Speedometer not working
The first thing you can always do is check your fuses. there might a blown fuse that need replacement.The 1990 Legacy has a mechanical speedometer . The speed sensor is a read switch in the speedometer head itself. So
if your speedometer is functioning ( needle working properly ) then the
internal read switch is defective. That requires replacing the entire
speedometer OR it can be a defective connection between the speedometer and the
ECU.If the speedometer is not working, then you can
have a defective speedometer, cable, speedometer cable adapter ( on the tranny
) or internal speedo gear in the tranny.
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If your speedometer is not working, it could be a problem with either the speed sensor or the connecting cable. In either of the cases, the parts require to be replaced.
SOURCE: speedometer and odometer has stoped working
Check on your transmission. The speedometer cable probably is bad or fell out.
SOURCE: 1995 Subaru Legacy. Speedometer stopped working
It's probably your speedo head, the gauge itself. I put several used ones in our car to no avail. When I finally went to the dealer they needed to know my cars serial numbers then sold me a gauge that matched my car. Sounds goofy but it worked! I didled with this problem for over a year on and off before that.
SOURCE: Speedometer stopped working.
The speed sensors will not fix it. This is something that these cars will do in hot weather. The instrument cluster need to be removed and the contacts from the printed circuit to the connector need to be cleaned. Over time they will lose contact and affect the fuel gauge or speedometer. You may have to replace the speedo cluster. Sometimes if you hit the dash just above the fuel gauge it will start working too. Been there done that, fixed mine as the printed circuit was coming apart at the harness connector.
SOURCE: 1990 volvo 740 speedometer quit working
There is a speed sensor on the rear diff cover that may me shot, however it is regulated by hertz so the dealer is the best place to see if the wires are okay. That sensor can be costly.
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