Great video I just got my whole exhaust system done on my car and once I got the car home I saw the rear o2 sensors coming out of the side of the catalyc converter is this correct?
Clarification please. Between 6-8 inches after the merge would be further down than the video shows. It looks more like 6-8 inches right before the merge and within a few of inches after the true merge collector area. 6-8 inches past right before they merge? The other locations like the clamp on are over one foot past the merge/ collector area. Are these locations this far downstream ok if we have well over 20" after sensor? Great videos. Thank you.
Hey Tom, great video! I've received my "O sensor" without the plastic protector that goes around the metal end, and there's grease all over that end. Do you just wipe it put clean with a piece of cloth, or do you use something else, since that is the part you'll screw in? Thanks in advance for your details, Tom!
I have cut outs on. my GTO. my hotrod shop installed a sniper and o2 sensor goes out after less than 500 miles. on the 3rd one. is this system not compatible with cutouts?
My 02 is 12" after the position you show as the merge location. would this be enough to cause a no start condition and should I block that off and relocate it.
May be a dumb question but I'll ask anyway, if I install a wideband on my vehicle in a location where it's only reading one bank (4 cylinders) of exhaust fumes will that reading be okay for tuning? I would assume what ever reading it's getting will be the same for the other bank of cylinders...
Yes, a sensor on one bank of a dual exhaust is common. The two banks being the same isn't a perfect assumption but it's close enough for most applications. The Holley Dominator ECU has dual O2 inputs so you can run sensors in both banks but other systems like the Sniper only use one sensor and it goes on one bank.
I have stainless Hooker Competition Series LT headers on my SS which are manufactured by Holley Performance products yet I have Insufficient Switching O2 sensor issues ever since swapping my rotten out set of Pacesetter LTs for their product. I wonder if it's caused by the slip fit into the y-pipe being not fully sealed or the placement of the O2 sensor bungs...
Yes, most exhaust mods will cause that or any manipulation of the sensor (most exhausts will move it towards the rear and set it codes). Best thing to tune them out !
Hi, Regarding the optimum placement for o2 sensors. Where or what do you do when a 2 piece manifold system is replace with a 1 piece manifold (upgrade for turbo install). My vehicle have 2 upstream and 2 downstream. Where do the upstream ones go?? Together (side by side) right after the new manifold? Or together after the turbo? Thanks.
Wondering if you can put exhaust cutout after the O2 sensor or if you still need to have 18 inches to 24 inches of exhaust pipe after the O2 sensor th er n the cutout 🤔
Luckily a fouled sensor can be fixed by heating it to cherry red with a propane torch all around and then using a voltmeter to check the response time after that is done. Just connect the voltmeter leads to the two wires that are different colors. The two wires that are the same color are for the heater circuit.
I do wish someone like Holley would develop a listing showing the location of oxygen sensors on cars. I have a 2003 Bentley Arnage T, a classic I purchased, where an )2 sensor filed and I cannot find its location. I came to your video searching for where it might be located. I cannot find old Bentley service manuals and now the Bentley is about to become undriveable because I cannot repair it.
Nice video but I would have liked some input on turbo model engines. Post turbo, pre turbo, distance , ext. I ran mine post turbo about 18 inches down and it seems to be fine but I've always wondered what a *pro* would say about that. I personally only have to so I know what my car is doing and running as my car is a daily. I just hate not knowing what my cars oil pressure, a/f ratio, temps, and stats are at.
I just bought a ram with aftermarket exhaust and the pipes don't meet until near the muffler at the back. Do I still put the sensor at the merge or do I put it near the headers? I don't have cats. The truck sometimes stalls and struggles to run so if you could help me it would be much appreciated.
The position of the O2 sensor should be after the merge of all the cylinders of one bank (ie odd or even side cylinders) not after all cylinders ( both odd and even). Example: After the merge of all 4 collector pipes on the passenger side of ta V8 engine ( cylinders 2,4,6,8). Thx J
After reading the instructions for my Sniper (1" - 10" from the collector)and watching the guy with the yellow 67 SS Camaro install his in the Holley video (1" - 10" from the collector flange) I did what they said. Now it appears that may not be right? I'm crossing my fingers - this is a lot of $$$$!
Good explanation but still a lot uncovered. Make a search on WBO2 sensors and Sniper and you find tons of people having failed sensors. After I did everything right, installed in the right spot, routed wires carefully I found myself now having a failed sensor after less than 2000 miles. First thing that comes up on my mind is to google and improve my location of the sensor. Still cant find any clear path what to do to be sure the problem is addressed. No oil smoke (new heads) and piston rings, no misfire, OK fuel... Maybe can question the EFI cant operate the sensor within its specs??
Wow the best informational video yet , thank you, but I was looking to find out where the male ,& female plug in on a 92 dodge Dakota 3.9 manual transmission, 2 wheel drive ,& also where is the male & female connection for a Crank shaft position sensor, on the same vehicle
I installed a cam in my truck.put header but the header it self did not have a hole to put one in.but I do have 2 connected.and my truck would smell like gas.i also have code for my bad o2 sensor.what should I do?only tuning on 2 o2 sensor silverado 08
For the LSU 4.9. Never turn it on with out running the motor ( #7 ). Info can be found in the Bosch's full line product catalog. Copy and pasted and edited to fit: General Installation Instructions & Requirements: In general, the sensor installation point must be tested sufficiently by the customer for function and durability. 1. Installation in the exhaust line must be at a point guaranteeing representative exhaust gas composition whilst also satisfying the specified temperature limits 2.The heater power must always be switched on power controlled, starting with a maximum ramp up nominal voltage as described in the sensor specifications. This is to reduce thermal stress of the sensor element at cold start due to high peak power in the first seconds. 3.The sensor installation location must be selected to minimise exhaust side stressing with condensation water in order to prevent ceramic element cracking. 4.Locate the sensor as close to the engine as possible, respecting maximum allowed temperature range. 5. The exhaust pipe in front of the sensor should not contain any pockets, projections, protrusions, edges, flex-tubes etc. to avoid accumulation of condensation water. A downside slope of the pipe is recommended. 6. Make sure, that the front hole of the double protection tube does not point against exhaust gas stream. 7. Never switch on the sensor heating control unit before engine start. 8.Delay of sensor heater start or power control of the sensor heater as a function of engine and ambient temperature. 9. Installation angle should be inclined at least 10 degrees towards horizontal (electrical connection upwards). Thus preventing the collection of liquids between sensor housing and sensor element during the cold start phase. Other installation angles must be inspected and tested individually. 10.The use of cleaning/greasing fluids at the sensor plug connection is not permitted. 11. Assembly with special high temperature resistant grease on the screw-in thread is recommended 12. Tightening torque = 40 - 60 Nm, material characteristics and strength must be appropriate. 13. Recommended material for the thread boss in the exhaust pipe: Temperature resistant stainless steel to following standards; DIN 17440 1.4301 or 1.4303, SAE 30304 or 30305 (US). Thread boss dimensions should be as in sketch, note that sensor thread must be covered completely. 14. The sensor must be covered when underseal (wax, tar etc.) or spray oil is applied to the vehicle. 15.The sensor must not be exposed to strong mechanical shocks (e.g. while the sensor is installed). Otherwise the sensor element may crack without visible damage at the sensor housing. 16.Underfloor installation of the sensor remote from the engine requires an additional check of the following points; positioning of the sensor with respect to stone impact hazard; positioning and fixing of cable and connector with respect to mechanical damage, cable bending stress and thermal stress. 17. The sensor should not be exposed to continuous, onesided dripping of water, e.g. by the air-conditioning condensation water outlet. The thermal stress could damage the sensor. Also: Important Note: : It is common practice for these sensors to be used in conjunction with various aftermarket air/fuel ratio measurement devices, not of Bosch design or manufacture. It should be noted that these sensors are more susceptible to damage from thermal shock than the older “Thimble” design sensors, this is mainly due to their much higher operational temperatures. As detailed below, the heater management strategy used for the LSU 4.9 sensor is quite complex and generally vehicle specific. Whilst these sensors are “Universal” in their measurement capabilities, they are not designed to be “Universal” in their installation position. Installation position is critical to prevent moisture settling into the sensor element during shut down; hence the sensor should never be allowed to become inverted during storage. Therefore when using these sensors for temporary air/fuel ratio measurements, i.e. chassis/engine dynamometer testing, the operator should take care to protect the sensor from moisture ingress and physical damage that may create the potential of thermal shock to the sensor element resulting in premature sensor failure.
These instructions are for our WideBand O2 sensors used with Holley EFI stystems. If you have a system with up-stream and down-stream sensors, you should refer to the manufactures instructions for correct placement. thx J
Ensure the location for the sensor is at the angle of at least 10 degrees up from horizontal. This will help prevent condensation in the exhaust tubing from entering the sensor. Look at figure 1 on page 8 of the instructions for a visual look. hers a link to the instructions, documents.holley.com/199r11031r.pdf Thx J
The 02 sensor # is 0258017025 which crosses to the Snipers 02 sensor and you can get a cheaper spare @/17025. Shame on you Holley for trying to bullshit us
this guy should start doing ALL the holley videos...
Best explanation of O2 system functionality I've heard to date... THANK YOU!!
Amazing how this guy diagnosed my problem from a thousand miles away 😚
Same here. This guy is 💯
That was a fantastic overview of adding an O2 sensor-thanks!
Those guys that did the "don't do this header" must've had a good laugh the entire time they put that together. Good video.
Damn good explanation in detail .... in fact one of the best I've ever seen .. well done and thanks ...
Nice video, Information from a Pro .. Wealth of knowledge and said slowly for all to understand. Keep up the great Video's.. Thanks for the info...
Great video I just got my whole exhaust system done on my car and once I got the car home I saw the rear o2 sensors coming out of the side of the catalyc converter is this correct?
Outstanding explanation, excellent presentation. Thanks
shut ur mouth u fat fuck
This guy is fantastic. Great video. Thanks for all the tips.
When installing the wide band o2 sensor, would it be to replace one of the OEM o2 sensors? Or in addition to the OEM sensors?
Clarification please. Between 6-8 inches after the merge would be further down than the video shows. It looks more like 6-8 inches right before the merge and within a few of inches after the true merge collector area. 6-8 inches past right before they merge? The other locations like the clamp on are over one foot past the merge/ collector area. Are these locations this far downstream ok if we have well over 20" after sensor? Great videos. Thank you.
Are only Bosch o2 sensors compatible with Holley Sniper units, or will any other brand work?
can I install the bung using salt-water taffy ??
Sure. Just be sure to put vise grips(WTF! lol) on it to keep it tight.
LOL Dave! ONLY if you mix the taffy with a little JB Weld.
great video and very thorough explanation, thank you :)
That was very informative.
Hey Tom, great video! I've received my "O sensor" without the plastic protector that goes around the metal end, and there's grease all over that end. Do you just wipe it put clean with a piece of cloth, or do you use something else, since that is the part you'll screw in? Thanks in advance for your details, Tom!
Does Holley sell an O2 kit for carb application? where can I find the non-weld bung assly you showed? Thanks for any ones feedback.
I have cut outs on. my GTO. my hotrod shop installed a sniper and o2 sensor goes out after less than 500 miles. on the 3rd one. is this system not compatible with cutouts?
... I think I'm just gonna get me a horse.
@ Gary Kovach, HA HA HA, or a CARBURETOR.
lmaooo
Lmao same ! My 2007 trailblazer ss check engine came om and it shows its a oxygen sensor. Ima just take it to the shop, fuck this lol
@@pacsoulpavon9649 shutup fuckwit u dont know anything about cars
@@fuz1on237
well. arent you just a negative nancy
My 02 is 12" after the position you show as the merge location. would this be enough to cause a no start condition and should I block that off and relocate it.
Great video.
May be a dumb question but I'll ask anyway, if I install a wideband on my vehicle in a location where it's only reading one bank (4 cylinders) of exhaust fumes will that reading be okay for tuning? I would assume what ever reading it's getting will be the same for the other bank of cylinders...
Yes, a sensor on one bank of a dual exhaust is common. The two banks being the same isn't a perfect assumption but it's close enough for most applications. The Holley Dominator ECU has dual O2 inputs so you can run sensors in both banks but other systems like the Sniper only use one sensor and it goes on one bank.
Is there any way to remove the 02 sensor I have a 94 chevy c1500 wanting to put long tube headers
I have a question, how would a cut out affect the sensor?
How does this work when you have side pipes?
I got the bosh equivalent to the one that came with the sniper. Do i have to reprogram it? I dont remember any warning labels that came with it
How about installing in a vertical
Pipe? Will it work?
Install horizonal at a 10 to 15 degree angle pointing upward, so moisture/water can run/drip off.
Thank you, Tom. Would you please include a link to the clamp-style mounting bung?
www.holley.com/search/?q=o2%20bung thx J
Does JB weld not hold then?
What do you do for true duel exhaust?
What about angle of the O2 sensor? I remember people telling me in the past that you have to put it at 45° or something.
The sensor element needs to at least be at a 10 degree angle so moisture will drain off. -Keith
I have stainless Hooker Competition Series LT headers on my SS which are manufactured by Holley Performance products yet I have Insufficient Switching O2 sensor issues ever since swapping my rotten out set of Pacesetter LTs for their product.
I wonder if it's caused by the slip fit into the y-pipe being not fully sealed or the placement of the O2 sensor bungs...
Have you figured out the issue?
Yes, most exhaust mods will cause that or any manipulation of the sensor (most exhausts will move it towards the rear and set it codes).
Best thing to tune them out !
been waiting for decent explanation of this since replacing my exhaust with decat downpipes, now i know where to mount it :) thank you !
Hi,
Regarding the optimum placement for o2 sensors. Where or what do you do when a 2 piece manifold system is replace with a 1 piece manifold (upgrade for turbo install).
My vehicle have 2 upstream and 2 downstream. Where do the upstream ones go??
Together (side by side) right after the new manifold? Or together after the turbo?
Thanks.
You sir are a lifesaver. Exactly what i needed.
If my sensor was ON the catalytic conver, and i bought a converter with no o2 port. Should i put the sensor before, or after the cat? Thank you!
Wondering if you can put exhaust cutout after the O2 sensor or if you still need to have 18 inches to 24 inches of exhaust pipe after the O2 sensor th er n the cutout 🤔
very informative. thanks
How critical is it that the O2 sensor is 8" away from where the header pipes come together? I/m only seeing a little over 4" on my install.
I really like the bad example piece.
Someone had fun making that
Where does the wideband sensor go on a car with a catwhich bolts onto the manifold please?
What about O2 location for a turbocharged engine?
Great info and explanation, THX
Luckily a fouled sensor can be fixed by heating it to cherry red with a propane torch all around and then using a voltmeter to check the response time after that is done. Just connect the voltmeter leads to the two wires that are different colors. The two wires that are the same color are for the heater circuit.
I do wish someone like Holley would develop a listing showing the location of oxygen sensors on cars. I have a 2003 Bentley Arnage T, a classic I purchased, where an )2 sensor filed and I cannot find its location. I came to your video searching for where it might be located. I cannot find old Bentley service manuals and now the Bentley is about to become undriveable because I cannot repair it.
Can this help reduce rich running of a C4 corvette before I wash out a piston ring I can’t find a tuner around my area and it pour black smoke...
Nice video but I would have liked some input on turbo model engines. Post turbo, pre turbo, distance , ext. I ran mine post turbo about 18 inches down and it seems to be fine but I've always wondered what a *pro* would say about that. I personally only have to so I know what my car is doing and running as my car is a daily. I just hate not knowing what my cars oil pressure, a/f ratio, temps, and stats are at.
Why does the O2 sensor have to be so close to the engine ? Why cant it be further back behind a y pipe that reads both banks?
very thorough
I just bought a ram with aftermarket exhaust and the pipes don't meet until near the muffler at the back. Do I still put the sensor at the merge or do I put it near the headers? I don't have cats. The truck sometimes stalls and struggles to run so if you could help me it would be much appreciated.
The position of the O2 sensor should be after the merge of all the cylinders of one bank (ie odd or even side cylinders) not after all cylinders ( both odd and even). Example: After the merge of all 4 collector pipes on the passenger side of ta V8 engine ( cylinders 2,4,6,8). Thx J
After reading the instructions for my Sniper (1" - 10" from the collector)and watching the guy with the yellow 67 SS Camaro install his in the Holley video (1" - 10" from the collector flange) I did what they said. Now it appears that may not be right? I'm crossing my fingers - this is a lot of $$$$!
Good explanation but still a lot uncovered. Make a search on WBO2 sensors and Sniper and you find tons of people having failed sensors. After I did everything right, installed in the right spot, routed wires carefully I found myself now having a failed sensor after less than 2000 miles. First thing that comes up on my mind is to google and improve my location of the sensor. Still cant find any clear path what to do to be sure the problem is addressed. No oil smoke (new heads) and piston rings, no misfire, OK fuel... Maybe can question the EFI cant operate the sensor within its specs??
Wow the best informational video yet , thank you, but I was looking to find out where the male ,& female plug in on a 92 dodge Dakota 3.9 manual transmission, 2 wheel drive ,& also where is the male & female connection for a Crank shaft position sensor, on the same vehicle
Would it be OK to mount an O2 sensor on a H-pipe crossover for a Sniper EFI?
No. The O2 sensor needs to be in the direct path of the exhaust flow. -Keith
@@HolleyPerformance Thanks!
anything special to do when running E85?
So which helper was tasked with making the most oakie engineered exhuast system example...
I have an 07 mustang V6 I'm putting a single turbo setup very soon. It has 4 O2 sensors. Where do I move them to? If anyone can answer?
I installed a cam in my truck.put header but the header it self did not have a hole to put one in.but I do have 2 connected.and my truck would smell like gas.i also have code for my bad o2 sensor.what should I do?only tuning on 2 o2 sensor silverado 08
That exhaust on the left looks like my exhaust system
For the LSU 4.9. Never turn it on with out running the motor ( #7 ). Info can be found in the Bosch's full line product catalog.
Copy and pasted and edited to fit:
General Installation Instructions & Requirements:
In general, the sensor installation point must be tested sufficiently by the customer for function and durability.
1. Installation in the exhaust line must be at a point guaranteeing representative exhaust gas composition whilst also satisfying the specified temperature limits
2.The heater power must always be switched on power controlled, starting with a maximum ramp up nominal voltage as described in the sensor specifications. This is to reduce thermal stress of the sensor element at cold start due to high peak power in the first seconds.
3.The sensor installation location must be selected to minimise exhaust side stressing with condensation water in order to prevent ceramic element cracking.
4.Locate the sensor as close to the engine as possible, respecting maximum allowed temperature range.
5. The exhaust pipe in front of the sensor should not contain any pockets, projections, protrusions, edges, flex-tubes etc. to avoid accumulation of condensation water. A downside slope of the pipe is recommended.
6. Make sure, that the front hole of the double protection tube does not point against exhaust gas stream.
7. Never switch on the sensor heating control unit before engine start.
8.Delay of sensor heater start or power control of the sensor heater as a function of engine and ambient temperature.
9. Installation angle should be inclined at least 10 degrees towards horizontal (electrical connection upwards). Thus preventing the collection of liquids between sensor housing and sensor element during the cold start phase. Other installation angles must be inspected and tested individually.
10.The use of cleaning/greasing fluids at the sensor plug connection is not permitted.
11. Assembly with special high temperature resistant grease on the screw-in thread is recommended
12. Tightening torque = 40 - 60 Nm, material characteristics and strength must be appropriate.
13. Recommended material for the thread boss in the exhaust pipe: Temperature resistant stainless steel to following standards; DIN 17440 1.4301 or 1.4303, SAE 30304 or 30305 (US). Thread boss dimensions should be as in sketch, note that sensor thread must be covered completely.
14. The sensor must be covered when underseal (wax, tar etc.) or spray oil is applied to the vehicle.
15.The sensor must not be exposed to strong mechanical shocks (e.g. while the sensor is installed). Otherwise the sensor element may crack without visible damage at the sensor housing.
16.Underfloor installation of the sensor remote from the engine requires an additional check of the following points; positioning of the sensor with respect to stone impact hazard; positioning and fixing of cable and connector with respect to mechanical damage, cable bending stress and thermal stress.
17. The sensor should not be exposed to continuous, onesided dripping of water, e.g. by the air-conditioning condensation water outlet. The thermal stress could damage the sensor.
Also:
Important Note: : It is common practice for these sensors to be used in conjunction with various aftermarket air/fuel ratio measurement devices, not of Bosch design or manufacture. It should be noted that these sensors are more susceptible to damage from thermal shock than the older “Thimble” design sensors, this is mainly due to their much higher operational temperatures. As detailed below, the heater management strategy used for the LSU 4.9 sensor is quite complex and generally vehicle specific. Whilst these sensors are “Universal” in their measurement capabilities, they are not designed to be “Universal” in their installation position. Installation position is critical to prevent moisture settling into the sensor element during shut down; hence the sensor should never be allowed to become inverted during storage. Therefore when using these sensors for temporary air/fuel ratio measurements, i.e. chassis/engine dynamometer testing, the operator should take care to protect the sensor from moisture ingress and physical damage that may create the potential of thermal shock to the sensor element resulting in premature sensor failure.
Lol - that one pipe with the assortment of "Bubba" tech.
I LOL'd after "It measures unburnt oxygen, not fuel, otherwise it would be called a unburnt fuel sensor"
So where do I put it when I delete the cat and have the exhaust come down right near the end of the trans
had no idea it was that sensitive
How about my downstream sensor placement?
These instructions are for our WideBand O2 sensors used with Holley EFI stystems. If you have a system with up-stream and down-stream sensors, you should refer to the manufactures instructions for correct placement. thx J
thanks tom
If Bob Ross was a car mechanic.
He truly is an artist!
We need info on proper angle to install. Don't you want it to be within an certain degree of vertical? Something about condensation ?
Ensure the location for the sensor is at the angle of at least 10 degrees up from horizontal. This will help prevent condensation in the exhaust
tubing from entering the sensor. Look at figure 1 on page 8 of the instructions for a visual look.
hers a link to the instructions, documents.holley.com/199r11031r.pdf
Thx J
1st of all u can use a carb and a 02 sensor with a gauge and it still works xD
thanks!
I like this video, if your gonna do something, Do it right.
How about a O2 dummy sensor and bypass the all these issues and you could run open headers?
It must have been fun to make that don't do pipe.
if you are running that excessively rich you will smell it and most likely see some black smoke.
The 02 sensor # is 0258017025 which crosses to the Snipers 02 sensor and you can get a cheaper spare @/17025. Shame on you Holley for trying to bullshit us
Or maybe your blow thru and need a AFR to tune with.
Hey what ever works and passes inspection right guys lol
get to the damn point guy
O2 SENSOR WONT SCREW IN WHAT DO I DO?
Contact our technical service department. 866-464-6553 -Keith
Hi, im installing a sniper efi on 289 and it has two split exhausts for each side of the engine, do I have to install two O2 sensors for each side?
Great video thanks