So i ripped my muffler off in the woods i now and just at the flange of the cat this am my check engine light came on driving to work it was cold out what are the chances of it just being an o2 sensor all helps appreciated

 

Punctuation, dude! Did you rip an o2 sensor off? Also, get a code reader on it.

 

No sensors are all there the light just came one could it be because of back pressure

 

No it wont come on cause back pressure.. wat year is your jeep

 

2001 cherokee sport

 

O2 sensor heater can be bad it will throw a code