P0333

Q: What does OBD2 code P0333 mean?

P0333 means: Knock Sensor 2 Circuit High Input Bank 2. The Bank 2 knock sensor is reading a higher signal than expected.

Knock Sensor 2 Circuit High Input Bank 2

The Bank 2 knock sensor is reading a higher signal than expected.

SeverityModerate

CategoryIgnition

Est. Repair Cost$120-$300

Code TypePowertrain

DIY RepairYes

⚡ Common Causes

›Faulty knock sensor
›Wiring short circuit
›Engine mechanical noise (rod knock, etc.)

⚠️ Symptoms

›Check engine light
›ECM may retard timing, reducing power and fuel economy

✅ How to Fix — Step by Step

Step 1:Inspect wiring for shorts
Step 2:Test sensor output
Step 3:Rule out mechanical engine noise
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 P0333 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: Rule out actual engine knock (rod bearing wear) before replacing the sensor - a genuinely noisy engine can trigger a real high-input reading.