P0331

Knock Sensor 2 Circuit Range/Performance

Q: What does fault code P0331 mean?

Knock Sensor 2 Circuit Range/Performance. Bank 2 knock sensor signal is outside the range the ECM expects (companion to the bank 1 knock sensor codes already covered).

Q: What are the symptoms of P0331?

CEL; Possible reduced power (ECM pulls timing defensively)

Q: What are the possible causes of P0331?

Faulty knock sensor; Loose sensor mounting; Wiring issue; Engine mechanical noise misread as knock

Q: How to fix P0331?

Check sensor torque/mounting; Test sensor resistance/output; Inspect wiring; Replace sensor if faulty

Severity: Medium Ignition System Generic OBD-II Code Est. Repair: $150 - $350

Schedule diagnosis soon. Continued driving may worsen the issue.

Quick Answer

P0331 means “Knock Sensor 2 Circuit Range/Performance.” Severity: Medium. Estimated repair cost: $150 - $350. Most common sign: CEL.

What Does P0331 Mean?

Bank 2 knock sensor signal is outside the range the ECM expects (companion to the bank 1 knock sensor codes already covered).

Common Symptoms

CEL

Possible reduced power (ECM pulls timing defensively)

Possible Causes

Faulty knock sensor

Loose sensor mounting

Wiring issue

Engine mechanical noise misread as knock

How to Fix P0331 – Repair Guide

Check sensor torque/mounting

Test sensor resistance/output

Inspect wiring

Replace sensor if faulty

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Budgeting for This Repair?

A typical P0331 repair runs about $150 - $350. If you'd rather spread the cost over time, estimate the payment with our free sister tool: Car Finance Calculator (50-state sales tax, trade-in equity, full amortization).

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Disclaimer: Information is for educational reference only and does not replace professional diagnosis. Actual causes and costs vary by vehicle make, model, year and condition. Always verify with a qualified technician.