P0331

Q: What does OBD2 code P0331 mean?

P0331 means: Knock Sensor 2 Circuit Range/Performance Bank 2. The Bank 2 knock sensor signal is out of the expected range.

Knock Sensor 2 Circuit Range/Performance Bank 2

The Bank 2 knock sensor signal is out of the expected range.

SeverityModerate

CategoryIgnition

Est. Repair Cost$120-$300

Code TypePowertrain

DIY RepairYes

⚡ Common Causes

›Faulty knock sensor
›Loose sensor mounting
›Wiring fault
›Engine mechanical noise interference

⚠️ Symptoms

›Check engine light
›Possible reduced power (ECM retards timing to protect engine)
›Slightly worse fuel economy

✅ How to Fix — Step by Step

Step 1:Torque-check knock sensor mounting
Step 2:Inspect wiring
Step 3:Test sensor output
Step 4:Replace sensor if faulty

🔧 Diagnostic Tools Required

✔OBD-II Diagnostic Scanner
✔Digital Multimeter
✔Basic Hand Tools
✔Flashlight
✔Vehicle Service Manual

Using the correct diagnostic tools helps identify the root cause of P0331 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: Knock sensors must be torqued to the exact factory spec - over or under-tightening changes their sensitivity and can trigger this code.