OBD-II code guide
P0325 Knock Sensor Circuit Malfunction
P0325 means the engine computer detected a problem in the knock sensor circuit.
What it means
The computer may not be able to monitor engine knock accurately, which can affect timing control.
Common symptoms
- Check engine light
- Pinging or knocking under load
- Reduced power
- Poor fuel economy
- Usually normal idle
Likely causes
- Faulty knock sensor
- Damaged sensor wiring
- Corroded connector
- Engine mechanical noise
- Incorrect sensor torque
First checks
- Inspect wiring near heat and oil leaks.
- Listen for real pinging under load.
- Check for related lean or overheating issues.
- Do not ignore persistent engine knock.