Did you notice your gas mileage changing and getting worse? Sometimes this is a indication of O2 sensor going bad!
Gas cap fix. Check that gas cap seal. If dirty, wipe excess scum off and over tighten.
Temp remove the battery cable which will reset the computer. Do this after a fix. Ex. gas cap, then battery cable, re-attach and start car. Notice light or absense of CEL.
Other then that, get some real strong injector cleaner and run this through on a full tank and repeat once more on the second tank. I heard someone say that this helped them with CEL!
Hope this helps!
