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Speedometer is reading 20 to 30 mph too fast.

(2001 Buick Park Avenue)
in Kingfisher, OK on January 16, 2012
I am ASE mechanic as side job.
Displaying 1 answers & 1 comments
Popular Answer
on January 16, 2012
make sure you have the correct tire size on the car.

otherwise, the trans gear inside the governor may be at fault.

on January 17, 2012
The tires have not been replaced, it just started doing this about 1 week ago. I suspect the speed sensor is failing.
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