Fault code P0330 – a step-by-step guide to diagnosing and fixing it

Error code P0330 is displayed and the check engine light is on - what does this mean?

The OBD/EOBD system uses DTC P0330 to detect a problem with knock sensor 2 in bank 2 of the engine. This trouble code indicates that the control unit is receiving an implausible or missing signal from the second knock sensor, which can lead to engine damage due to uncontrolled knock combustion.

What can cause this error code?

• Defective knock sensor 2 (bank 2)
• Damaged or corroded cable to the knock sensor
• Loose or poor plug connections
• Faulty wiring in the knock sensor circuit
• Defective engine control unit (ECU)
• Incorrect installation or loose fit of the sensor
• Short circuit or short to ground in the sensor cable
• Mechanical engine damage causing vibrations

What symptoms occur in parallel with fault code P0330?

• Engine knocking: Clearly audible knocking noises, especially under load
• Loss of power: Reduced engine power and poor acceleration
• Increased fuel consumption: Engine runs inefficiently due to faulty ignition control
• Smooth engine running: Engine runs unevenly at idling speed
• Check engine light: Permanent display of the warning light
• Jerking when accelerating: Particularly noticeable at higher engine speeds

How can the problem with fault code P0330 be rectified?

• Repairing fault code P0330 requires a systematic diagnosis of the knock sensor components.
• Replace knock sensor 2: Replace the defective sensor in bank 2 with an original part and fit it with the prescribed torque
• Check and repair the wiring harness: Inspect all cables to the knock sensor for damage, corrosion or breaks and replace defective sections
• Clean plug connections: Dismantle sensor plug, clean contacts with contact spray and reconnect firmly
• Test the engine control unit: Perform an ECU function test and replace or reprogram the control unit if it is defective
• Check ground connection: Check the ground connections of the sensor and engine for tightness and cleanliness
• Complete recalibration: After repair, delete the fault memory and carry out a test drive to calibrate the system