Need help codes after header install
Thread Starter
Intermediate
Joined: Jun 2010
Posts: 26
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From: Raymore MO
Need help codes after header install
Installed some new OBX long tubes on my 01Z, after the install I'm getting codes P0134 and P0154, i checked for leaks and don't see any (there was one after the install but its gone now and the odes have been cleared and since come back) do I need some special O2 sensor
Much appreciated
Much appreciated
Thread Starter
Intermediate
Joined: Jun 2010
Posts: 26
Likes: 0
From: Raymore MO
I dont believe they are reversed, but can double check again, there isn't a chatted x pipe but the header do have bungs for rear O2 sensors which have been blocked off to prevent leaks and the rear O2s have been programmed out
Racer
Joined: Mar 2013
Posts: 325
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Those are front o2 sensor codes.
You need to have front o2 sensors installed, otherwise your car will not run properly. Modern cars use the front o2 sensors to determine proper A/F ratio.
You were supposed to extend the front o2 sensors to where you blocked off the bung on the header and just leave out the rear o2 sensors.
You need to have front o2 sensors installed, otherwise your car will not run properly. Modern cars use the front o2 sensors to determine proper A/F ratio.
You were supposed to extend the front o2 sensors to where you blocked off the bung on the header and just leave out the rear o2 sensors.
Safety Car
Joined: Aug 2011
Posts: 4,436
Likes: 403
From: Portland OR
Both codes are front O2 sensor insufficient activity.
You really can't cross the fronts.
New sensors or the originals?
If original, I'd try new GM parts and see what happens. Amazon has good prices. GM switched designs and they should be faster reacting.
Ron
You really can't cross the fronts.
New sensors or the originals?
If original, I'd try new GM parts and see what happens. Amazon has good prices. GM switched designs and they should be faster reacting.
Ron
Team Owner
Joined: Mar 2002
Posts: 24,160
Likes: 78
You're getting insufficient activity codes from the front sensors because they're running too cold now. The stock placement of the front sensors on the exhaust manifold has them much closer to the exhaust ports. When you move them downstream to the collector, they don't get hot enough.
The solution is to run the rear type of 02 sensor in the front bungs because the rears have a stronger internal heater. This will require a wiring conversion harness.
P0134 Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 1 Sensor 1-A
P0154 Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 2 Sensor 1-A
The solution is to run the rear type of 02 sensor in the front bungs because the rears have a stronger internal heater. This will require a wiring conversion harness.
P0134 Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 1 Sensor 1-A
P0154 Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 2 Sensor 1-A
Last edited by wcsinx; Jul 23, 2013 at 11:02 AM.
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Racer
Joined: Mar 2013
Posts: 325
Likes: 0
You're getting insufficient activity codes from the front sensors because they're running too cold now. The stock placement of the front sensors on the exhaust manifold has them much closer to the exhaust ports. When you move them downstream to the collector, they don't get hot enough.
The solution is to run the rear type of 02 sensor in the front bungs because the rears have a stronger internal heater. This will require a wiring conversion harness.
P0134 Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 1 Sensor 1-A
P0154 Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 2 Sensor 1-A
The solution is to run the rear type of 02 sensor in the front bungs because the rears have a stronger internal heater. This will require a wiring conversion harness.
P0134 Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 1 Sensor 1-A
P0154 Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 2 Sensor 1-A
For him to have them both show dead when several cars including my own have no problems with the fronts extended makes me think they aren't plugged in or were soldered incorrectly instead of extended with a harness rather than not heating up properly.
Team Owner
Joined: Mar 2002
Posts: 24,160
Likes: 78
For him to have them both show dead when several cars including my own have no problems with the fronts extended makes me think they aren't plugged in or were soldered incorrectly instead of extended with a harness rather than not heating up properly.
Racer
Joined: Mar 2013
Posts: 325
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I'm not sure where you pulled your line definition from, or if there are even two codes that distinguish between no/low voltage for front o2s within the general OBD-II trouble codes themselves, but that site is what I usually go off of.
Last edited by hamhead; Jul 23, 2013 at 01:14 PM.
Team Owner
Joined: Mar 2002
Posts: 24,160
Likes: 78
Going off the OBD website, it states this code means no activity. Same for the other.
I'm not sure where you pulled your line definition from, or if there are even two codes that distinguish between no/low voltage for front o2s within the general OBD-II trouble codes themselves, but that site is what I usually go off of.
I'm not sure where you pulled your line definition from, or if there are even two codes that distinguish between no/low voltage for front o2s within the general OBD-II trouble codes themselves, but that site is what I usually go off of.
Though interestingly enough, I see slow response codes as well, so maybe GM is redefining "insufficient".
But I still maintain that running them cold could cause this code to get thrown. first sentence of the diagnostic procedure from your link...
"First start the engine and bring it up to operating temperature and ensure the engine reaches closed loop."
Racer
Joined: Mar 2013
Posts: 325
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From the service manual
Though interestingly enough, I see slow response codes as well, so maybe GM is redefining "insufficient". But I still maintain that running them cold could cause this code to get thrown.
first sentence of the diagnostic procedure from your link...
"First start the engine and bring it up to operating temperature and ensure the engine reaches closed loop."
Though interestingly enough, I see slow response codes as well, so maybe GM is redefining "insufficient".
But I still maintain that running them cold could cause this code to get thrown. first sentence of the diagnostic procedure from your link...
"First start the engine and bring it up to operating temperature and ensure the engine reaches closed loop."
Best to wait for OP. If he has them plugged in and installed correctly, chances are they both didn't coincidentally "go bad" at the same time and he should use the rear sensors.
Cheaper that way too - just have to buy the adaptor harnesses for $20 each rather than forking out $60 each on new sensors.
Team Owner
Joined: Mar 2002
Posts: 24,160
Likes: 78
I don't disagree.
Best to wait for OP. If he has them plugged in and installed correctly, chances are they both didn't coincidentally "go bad" at the same time and he should use the rear sensors.
Cheaper that way too - just have to buy the adaptor harnesses for $20 each rather than forking out $60 each on new sensors.
Best to wait for OP. If he has them plugged in and installed correctly, chances are they both didn't coincidentally "go bad" at the same time and he should use the rear sensors.
Cheaper that way too - just have to buy the adaptor harnesses for $20 each rather than forking out $60 each on new sensors.
Safety Car
Joined: Aug 2011
Posts: 4,436
Likes: 403
From: Portland OR
Wouldn't you think it would be wise to have his tuner just look at the activity? It's easy with the tuning software. You get a graphical representation of the switching.
To me, insifficient activity isn't the same as no activity. Hard to say how the GM software defines it.
I would also wonder if the car is ever going closed loop? Also easy to see with the software. I would guess that at other than idle, it is, but I don't have the car in front of me to look see.
As far as the rears having stronger heaters, I measured heater current for both front and rear sensors from my car and they draw identical current at 12v supply, I believe the heaters are the same.
Would be nice to see a photo of the OBX headers and see just how long they are. I run XS Power headers (same length as AR) with the new design O2 sensors and have no issues.
By the way, the later style O2 sensors are planar style (they heat easier) as opposed to the thimble style of the earlier ones. Planar and Thimble refer to the ceramic substrate material inside the sensor.
Ron
To me, insifficient activity isn't the same as no activity. Hard to say how the GM software defines it.
I would also wonder if the car is ever going closed loop? Also easy to see with the software. I would guess that at other than idle, it is, but I don't have the car in front of me to look see.
As far as the rears having stronger heaters, I measured heater current for both front and rear sensors from my car and they draw identical current at 12v supply, I believe the heaters are the same.
Would be nice to see a photo of the OBX headers and see just how long they are. I run XS Power headers (same length as AR) with the new design O2 sensors and have no issues.
By the way, the later style O2 sensors are planar style (they heat easier) as opposed to the thimble style of the earlier ones. Planar and Thimble refer to the ceramic substrate material inside the sensor.
Ron
Team Owner
Joined: Mar 2002
Posts: 24,160
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http://www.lgmotorsports.com/gallery...structions.pdf
The early cars have a weak heater in their front sensors. We have found best results to use the rear sensors in the front location by using the supplied adapter harness. Rear sensors should be removed inside the computer or a new set of rear sensors should be used in the rear location.
Safety Car
Joined: Aug 2011
Posts: 4,436
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From: Portland OR
I don't know if the various years used different sensors. I have never heard that they do.
Burning Brakes
Joined: Jul 2006
Posts: 968
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From: Regina Sask
Those are very common codes when LT Headers are installed. Just set them to no error reported & uncheck the ses box. Also you will likely also get codes P0133, P0153, P1133, P1153, P1134 and P1154. Just delete them as well.
Russ Kemp
Russ Kemp