This code indicates that the ignition system is not functioning properly. This could be due to a number of factors, such as:
- Faulty spark plugs
- Faulty spark plug wires
- Faulty distributor cap or rotor
- Faulty ignition coil
Code 51 - Insufficient Voltage to the Throttle Position Sensor (TPS)
This code indicates that the TPS is not receiving enough voltage to operate properly. This could be due to a number of factors, such as:
- Faulty wiring
- Loose connections
- Faulty TPS
Note: If you are not comfortable troubleshooting and repairing electrical problems, it is best to have your vehicle diagnosed and repaired by a qualified mechanic.