My 2003 Cavalier check engine light came on, took it to my local mechanic who said the canister purge valve solenoid was bad. It needed a inspection so the code had to be fixed.He replaced it, the check engine light went out. The next day the light came back on. Any input on why the light came back on?

 

can't say without knowing what code was originally set and what code is set now. provide that information