1st sign of problem 3yrs ago , overheated , lost power, had to be towed. no problem again until 4 mo. ago Overheating, losing power. have replaced fuel pump, water pump, radiator, fan thermostat, alternator. FIXD is saying Knock Sensor Circuit High, input Bank 1P0328 Severity level high ? My husband doesn’t believe FIXD, yet everything his mechanics have done, hasn’t solved problem. Anyone know ?
Why? The code IS what it IS. It is just a tool to read engine codes and any code reader would give the same answer. It IS a hint that the knock sensor is getting a signal much higher than it should. Some of the causes could be:
- Damaged knock sensor connector
- Open or shorted to ground knock sensor circuit
- Shorted to voltage knock sensor circuit
- Loose knock sensor
- Damaged knock sensor
- Low fuel pressure
- Wrong fuel octane
- Circuit experiencing electrical interference
- Mechanical engine problem
- Overheating engine
- Failed PCM (rare)
Notice overheating could be the cause of the code. A bad head gasket might cause the overheating which then sets the code. Overheating 4 years ago may have weakened the head gasket on bank 1 and now its failed.
Has any mechanic run a pressure check on the cooling system? Or checked for bubbles or oily residue in the overflow tank? Or run a compression or leakdown test? If they haven’t, you need to find a better mechanic.