So I've got a P0138 CEL, My rear o2 sensor is FUBAR due to my own stupidity, does anyone know the part # for that lil fella? I've looked around for it but had no luck.

Also I'm trifecta tuned with a catless.

-Alex

 

'08 Cobalt Rear 02 sensor P/N 12616506

 

in for story

 

Dude you need to tell us what happened now... before we start bad rumors about you or make horrible guesses. I'm going with over tightening it with the install of the catless DP

 

My guess: Forgot to reinstall; ran it over.

 

or accidentally smacked it on the ground too many times.

 

I say he twisted it when uninstalling/installing instead of unhooking it at the connector.