Hey guys im trying to pass my emissions and keep failing i have a greddy emanage blue for my comptech supercharged 2002 s2k. It keeps throwing the 2nd 02 sensor code. i had a tp on it before and went back to the cat for the emissions and put a antifoler on it to but its still throwing a cel and wont pass any suggestions
thanks

 

is the o2 sensor good? when i was n/a with a tp, i still passed no problem.

 

If you're running a cat, you shouldn't need the antifowler between the o2 sensor and cat converter.