What makes the Check Engine light come on in a 1996 Saab 900S?

Answer 1

Whether in a Saab or any car, the CHECK ENGINE light is an indication that something has gone out of spec. It is most often something in the emisisons system. A code is stored in the car's on-board computer and needs to be read with a diagnostic computer. Once the problem has been diagnosed, the technician can proceed with repair. Saab generally uses a proprietary computer system, so only Saab dealers have the proper diagnostic computer. Some independent Saab shops have purchased used computers from Saab dealers and may be able to help. == == the check engine light will come on as a function of mileage since the last time it was reset. I don't remember >exactly< how to reset it so it doesn't come on each time you start the engine, but I do remember it has to do with using the "clear" button on the SID. I think you hold the clear button down, and after 4 or 8 seconds it will change it's mode and display...but keep holding it down and a few seconds later it will actually clear and reset the 'check engine' light. Sorry I don't remember what mode the SID display should be in to start the clearing process. (I just bought a 1996 SAAB 900 convertible a few months ago...had the check engine light start coming on, did some web searches and came up with this solution...which I partially remember. :{)