Check engine light mystery

[Anker]

It could be the catalytic converter is shot.

Also, there are two O2 sensors on each side. You should replace both.

What are the specific codes?

[dghii]

Originally Posted by Anker

It could be the catalytic converter is shot.

Also, there are two O2 sensors on each side. You should replace both.

What are the specific codes?

You don’t have to replace both. OBD codes will tell you which sensor network has an issue. Agree with PW. You most likely have a wiring issue. Other possibilities include too much anti-seize on last O2 install...did some get on the sensor?