Cadillac Owners Forum banner

Check engine light, whats going on?

653 Views 3 Replies 4 Participants Last post by  mattt0305
Hey everyone-

Just to preface, I have searched the forum and there are quite a few topics on this, but didnt find anything to quell my nerves.

Last Saturday, my check engine light came on while driving down the interstate. Not knowing what was going on, I found the nearest pep-boys just to make sure my car wasnt about to fall apart.

They checked the codes and it was giving a duplicated : P0036

I know that the code involves the sensors in the exhaust so Im looking to you guys to tell me what you think it is.

Just some background on the car: 2005 CTS 3.6 w/ 98500 miles. I also got a muffler/res delete back in december.

Thanks guys!
1 - 1 of 4 Posts
Oxygen Bank 1 Sensor 2, passenger side after cat if I remember correctly. You can probably do this yourself, not too hard. I recommend snipping off the O2 sensor wire and using a deep socket to crank them off as opposed to using the O2 socket kit. Running the car for a bit and letting the exhaust pipes heat up can really help to loosen them up too. Careful not to burn yourself though.
  • Like
Reactions: 1
1 - 1 of 4 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.