Cylinder 4 Pressure Sensor Circuit Intermittent/Erratic

Where it lives

For P03B7, the circuit described runs through the sensor. The description of P03B7 puts it on cylinder 4.

Check these first

• A loose connector at the cylinder 4 pressure sensor
• A harness that loses the sensor 4 signal with vibration
• A sensor 4 failing as it heats up
• Corroded sensor 4 pins
• Oil or debris moving on the sensor 4 tip

What to do next

1. Wiggle test the sensor 4 harness with a scan tool connected
2. Inspect the cylinder 4 connector for loose or pushed pins
3. Watch cylinder 4 pressure as the engine warms up
4. Clean the sensor 4 tip
5. Replace the cylinder 4 pressure sensor if the signal jumps
6. Clear the code and retest

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