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2001 Buick Park Avenue Question: Speedometer is reading 20 to 30 mph too fast.
Answer #1mastertech6371 January 16, 2012, 18:44Master
make sure you have the correct tire size on the car.
otherwise, the trans gear inside the governor may be at fault.
Replymstriegl, January 17, 2012, 09:00Rookie
The tires have not been replaced, it just started doing this about 1 week ago. I suspect the speed sensor is failing.