P0326: Knock/Combustion Vibration Sensor A Circuit Range/Performance
What to do
Expect reduced performance. If there is an audible rattle from the engine bay, mention it — a loose heat shield or bracket can produce this code with a perfectly good sensor.
What this code means
Sensor A's signal — the bank 1 sensor, named as at P0325 — is electrically valid but implausible — too quiet, too noisy, or not correlating with engine load the way real combustion noise does. A sensor hearing genuine mechanical noise sets this honestly: worn bearings, a loose accessory bracket or a rattling heat shield all produce knock-band noise that is not detonation.
Likely causes
Start here
- Faulty knock sensor · moderate
- Incorrect knock sensor mounting torque · moderate
- Loose heat shield or bracket producing noise · easy
Less common
- Low octane or poor quality fuel · easy
- Carbon deposits on intake valves · specialist
Rare
- Worn engine bearings · specialist
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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