I notice that my service engine light comes on from time to time. It is mainly when i have my heat on. Everytime i take my car to have it tested, nothing shows up on the computer. It is driving me crazy becuase i hate that yellow light. Please let me know any recomendations or advice that might help me find the problem.
Thanks

I have the same problem. I've had it checked out by three different mechanics since I've had the car. (18 months) They can't find anything. Mine seems to come on during initial braking. I've had my pads changed since then and the problem remains.

On a 93, your braking system doesn't talk to the PCM. Not sure about a 94. Look specifically at the drivetrain and associated sensors, no brakes.

Great News! My grandfather found my problem. The large nut that holds my hub and everything to the car was only on by two threads. The only thing keeping the wheel on my car was my brake caliper. :( it wore my pads almost completely off. Amazingly no damage was done to my ABS, my bearings, or my rotors.He tightened the bolt and now i have no more light problems. Anyone who is having this problem needs to check that out.