Oxygen sensor codes
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,364
Likes: 1
From: Rugby North Dakota
Oxygen sensor codes
Quick question, I don't think its a big deal:
Added AFR 205 heads, G5X3 cam, Shaner Ported TB, Vararam Intake and had been running (still am running) Dynatech LT's w/ high flow cats
- car has been bench tuned, awaiting dyno and #'s
I'm getting the following codes:
P0135 C - this is a O2 sensor circuit bank 1, Sensor 1-B
P0155C - this is a O2 sensor slow response bank 2, sensor 1A
P1153C - this is )2 sensor, insufficient switching, bank 2, sensore 1B
I'm assuming these codes simply need to be deleted when it is dyno'd - correct? Till then, is there anything I should check for to clear/correct whatever is causing these codes?
Added AFR 205 heads, G5X3 cam, Shaner Ported TB, Vararam Intake and had been running (still am running) Dynatech LT's w/ high flow cats
- car has been bench tuned, awaiting dyno and #'s
I'm getting the following codes:
P0135 C - this is a O2 sensor circuit bank 1, Sensor 1-B
P0155C - this is a O2 sensor slow response bank 2, sensor 1A
P1153C - this is )2 sensor, insufficient switching, bank 2, sensore 1B
I'm assuming these codes simply need to be deleted when it is dyno'd - correct? Till then, is there anything I should check for to clear/correct whatever is causing these codes?
Drifting
Joined: Jul 2005
Posts: 1,533
Likes: 0
From: az
Quick question, I don't think its a big deal:
Added AFR 205 heads, G5X3 cam, Shaner Ported TB, Vararam Intake and had been running (still am running) Dynatech LT's w/ high flow cats
- car has been bench tuned, awaiting dyno and #'s
I'm getting the following codes:
P0135 C - this is a O2 sensor circuit bank 1, Sensor 1-B
P0155C - this is a O2 sensor slow response bank 2, sensor 1A
P1153C - this is )2 sensor, insufficient switching, bank 2, sensore 1B
I'm assuming these codes simply need to be deleted when it is dyno'd - correct? Till then, is there anything I should check for to clear/correct whatever is causing these codes?
Added AFR 205 heads, G5X3 cam, Shaner Ported TB, Vararam Intake and had been running (still am running) Dynatech LT's w/ high flow cats
- car has been bench tuned, awaiting dyno and #'s
I'm getting the following codes:
P0135 C - this is a O2 sensor circuit bank 1, Sensor 1-B
P0155C - this is a O2 sensor slow response bank 2, sensor 1A
P1153C - this is )2 sensor, insufficient switching, bank 2, sensore 1B
I'm assuming these codes simply need to be deleted when it is dyno'd - correct? Till then, is there anything I should check for to clear/correct whatever is causing these codes?
Melting Slicks
Joined: Jul 2004
Posts: 2,826
Likes: 39
From: Central NJ
St. Jude Donor '05-'06-'08-'10
Check your 15amp O2 sensor fuse. You may need to replace the front O2's. I was haunted by these codes after a header/cam swap, but they're gone now. Good luck.
Le Mans Master
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From: Slave to the evil empire
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St. Jude Donor '04
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,364
Likes: 1
From: Rugby North Dakota
GOOD info, THANKS!! -
First, I'll check the 15 amp fuse - any idea which fuse # this is? Is this fuse in the footwell or engine compartment?
2nd, these would be the FRONT 2 O2 sensors, correct?
3rd - if it isn't a blown fuse, I assume that means I need new O2 sensors? Anyway of testing an O2 sensor to see if it is bad or not?
4th - IF I need new O2 sensors, should these be replaced BEFORE I have the car dyno tuned? I ask this cause I'm wondering if there is something in the current Air / Fuel ratio that would have caused these O2 sensors to go bad?
First, I'll check the 15 amp fuse - any idea which fuse # this is? Is this fuse in the footwell or engine compartment?
2nd, these would be the FRONT 2 O2 sensors, correct?
3rd - if it isn't a blown fuse, I assume that means I need new O2 sensors? Anyway of testing an O2 sensor to see if it is bad or not?
4th - IF I need new O2 sensors, should these be replaced BEFORE I have the car dyno tuned? I ask this cause I'm wondering if there is something in the current Air / Fuel ratio that would have caused these O2 sensors to go bad?
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,364
Likes: 1
From: Rugby North Dakota
What did you do to correct your problem after your H/C swap? I could be in the same boat cause I just swapped my heads and cam.
Drifting
Joined: Jul 2005
Posts: 1,533
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From: az
yes, pre cat = front o2s.
yes, you would want them replace before the tune, or your afr could be off for sure on the street tune part.
Le Mans Master
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From: Slave to the evil empire
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St. Jude Donor '04
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Thread Starter
Melting Slicks
Joined: Mar 2005
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From: Rugby North Dakota
UPDATE: I've cleared my codes a couple times, and I KEEP getting the P0135 C and the P0155 C codes intermittently - there does NOT seem to be a set pattern to when the codes appear - I can clear them, run it for a week or so, then these 2 codes re-appear
So my question is:
1. are my O2 sensors going bad and I need to replace them
2. is my car simply running TOO RICH thereby setting these codes off
3. is there some other reason these codes keep happening?
I don't think that I have any burned wires from the 02 sensors, but is it possible that the O2 sensor wires are simply getting TOO HOT and causing these codes? - the wires do not have heat reflective (Firesleeve, etc) material around them
TIA 
So my question is:
1. are my O2 sensors going bad and I need to replace them
2. is my car simply running TOO RICH thereby setting these codes off
3. is there some other reason these codes keep happening?
I don't think that I have any burned wires from the 02 sensors, but is it possible that the O2 sensor wires are simply getting TOO HOT and causing these codes? - the wires do not have heat reflective (Firesleeve, etc) material around them
TIA
Le Mans Master
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From: Slave to the evil empire
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St. Jude Donor '04
How long since you added the heads and cam before the codes popped up?
How intermittant are they, if you reset the codes do they stay away for a couple of days?
How intermittant are they, if you reset the codes do they stay away for a couple of days?
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,364
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From: Rugby North Dakota
RE: the intermittent frequency - the P0135 C and P0155 C codes have been appearing about every 4 - 6 days I'd estimate; I cleared them last week sometime, and I did NOT get any codes until last night 5-30-2007 - I expect that I will be able to drive the car until probably Tuesday or Wednesday of next week before the codes appear again - I'll watch and post here the next time the codes appear
What are your thoughts given the above info???
BIG THANKS
Instructor
Joined: Oct 2006
Posts: 241
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From: COLUMBIA STATION OHIO
Before you go any further.....make sure the front oxygen sensor wires are not switched from side to side. The front ones go to the harness on the same side....the rear ones cross. It took me months to figure this out after I had a clutch installed by a local Corvette guy. He must have switched the wiring when he removed the headers. The codes kept coming up intermittently, and the car ran like crap intermittently.
Thread Starter
Melting Slicks
Joined: Mar 2005
Posts: 2,364
Likes: 1
From: Rugby North Dakota
Before you go any further.....make sure the front oxygen sensor wires are not switched from side to side. The front ones go to the harness on the same side....the rear ones cross. It took me months to figure this out after I had a clutch installed by a local Corvette guy. He must have switched the wiring when he removed the headers. The codes kept coming up intermittently, and the car ran like crap intermittently.
Le Mans Master
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From: Slave to the evil empire
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St. Jude Donor '04
It sounds like your tune is off, get a good dyno tune and you should be alright.
BTW It would be easy to swap the rear O2 sensors but I think it would be impossible to swap the front sensors.
BTW It would be easy to swap the rear O2 sensors but I think it would be impossible to swap the front sensors.
Instructor
Joined: Oct 2006
Posts: 241
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From: COLUMBIA STATION OHIO
No... I have to disagree...the front sensors are so close, I can see how they could easily be swapped. What does it tell you if an experinced and pretty reputable Corvette shop did it? Really, the only way I found the problem was on this forum. Another member replaced headers and his car had exactly the same symptoms as mine. Running way too rich....error codes....and one bank of plugs black with carbon while the other bank was normal. Someone jumped in and said it sounded like the front o2 sensors were swapped. Sure enough...that was the problem.
Le Mans Master
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From: Slave to the evil empire
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St. Jude Donor '04
No... I have to disagree...the front sensors are so close, I can see how they could easily be swapped. What does it tell you if an experinced and pretty reputable Corvette shop did it? Really, the only way I found the problem was on this forum. Another member replaced headers and his car had exactly the same symptoms as mine. Running way too rich....error codes....and one bank of plugs black with carbon while the other bank was normal. Someone jumped in and said it sounded like the front o2 sensors were swapped. Sure enough...that was the problem.
And also try to stretch the left plug all the way over to the right side???