Causes When Oxygen Sensor Replaced and Code Keeps Coming Back
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- เผยแพร่เมื่อ 4 เม.ย. 2023
- Fixes when a changed O2 sensor code keeps coming back.
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P0171 Error Code Video:
• 9 Causes and Fixes for...
Be sure to check for other codes.
Posible Causes:
⦁ Oxygen Sensor Circuit
The Error Code Didn’t Clear
O2 Sensor Wiring Open or Short
Blown Fuse
⦁ Exhaust is Clogged or Leaking
Catalytic Converter Clogged
Exhaust Leak
⦁ Engine is Running Rich or Lean
Bad MAF Sensor
Bad Injector
Vacuum Leak
ECM/PCM Failure
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Why is this video under watched and why wasnt this my first video suggestion for this code ..!?!? This is an excellect video of everything abt this code that i bave been through since having it lol
Thanks what a great video know your stuff and I appreciate it. Just want to say thank you. You have a great day
You ROCK! thank you so much for your clear and concise analysis of returning O2 sensor codes, very helpful🤘🏼
2013 Chevy Equinox...changed O2 sensor upstream & downstream.. 4K road trip was fine entire time...light back on..replaced both srnsors again yesterday...light back on today...its running great...
Maybe a fuse??
I replaced both o2sensors and the light didn't go away, my problem was that connection was not plug in all the way, so I plug it and the light when off.
The plastic clip connection right? I tried pushing it in all the way and I feel that it might be my problem. I never felt a click and when I pulled it off it came off relatively easy compared to the one I replaced
Great video
I have an iS 250 Lexus 2006 What about spark plug and coils could it cause p0138 ? I put a brand new map sensor and a brand new O2 sensor. and I also noticed a leak on the flange coming from the manifold to the converter. Fix it and still getting code…thanks
If the relay is bad will it make for low voltage code only 1 o2 sensor only?
So i have a 2008 Honda odyssey and been getting the codes po155,po134,p2240,p2251. The oxygen sensors have been changed numerous times along with the catalytic converter, the codes keep coming back it's really been a pain in my side for the past 5 years I've spent so much money trying to get these codes cleared. What can you suggest?
Yeah but if its a clogged CAT then you'll get a downstream O2 sensor code as well! But the upstream sensor will definitely be a number of issues like you said
thanks for this--- I'll be checking all my fuses and such as he recco. Much appreciated
I have Both o2 sensor codes and a P0302 Cylinder 2 code I swapped coils and spark plugs… my final guess is a clogged fuel injector/ and or fuel pump and filter. 2014 ford mustang GT (5.0)
My oxyg sensor new but light still on Engine light with the code maybe the intake need replacement?
I have a P2251 code on my 2009 Kia Spectra EX. I replaced the Oxygen sensor and exhaust manifold/catalytic converter but I still get this code and have low RPM's
Also I had a question for you. They said an autozone I had it found out what my codes were and I got APO 430, and I changed it. The 02 sensor bank 2 AM I supposed to change both of them on the right side. I changed the upper one I think I'm just gonna change the lower 1 also, just for s**** and get. Wasn't too sure thanks have a great day
Thanks for the video, my obd2 scanner is reading that my o2 sensor is -2356ma any idea why is that?
Please explain if you would how an exhaust link underneath your truck or car can affect how the 02 sensors read the ambient air (outside air)(which now has exhaust fumes in it from a leaky exhaust pipe) would alter the downstream sensors ability to send the proper information To the computer Which has to make adjustments according to reading the downstream sensor is getting.
Remember there's an exhaust leak under there. So the downstream sensor maybe the upstream sensor as well is confused.
I assume the leak would have to be BEFORE the 02 sensor like a cracked manifold.
I have a 2000 Chevy Silverado 5.3 just replaced all four O2 sensors, gas cap fuel filter and another little chip plug-and-play deal on top of the fuel tank. I've reset the OBD2 service engine soon after each service and continues to come back. Along with my brake light and ABS light. It might be coincidental but all happened same time. Any ideas?
Check vacuum leaks ( any air hoses on your engine that are leaking) also check your circuit. You pray to jesus it's not the catalytic converter.
If you replace the sensor on the downstream, what else could it be because I replaced mines but i still get a 0036 0141 code. I check live data. Its reading high, around 600-700 millivolts on the old and the new sensor. Plz help
I had a 1,2,3 cylinder misfire and took out my downstream 02 sensor and was loud but ran with no errors. I then placed the suspected bad 02 sensor on the right(other) side and the codes followed to 4,5,6 cylinder. So I bought a new 02 sensor and replaced it on the right side and still getting engine bogging down on 4,5,6 - Any ideas what my problem might be?
So I've replaced the mass air flow box and o2 sensor and fixed the exhaust. It's a 2003 ford focus . Still doing the same code and running and idling weird but hasn't put a check engine light again?
Possibly vacuum leak
My issue is that my 03 350z is having two p0037 code. I replaced the o2 sensor and replaced the fuse yet it’s still there. I unplugged and plugged back in the sensors hoping maybe I didn’t click em in right but still code is there so I’m lost now
My sensor was throwing a code and when i tested it, it seemed faulty.
Ordered a new one, and it finally cleared the code until recently the check engine came back for slow response. Connection seems good. Not sure what else is causing it. 1133 and 0113 are my codes.
I have been chasing the dreaded p0300...random misfire. We did a date scan and found a bad coil and a bad injector and the evap wasn't functioning correctly. Got all those fixed, truck ran great, the next day sluggish again, now I have a p1133 code.l and p0175 What the heck?
can you do a video on p2237 codes thanks
I have 2010 Toyota Camry that won’t start after replacing the O2 sensor the upstream it will not start. It will crank but it won’t start. Somethings wrong. I definitely need help.
I have P2196 fault code on my Skoda Octavia 1.4 TSI 140hp, when I remove this code from ECU, every 5 to 6 days comes back.
I replaced O2 sensor before catalyst, all spark plugs and one induction coil on third cylinder because I had a missfire fault code on third cylinder.
I don't have any problem with power on car, no problem with fuel consumption( I have average 5 liter on 100km).
If you know why I have every 5-6 days this fault code.
Maybe I must to change all of inductive coils.
I jesili li rijesio taj problem?
My Accord V6 threw a P0130 code for an oxygen sensor but it was because I embarrassingly neglected the air filter for so long it was totally clogged. It's been 3 months and the light hasn't come back on.
these O2 sensors are a major pain in the butt and I don't really see the purpose for them these days, In Ohio only 5 counties require E-Checks. Cleveland is no more a major factory-polluting city, Get rid of Echecks guys!!
I have a 2016 Ford explorer XLT and i change Both o2 sensor the shop told me it was that but now check engine light turn on by putting my car in gear po161 code please somebody help me
could an air intake leak be a cause for the code to return?
Yesss i had a huge hole in my throttle body air intake rubber.
I got the cat changed last year for catalytic converter P0420 error on my 2016 CRV. 6 months down the line I got the P0139 error. I changed the downstream sensor this time. 2000 miles more I again got the same P0139 error. I called Denso and they sent me a new sensor because of warranty. I called the mechanic to reinstall the downstream sensor and he says P0139 error may be because of upstream sensor also and recommending to replace upstream sensor. I am so confused this is driving me nuts!!!!!!
For us, after replacing two O2 sensors and still the same problem, thanks to this video -- it was a cheap FUSE!
I got a 2013 chevy equinox with a p2097 code was getting a sluggish acceleration to hesitation when accelerating.
Same. Did you ever figure this out?
@@dillon6320 was both O2 sensors but you have to recalibrate them aswell
Changed all o2 sensors codes kum back Chang maf sensor as well code came back
Hi I have a weird one for you I have been pulling my hair out about this one and I'm not too sure where to go next besides changing my PCM but one day I got a code bad O2 sensor in my 05 Dodge Stratus 2.4 L dual overhead cam long story short I replaced the O2 sensors both upstream and downstream I cleared the codes started my car and the code came right back but came back as a low voltage for the O2 sensors so I've inspected all the wires and everything everything looks good the weird thing is if I unplugged the O2 sensors and clear the code the light stays off for about 30 miles and then it comes back as a high-voltage code but how is that if they are unplugged have you ever ran into this issue before just curious?
It is hard to say, but a failed PCM is fairly rare. Wiring issues can be a pain and often hard to find. I would check for any exhaust leaks or a clogged catalytic converter. Many techs would swap out the sensors again with Denso sensors.
@HVAC_Mechanic well my cat is hollowed out and I had a o2 code after I did that and had to install a restriction adapter to the downstream and the light was off for years until about a month ago the o2 code came back and my upstream o2 was melted so I replaced both upstream and downstream with the adapter on the downstream still plugged them in cleared the codes and as soon as I started it there were codes for low voltage on both o2 sensors tried to clear the codes again and same thing but with them unplugged I drove the car for 30 miles or more without the engine light coming on but when it did come on finally with the o2's unplugged it said that I had a high voltage reading from the O2 sensors which I thought was very odd considering they were unplugged the wiring and everything looks intact I can't really find any breaks or rubbing marks on any of the wiring is it possible that I could have a relay doing this to me
Hi I'm just curious do you know the voltage output from the O2 plug on the harness I'm getting 829 volts on my multimeter but I'm saying that I should have 12 volts there
Another reason could be a POS aftermarket sensor. Bought cheap o2 for my Altima. codes kept on. Replaced them with OEM and the code went away.
Could it really be it
My mechanic has replaced my O2 sensors twice in the last 2 weeks and each time my car gets worse afterwards. It's after the first time he changed them, it started to hard idle and when I went to pull out in first for a second gear from a slowdown more stop the engine would sometimes sputter out and die. Pulling over turning the car off and turning it back on would allow me to get a gear and accelerate again. I'm at a loss for what's wrong, I don't know if they'll be able to figure it out and I don't think replacing the O2 sensors a third time will help. I feel stupid for getting them replaced once when all my issue before was just the check engine light really.
A bad 02 sensor should not cause the engine to run badly. The engine will not go into what is called a closed loop and be less responsive but should still run OK. I would look for other codes as there likely is another issue.
@@HVAC_Mechanic
I'll go to autoZone and have them look at the codes again. if it's still bad after going to the mechanic on Monday I'm finding someone else :( it's making a tinny rattling noise from the passenger side of the engine now too. All these weird symptoms only started after they messed with the sensors.
The codes before they changed the sensor the first time were
P0137
P2097
Secondary
P2270
I would like to fix it myself but I am beyond amateur and wouldn't be able to figure out what's wrong with it :(
I replace all 4 o2 sensor and after that I get the code P0402 with I think is the bad catalytic but i was hoping for and answer
A P0402 code is an issue with the EGR valve "Exhaust Gas Recirculation “A” Flow Excessive Detected". Here is a video on it th-cam.com/video/KAcaDElYKxU/w-d-xo.html
I keep getting po172 - po175 oxygen sensors running rich bank 1&2.
After replacing my injectors grom 1 hole to 4 hole. I did a fuel pressure test. Put new fuel pressure regulator. Codes came back. New spark plugs, codes came back. New coil rail, codes came back. Replaced upstream oxy sensors, codes came back
Cleaned throttle body and IAC looks new and moves, codes came back. Rough idle continues, going through 1/2 tank fuel in 50 miles. No smoke.
Took to Firestone diagnostics, can't figure it out. Going back on Tuesday, July 25th.
Did you ever get an answer? I’m having the same issue
@@courtneywomack414 No! Not yet. Firestone told me to replace the TPS and use Mopar parts. I've been using after market parts. Waiting on a quote from them to put in a Morpar TPS, but I'm thinking, it all started from the cheap Chinese injectors I put in and might have them install the Chrysler OEM one's? Expecting a callback, and going to ask a quote for that. Probably gonna cost me $800? I have no cash, but, I have their C.C. which will make it easier to make payments. What brand of parts have you been using? I'll let you know if this solves my problem.
Never thought about changing your catalytic converters
@@TB12DAGOAT It was replaced about 2 year's ago, but I was thinking, maybe since my Jeep was running rich for about 6 weeks, may have clogged them? But I did replace all 4 O2 sensors. Thinking maybe time for Seafoam??? Update: I replaced the injectors with Chrysler OEM, and the Codes stopped, but still idling rough cold. TPS, MAP, IAC, Coil and plugs are new. Need to check plugs, may have gotten foiled, but don't think so in that short of time.
Maf sensor and or Map??
i recently replaced my o2 sensors 4 off them on my 2015 Chevy silverado but check engine light still on can i get some help on findig the problem
Did you fix the issue? I have the same issue. Had the P0420 code changed both cats, changed all 4 C02. Code for bad 02s came on the next day.
hey guys how to code this oxygen sensor after the replacement ? i heard i need to turn off the battery but i'm not sure about that 😕
Most use a scan tool to clear the code and see if it returns. Often, a battery cable can also be removed, but this will also reset other things, such as the radio.
@@HVAC_MechanicI bought the sensor after the catalytic converter from BOSCH but the one before it I bought from another brand, would that be the reason I still have an error code on the sensor before the catalytic converter ?
@@HVAC_Mechanici already orded a new one from BOSCH as well, i'm waiting for the delivery.
I got an EVAP/vaccum code at the same time as a bank 1 sensor 1. Havent found anything to fix it yet
Let the code sit. Don’t reset. Drive it as you normally would. It’ll clear on its own after a couple days of normal driving.
@@markdavis8586 its been a about 2 months
Here's a possibility...FCA issued a TSB to REPROGRAM the PCM back in 2008. The TSB is #18-011-08. This is for a false P0139 code being flashed intermittently. This will cause you to FAIL YOUR SMOG INSPECTION!!!
I used AF sensor from china but code still in the scanner
Can you pass a smog test for DMV with engine check light on?
I replaced both O2 sensors in my 1998 buick century li.ited. now the anti brake light and service engine soon light stays on plus the car cuts off while driving it. What's wrong?
I cleared all codes my only code coming back is 135
I replaced with a Bosch should I have done a denso?