OBD-II Generic Error Code P0331: Knock Sensor 2 Range/Performance - How to Fix It

Q: Can I drive with a P0331 code?

Driving with a P0331 code is not recommended as it can cause reduced engine performance, poor fuel economy, and potential engine damage due to undetected knocking. It's best to diagnose and repair the issue promptly.

Q: What does knock sensor 2 range/performance mean?

This means the ECM has detected that the signal from knock sensor 2 is outside the expected range or the sensor is not performing correctly, often due to a faulty sensor, wiring issue, or improper mounting.

Q: How much does it cost to fix a P0331 code?

If you DIY, a replacement knock sensor typically costs $30-$100. If you have a mechanic replace it, labor adds $100-$200, bringing the total to $130-$300.

Q: Can a bad knock sensor cause other problems?

Yes, a faulty knock sensor can cause the ECM to retard ignition timing excessively, leading to reduced power, poor acceleration, and increased emissions. It may also trigger other related codes.

Q: Where is knock sensor 2 located?

On V6/V8 engines, sensor 2 is typically on the opposite cylinder bank from sensor 1. On inline engines, sensor 2 may be near the transmission bell housing. Consult your service manual for the exact location.

Abstract

Error code P0331 indicates that the Engine Control Module (ECM) has detected a problem with the knock sensor 2 circuit, often related to range or performance. This sensor monitors engine vibrations caused by knocking or pinging, and a fault can reduce engine performance and fuel efficiency. Common causes include a faulty knock sensor, wiring issues, or a loose sensor bolt.