There is some king of reset button under a rubber plug in the face of the instrument cluster a little to the left of center. Can someone please tell me what this does and how it works (engine on or off, etc.)?? It akes a pointed object to get in there to push it. Thanks.

Does a 2003 S80 have the same plug location?

On my 940, this plug covers the "service engine" reset switch. The service engine light will come on as a reminder to do oil changes, etc. The light will illuminate for the first minute or two each time you start the car. After servicing the engine, pull out this plug and push the switch behind it with a small probe of some sort. Note this is not the same as the "check engine" light which comes on when the computer has identified a problem with the engine.

It's the same on the S90 and some 960's (1995 and up.) It comes on every 10,000 miles to remind you of service. It can be pushed with the engine off.

DEWFPO
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1998 S90 068,300 and 1995 964 152,300