Cylinder 3 Pressure Sensor Circuit Intermittent/Erratic

Where it lives

For P03AD, the circuit described runs through the sensor. The description of P03AD puts it on cylinder 3.

Check these first

• A loose connector at the cylinder 3 pressure sensor
• A harness that loses the sensor 3 signal with vibration
• A sensor 3 failing as it heats up
• Corroded sensor 3 pins
• Oil or debris moving on the sensor 3 tip

What to do next

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

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