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1990 Mercedes-Benz 420SEL Question: What would cause the speedometer to not accurately display MPH?

 

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Visitor, Rancho Cucamonga, CA, March 29, 2010, 21:03

Example: If I am going 25 MPH (as shown on speedometer) my actual speed is approximately 45 MPH. What is causing this to occur?

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    Jim Taddei April 02, 2010, 15:19
     Master

    It sounds like the speedometer on your 1990 Mercedes 420SEL is reading in kilometers per hour instead of miles per hour. If there a switch located some where on the dash to convert the reading from metric back to english units?

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  • Answer #2

    Visitor, April 02, 2010, 21:52

    Thank you Jim,
    I do not see any switch that can be set to kilometers or miles (unfortunately). I may scan the trans to see if the sensor that is in there is for K instead of M. Thank you for the advise.

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