If your speedometer isn't working, you should not start randomly replacing fuses. Instead, you should:
1. Check the owner's manual: Your owner's manual should have a fuse box diagram showing which fuses control what circuits. While there isn't a "speedometer fuse," you might find a fuse related to the instrument cluster or related gauges.
2. Check all relevant fuses: Even if the manual doesn't specifically mention a speedometer fuse, carefully inspect all fuses in both fuse boxes (usually one under the hood and one inside the vehicle, often under the dash). Look for blown fuses (broken filament). *Replace any blown fuses with the correct amperage rating only.*
3. Inspect the speed sensor: This sensor is located on the transmission. A faulty speed sensor is a common cause of speedometer problems. You may need to consult a repair manual or a mechanic for location and testing.
4. Check the instrument cluster: A problem within the instrument cluster itself (wiring, gauge failure) could be the culprit. This requires more specialized testing.
5. Consult a mechanic: If you've checked fuses and the speed sensor and still have a problem, it's time to seek professional help. A mechanic can diagnose the issue properly and repair it. It's much more likely a wiring, sensor, or instrument cluster problem than a simple blown fuse.
