Fault code P0332 – a step-by-step guide to diagnosing and fixing it

Error code P0332 is displayed and the check engine light is on - what does this mean?

With this DTC, the OBD/EOBD system detects a problem with knock sensor 2 (bank 2) or its circuit. Error code P0332 indicates that the control unit is receiving too weak a signal or no signal at all from the knock sensor, which is affecting the knock control.

What can cause this error code?

• Defective knock sensor 2 (bank 2)
• Damaged or corroded cables in the knock sensor circuit
• Loose or corroded plug connections
• Defective engine control unit (ECU)
• Mechanical engine damage (piston seizure, bearing damage)
• Incorrect knock sensor installation or insufficient tightening torque
• Ground connection error in the knock sensor circuit

What symptoms occur in parallel with fault code P0332?

• Loss of power: The engine noticeably loses power, especially under load or when accelerating.
• Knocking noises: Metallic knocking or ringing noises from the engine compartment, especially at full throttle.
• Increased fuel consumption: The engine consumes significantly more fuel than usual.
• Uneven engine running: The engine runs unevenly or jerks, especially at idle.
• Misfiring: Noticeable jerking while driving due to incomplete combustion.

How can the problem with error code P0332 be rectified?

• Repairing trouble code P0332 requires a systematic diagnosis of the knock sensor components.
• Replace knock sensor 2: Locate the defective knock sensor on bank 2, remove it professionally and replace it with an original part, observing the prescribed tightening torque.
• Repair wiring harness: Identify damaged cables in the knock sensor circuit, replace defective cable sections and insulate and protect all connections against moisture.
• Repair plug connections: Clean all connectors in the knock sensor circuit, remove corrosion, treat contacts with contact spray and seal tightly.
• Check earth connections: Check all ground points of the knock sensor system, clean and replace if necessary to ensure a proper electrical connection.
• Diagnose the engine control unit: Check ECU with professional diagnostic technology, update software if necessary or have ECU replaced if irreparably defective.