2003 Chevrolet S10 Q&A

2003 Chevrolet S10 Question: Check engine light on. O2 sensor problem. Loud rattling noise.

My check engine light came on and I took it to an auto parts store. They said it was an o2 sensor. The truck makes a loud rattle underneath.Its louder with the a/c on. Could this be my catalytic converter? -
Answer 1
Yep,time to replace the cat,with OE.style and the downstream O2. -