P0330 Knock sensor B circuit (bank 2)
What P0330 means
The engine computer has a problem with the signal from knock sensor B, which is on bank 2 or is the second sensor on an inline engine. Without it, the computer retards ignition timing on the affected cylinders as a precaution, which costs power and fuel.
P0330 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
- 1–6 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
- Damaged wiring or connector, often under the intake manifold
- Sensor loose or not tightened to the correct torque
- Corrosion between the sensor and the engine block
Can I keep driving with P0330?
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
- Check the sensor B connector and wiring for damage, corrosion and oil contamination.
- Check the sensor is tightened to the specified torque.
- Measure the sensor resistance and check the wiring for continuity.
- Replace the sensor if it is out of specification.
Related codes
- P0332 Knock sensor B circuit low (bank 2)
- P0335 Crankshaft position sensor A circuit
- P0336 Crankshaft position sensor A circuit range/performance
- P0328 Knock sensor A circuit high (bank 1 or single sensor)
- 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
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.
Updated: