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Home >> Mercury >> 1999 >> Grand Marquis V8-4.6L VIN W >> Repair and Diagnosis >> Powertrain Management >> Transmission Control Systems >> Lamps and Indicators - Transmission and Drivetrain >> Lamps and Indicators - A/T >> Overdrive Indicator Lamp >> Description and Operation >> Electronic

Electronic

The OVERDRIVE OFF warning indicator has dual functions. The OVERDRIVE OFF warning indicator illuminates when the overdrive is turned off. The OVERDRIVE OFF warning indicator will also flash if a fault is detected in the automatic transmission.
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