replace the sensor which is usually in the rear diffrential or the transmission case
You have to replace the instrument cluster in most cases.
May have to take it to a certified speedometer repair shop
You might have to take the car to a certified speedometer repair shop
I'd suggest you take the car to a speedometer repair specialist. They can remove, repair and calibrate the spedometer.
A 2004 Buick does not have a speedometer cable. The speedometer signal comes from electronic sensors.
You can fix the speedometer in your 1994 Oldsmobile 98 by replacing the speedometer cable. If changing the speedometer cable does not fix your speedometer you will need to replace the entire speedometer.
what exactly is wrong?
Speedometer cables can dry out over time. Remove the cable from the back of the speedometer, and lube the cable with graphite. This should fix the issue.
Check your fuses before anything else. Easiest and cheapest fix.
Unhook both sides of battery and wait 1 minute, this will reset reset the computer to default.
The contacts between the speedometer head and the wiring connector need to be cleaned. If that does not work get a used speedometer. It fixed mine.
how to fix speedometer for Toyota mr2