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speedometer off

  1. 9-3 Sedan, Cabrio '04+, Combi, 9-3X Workshop
    I've noticed that my speedometer is off about 5mph compared to a gps. My wife's car is spot on but the Saab is 5mph off - indicating 5mph higher than actual speed. I have checked the tires and they are the right size. What could be causing this? Paul Sent from my iPhone using Tapatalk