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Q: Speedometer is reading 20 to 30 mph too fast. on 2001 Buick Park Avenue

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I am ASE mechanic as side job.
make sure you have the correct tire size on the car.

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

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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