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Take the car to a dealer.

The OIL light is not simply hooked to a presuure switch as in older, simpler cars. The oil pressure sensor sends signals to the Triple Meter where oil pressure is displayed. The Triple Meter communicates by a serial link to the Unified Meter and AC Amp, which in turn communicates by another serial link with the main instrument display. A microprocessor in the main display turns the OIL light on or off. If your oil pressure gauge reads normally, the problem is somewhere between the Tripple Meter and the main instrument display.

karlh
 
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