium oxygen sensor? It has a different measurement procedure .. THX!
Not sure.
Same thing
My 2005 Honda Pilot has 3 oxygen sensors do I need to do this to all of them or will the codes tell me which ones need it?
Try the O2 sensor spacer
Excuse me sir, what time does the 9 o:clock bus arrive? I need to go to town to buy these parts to put in my 2025 Ford Futura.
Ok
this circuit will slowly charge up the capacitor, taking approx. 244 minutes to load it up to 1v, giving again a bad reading. Any idea how could this be sorted out?
I got a simulation here
tinkercad . com/things/3j1cN3kpOsj (remove spaces before and after the .)
press Simulate, then Start Simulation
2001 Camry V6 here. When buying the 1 meagohm capacitor, should i be looking for 1/2 watt or 1/4 watt?
1/4
Speed kar did you ever have any issues out of this mod ..im about ri try it on a 2006 lexus gs300
Not for a while. It was enough to pass the emissions we had at the time.
I did this on a 2006 vw jetta but did not work what do u suggest
Does it have to be done on the harness for the vehicle or can it be put on the actual o2 wiring?
+Landry Barnett I put mine on the 02 wiring if I remember correctly. That way if you replace the sensor the car wiring is not damaged.
speedkar99 dang that is a long connector for that vehicle! ok that’s what I did but I must have made a mistake. I was wondering in case one of those wires is a shared connection like the EGR wiring for my 5.0 in my 01 mountaineer, in my case I need to put three resistors in basically a triangle to ensure proper outputs for the EGR that is gone and the other component that uses the shared connection. Thanks for your fast reply.
you could put it anywhere, but use solder because crimped connections will corrode.