bat711

Changed out the differential fluid, engine air filter, and cabin air filter. Put everything away and started the car up to put it away and the engine light didn't turn off as normal. The engine air filter was very dirty, is it possible that the new filter has so much more air flow that the ECU isn't used to it yet? I don't think any of the other things could trip the light, correct?

Thanks

skibum

Did you unplug any sensors that you did not reconnect? Might have to go to a local auto part store and get a free scan.

Slows2k

Must get code 1st.

bat711

No sensors disconnected, might take it to Autozone for a scan. The cabin filter and differential don't have any sensors, right?

Slows2k

no

bat711

Got it scanned, the guy turned it off and wouldn't show it to me but said it was a bank 1 sensor 2 O2 sensor. He thought it was code P0138 but turned it off before he could tell me. Not sure how this could be caused with the work I did, but is this one safe to "clear" it and see if it comes back? Car starts, idles, and operates normally.

bat711

Just went and turned it on again and the light was off. So 4 starts later it seems the voltage is back in spec.

CFactor

I would be mad if the guy just deleted the code and didnt tell you EXACTLY what it was. Just wait to see if it comes on again, if it was an 02 sensor I would definitely expect it to come on again if it was bad.

bat711

He didn't delete / clear the code. Just got the code read part of the description and pulled it off before I could even ask him what the specific number was. Guess he was in a hurry to get back inside and sit behind the counter. Anyways I drove a few miles back home, parked in the driveway for an hour and then when I went to pull it into the garage the light was already cleared. P0138 / bank 1 sensor 2 high voltage was the code. Not sure what could cause this I was doing any electrical work or working around the cats at all.

R3DS2K

MIL Is On With DTC P1172 or P2AOO

(Supersedes 07-006, dated January 27, 2007, to update the information marked with the black bar)

SYMPTOM

The MIL is on with PGM-FI DTC P1172 (air fuel sensor [sensor 1] circuit out of range, high) and/or P2A00 (air fuel sensor [sensor 1] circuit range/performance problem).

PROBABLE CAUSE

The air/fuel sensor is damaged by moisture in the exhaust system during engine warm up.

REPAIR PROCEDURE
1. Update the PGM-FI software in the ECM/PCM. Refer to Service Bulletin 01-023, Updating Control Units/Modules.

2. Replace the air/fuel sensor:


maybe this??