1. Faulty instrument cluster: The instrument cluster is the part of the car that houses the speedometer and rev counter. If the instrument cluster is faulty, it could cause the speedo and rev counter to stop working.
2. Faulty wiring: The speedo and rev counter are connected to the car's ECU (engine control unit) by wires. If any of these wires are damaged or faulty, it could cause the speedo and rev counter to stop working.
3. Faulty sensors: The speedo and rev counter rely on sensors to get their readings. If any of these sensors are faulty, it could cause the speedo and rev counter to stop working.
4. Mechanical problems: In rare cases, mechanical problems with the car's transmission or engine can cause the speedo and rev counter to stop working.
5. Blown fuse: Check the fuse box to see if any of the fuses responsible for the speedo and rev counter have blown. If a fuse has blown, replace it with a new one of the same amperage.
6. Software issues: In some cases, software issues with the car's ECU can cause the speedo and rev counter to stop working. This can often be fixed by updating the ECU software.
7. Water damage: Water damage to the instrument cluster, wiring, or sensors can cause the speedo and rev counter to stop working. If you suspect water damage, it's important to have the car inspected and repaired by a qualified mechanic as soon as possible.
If you're not confident in your ability to diagnose and fix the problem yourself, it's best to take your Astra coupe to a qualified mechanic for diagnosis and repair.
