P033E: Knock Sensor 4 Circuit Intermittent (Bank 2)
The P033E code indicates an intermittent fault in the knock sensor 4 circuit on bank 2 of the engine. The knock sensor detects engine vibrations caused by detonation (knocking) and sends a signal to the PCM. An intermittent circuit issue means the signal is lost or erratic, which can lead to incorrect ignition timing adjustments, reduced performance, and potential engine damage if knocking occurs undetected.
01. Most Common Causes
- Faulty knock sensor 4
- Damaged or corroded wiring/connector in the sensor circuit
- Intermittent short or open in the sensor circuit
- Engine mechanical issue causing false knock readings
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Reduced engine power or hesitation
- Poor fuel economy
- Engine knocking or pinging noise
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data to confirm P033E and check for related codes.
Step 2: Visually inspect knock sensor 4 (bank 2) wiring and connector for damage, corrosion, or loose connections.
Step 3: Use a multimeter to test sensor resistance and check for shorts or opens in the circuit.
Step 4: If wiring is intact, replace knock sensor 4 and clear codes; test drive to verify repair.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as undetected engine knock can cause serious internal damage. Have the issue diagnosed promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on sensor location and labor rates.