P0135, P0155? Why?

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Mar 1, 2011 | 08:06 AM

02 Camaro

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P0135, P0155? Why?

i just did a full exhaust on my 02 z28 and it has been throwing o2 sensor codes ever since... the codes are from bank 1 sensor 1 and Bank 2 sensor 1... If you know why it would be throwing these codes please post up.

Mar 2, 2011 | 10:58 AM

wssix99

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Are your O2 sensors properly connected? What did you do with the O2 sensors when the exhaust was changed out?

Did you do the work or did someone else do it?

Mar 3, 2011 | 08:05 AM

senicalj4579

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Those are heater malfunction codes. I got those after running LTS also. In my case the o2s went bad. Take your rear o2s and put them in the front, reset the codes, and see what happens.

Mar 3, 2011 | 08:25 AM

02 Camaro

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Well i just put LT's on so im guessing they might have gone bad

Mar 4, 2011 | 08:10 AM

wssix99

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Quote:

Originally Posted by senicalj4579

Those are heater malfunction codes. I got those after running LTS also. In my case the o2s went bad. Take your rear o2s and put them in the front, reset the codes, and see what happens.

If you do this, don't forget to put anti-sieze compound on the threads before you install them.

If you had someone else put on your LT's, they probably messed something up. Its odd that the sensors would just go bad on both sides after someone had to reinstall them.

Mar 4, 2011 | 08:18 AM

senicalj4579

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Quote:

Originally Posted by wssix99

Anti sieze is good practice but iv never used it on any o2s in any 3 ls1 cars iv had.
These are heater malfunction codes and they most likely need to be replaced.
Oh and fwiw mine went bad almost right after my lt install.
OP just swap the o2s and run the car. See if the codes come back

Mar 5, 2011 | 07:53 AM

wssix99

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New O2s all come with anti-size on them from the factory. Since it burns off after the install, you need to re-apply when re-installing to be sure to prevent the threads from fusing.

I had a dealer pop one out and not use anti-size compound and the thing fused. Recovering from that was a hell worse than I can describe...