Fault code P0333 – a step-by-step guide to diagnosing and fixing it

Error code P0333 is displayed and the check engine light is on - what does this mean?

DTC P0333 is triggered by the OBD/EOBD system when a problem is detected with knock sensor 2 in cylinder bank 2. This fault code indicates that the control unit is receiving too high a voltage signal from the knock sensor. With various manufacturers, this trouble code can also be referred to as "Knock Sensor 2 Circuit High Input Bank 2".

What causes can this error code have?

• Defective knock sensor 2 on cylinder bank 2
• Damaged wiring to the knock sensor
• Corroded or loose plug connections
• Short circuit in the sensor cable
• Faulty ground connection of the sensor
• Defective engine control unit (ECU)
• Incorrect sensor installation or loose fit

What symptoms occur in parallel with error code P0333?

• Engine problems: Unsteady idling and reduced engine power
• Knocking noises: Metallic knocking noises during acceleration
• Fuel consumption: Increased consumption due to inaccurate ignition angle control
• Check engine light: Permanently illuminated check engine light
• Acceleration problems: Delayed response when accelerating
• Exhaust values: Deteriorated emission values during the emissions test

How can the problem with error code P0333 be rectified?

• The repair of error code P0333 requires a systematic diagnosis and appropriate measures.
• Replace knock sensor 2 on cylinder bank 2 completely and fit properly with the prescribed torque
• Check the wiring to the knock sensor and replace damaged cables or plug connections
• Clean the ground connections of the sensor and replace completely if corroded
• Dismantle and clean plug connections on the sensor and control unit and treat with contact spray
• Check the engine control unit for defects and replace or reprogram if necessary
• Delete the fault memory after the repair and carry out a test drive to check the function