Why would the service engine light come on in a 2001 Saturn SC2?
the service engine light can come on for a number of reasons.
mainly something has failed, or fallen out of normal perameters.
Most local parts stores, Autozone, Advance auto, Checker, offer
free computer scans. 90% of the time the clerk can tell you exactly
what you need, and how to fix the problem. the other 10% of the
time its out of their hands, or beyond their knowledge. if the
clerk does not give you a good enough answer, repost a question
with the engine code or codes that the scanner picked up.