my CEL came on today and went to get it checked out. It came up P0141, i believe this is the Heater 02 sensor. The guy asked me if i had any exhaust done, but it's all stock. Any reason why this would happen on a stock exhaust?? Its still under warranty so i'm not upset at it at all, just wondering why this would happen? thanks guys. Oh yeah ti's a 2004 cavalier

hope you didnt do anything to the engine sometimes they will use anything for an excuse to void the warrenty

no nothing was done to the engine, i have a cheap ebay intake on there now, i will just put my stock back on when i take it to the dealer. I took it to a local shop for them to scan. Anyone else know?

The heating circuit for the O2 sensor could have went bad.





You can't outrun the radio.

DTC P0141 HO2S Heater Performance Bank 1 Sensor 2

Yup... second O2 sensor, heater not "up to snuff". Check the fuse first, then diagnose further... could be bad. Get under the car and take a look, maybe you snagged a wire on something... ?

yeah that's what it was. Car was under warranty so they just replaced the sensor. Good to go now