Volvo 940 Forum : “How do I reset the "Service" Light on the dash?”

you have to have a tool too hook up to the vehicle

is it an oil light, or an engine light?

Pull out the fuse for the engine management. Fuse nr1.That should reset your engine light.

There should be a hole by the speedo covered by a rubber cap. Gently remove the cap and use a toothpick to press the button beneath it....