Help with O2 sensors, SES codes won't go away
 

Well i got the trans problem fiured out but now i keep throwin o2 codes. Codes that wold throw very rarely before are now poppin up about every 5 miles. Nothin in my tune has chnged other than a few things transmission related so i don't know wtf?

It keeps giving me these two codes.

PO153-HO2S Slow Response Bank 2 Sensor 1 [old/immature]
P1133-HO2S Insufficent Switching Bank 1 Sensor 1 [SES][OLD][HISTORY][CURRENT][IMMATURE]

Ichecked the tune and like i said the only changes were trans related but now these two codes keep poppin up?

Here's the kicker too i replaced the o2's with front vette o2's from the same year model 2000 silvy 2000 vette.

Oh and this started happening right after i had the tranny replaced. Any chance something got messed up during the removal/instal?
But no luck i keep getting the same crap.
Ideas?

try to reset your PCM and see if that helps out...just disconnect the negative battery terminal for a few minutes and let everything re-learn

guess it's worth a shot.

it wont hurt anything, it just might help, or it wont???
just a quick easy thing to try
if that doesnt help it could be a short in a wire somewhere or a wire could be pinched or something like that maybe

If the wiring checks out OK, there's a chance that you have lazy O2 sensors...are they the original sensors or have they been replaced already? Have you done anything to the truck lately that may affect the O2 sensor readings, like installed long tubes or something?

He just put the vette o2's in but didnt seem to change his issue...sounds like a wiring issue to me something isnt connected or a broken wire somewhere maybe

Oh OK, so the O2's are new...I'd do some logging first and see how the O2's are responding. If they're actually responding slowly and they're new, I'd be looking for a wiring issue that is common to both O2's, maybe an open wire or a ground that isn't connected...

good call! :thumb:

I agree that you most likely have a ground wire that was not connected after the transmission work was complete. Although not as likely, if your transmission was pulled, did you possibly pinch a wire between the bellhousing and block? Good luck.

you have headers? How long have you had the headers if you have them? The trans pull caused you to pull down the ypipe thus messing with o2's that were "happy". If you have headers, the vette o2's aren't always a fix for the heat issue, as a matter of fact I'd guess a 30% chance of making it go away.