Question about 1997 Mercury Grand Marquis

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Over drive light flashes and will not go into overdrive

Car has been sitting around for quite a while also heater vent will not work

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  • nuttbysteve Jan 09, 2009

    Thank-you for answering and i'll give it a try!

  • Anonymous Jan 17, 2009

    over drive light flashing

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  • Mercury Master
  • 4,369 Answers

If the o/d light is flashing, you may have a bad speed sensor. The speed sensor tells the computer how fast the car is going. A scan with a scan ool will give a code that will tell you if it's a bad speed sensor. Some auto stores will scan for free if you buy part from them.

Posted on Jan 09, 2009

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Posted on Jan 02, 2017

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