Knock/Combustion Vibration Sensor D Circuit

Where it lives

For P033A, the sensor sits on the circuit this code reports. The description of P033A reports a fault at the sensor.

Check these first

• Failed knock sensor D
• Open or shorted wire in the knock sensor D circuit
• Corrosion or water in the knock sensor D connector
• Loose or overtorqued knock sensor D losing its reference
• Engine knock or mechanical noise confusing sensor D

What to do next

1. Check knock sensor D mounting and torque
2. Inspect the knock sensor D connector for corrosion
3. Test the knock sensor D circuit for opens and shorts
4. Read knock sensor D live data for activity
5. Replace knock sensor D if the circuit is sound but the signal is dead
6. Clear the code and retest

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