P0328 Knock sensor A circuit high (bank 1 or single sensor)
What P0328 means
The signal from knock sensor A is higher than the engine computer considers plausible. This can be an electrical fault or genuine heavy vibration from the engine. The computer retards ignition timing to protect the engine.
P0328 is a generic SAE J2012 code: it means the same on every make. The exact cause still depends on the car, so read the freeze-frame data before replacing parts.
At a glance
- Severity
- Medium
- Typical repair cost
- 80–300 €
- Workshop time
- 1.5–6 h
- Repair difficulty
- Hard
- DIY possible
- No
- Check engine light
- Yes
- Affects emissions test
- Yes
Parts and labour at an independent workshop in Europe. Main dealers charge more; the cause decides the bill, not the code.
Symptoms
- Check engine light on
- Reduced power from retarded ignition timing
- Higher fuel consumption
- Possible audible pinging under load
Common causes
- Failed knock sensor
- Signal wire shorted to voltage
- Loud mechanical noise from the engine (loose components, valvetrain, worn bearings)
- Real knock from low-octane fuel or overheating
Can I keep driving with P0328?
You can drive, but have it checked within one to two weeks. Use the correct fuel grade and avoid heavy load or full throttle, because knock protection is reduced.
What to check first
- Listen for abnormal engine noises and check for loose heat shields or brackets.
- Check that the correct fuel grade is used and the engine is not overheating.
- Inspect the wiring for a short to voltage.
- Test and replace the knock sensor if needed.
Related codes
- P0327 Knock sensor 1 circuit low (bank 1 or single sensor)
- P0326 Knock sensor A circuit range/performance (bank 1 or single sensor)
- P0325 Knock sensor A circuit (bank 1 or single sensor)
- P0320 Ignition/distributor engine speed input circuit
- P0330 Knock sensor B circuit (bank 2)
- P0332 Knock sensor B circuit low (bank 2)
- P0335 Crankshaft position sensor A circuit
- P0336 Crankshaft position sensor A circuit range/performance
Data: TORKO fault-code catalogue, built on OBDex (CC0-1.0) and reviewed against workshop practice. Informational only — it does not replace a diagnosis by a mechanic.
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