How do you reset an Oldsmobile computer?

If you have a car made after 1996 your Olds has an ODB-2 (also OBD-II) computer. The error codes stored in this computer must be cleared with a code reader or an ODB-II Scanner. If you have an older car, made before 1996 you have an ODB-I computer. The ODB-I can be cleared by removing both IGN (ignition) fuses for at least 2 minutes. You can also disconnect the negative terminal from the battery if you can't find the fuses (GM often put the ECM and related fuses under the hood).

I recommend that you first "read" the stored error codes. ODB-II is much easier and can be done with a hand-held scanner. Many auto parts stores have one that they will let you use if you can get your car to their parking lot. ODB-I codes can be read by SOME readers with proper adapters. Or you can stick a jumper wire into connector A to B and count the flashes. A $25 repair manual will tell you what the codes mean and make recommendations on how to fix them. But don't assume that an error code is all the diagnostic you need. An oxygen sensor might wear out after 100-150,000 miles, but if the oxygen sensor "goes bad" sooner than that you have a symptom not a cause.