Most often when a "Check Engine" light isn't functioning properly or a scan tool won't link up with the computer, it's usually the fuse. So check this first. And remember, just because the fuse looks good doesn't mean it is. Test it with a DVOM.
If the fuse checks out, the look at the bulb in the dash that lights the "Check Engine" light. If the bulb is good, the move on to the wiring/connectors.
Thursday, April 22nd, 2010 AT 11:02 PM