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Answerit may be your oxygen sensors

The service light is nothing more than a lamp connected to a 100 hour time delay relay. It's purpose is to remind you to service the engine at regular intervals. Do it when the lamp ios illumenated and reset the time delay relay by pushing a screwdriver or punch or whatall on the rubber grommet to the left and below the speedometer

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Q: Why is the service light coming on then goes off after awhile on my 88 Volvo 740 gle?
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