Read the codes for the Check Engine light and the service light and turn them off! Go here for the info
http://kinovolvo.cjb.net/
And look under Useful Information...it's all there. I printed these pages out and kept them in the glove box until I sold my '94 850.
Make sure you practice the "button pushing sequence," as you have to do them quickly and without mistake. If you end up with some "check engine codes," list them here (it's the number of times the lights blink in sequence, with a pause between the 3 digit numbers) and we'll try to help you identify what the problem is, if any. Guess that's about all.
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