Baffled

[Rhcmlc]

I started my '03 Malibu the other day and noticed the engine light on. I drove it around for a while on the street and freeway and didn't notice any performance difference. I've driven it around now for a couple of days, but still haven't noticed any problems. I thought engine lights always came on when a serious mechanical problem occurred. What would cause an engine light to come on while the car still runs fine? Any help is greatly appreciated.

[goofy4467]

check the gas cap if its not tight. it will cause the light to come on (see owners manual)

[igkyoa]

or it could be the o2 sensor or something which is only for emmission control

[bcopeland]

Most likely it is the gas cap. Go to an auto parts house (like AutoZone) and they will read the code for free.