Cylinder 2 Pressure Sensor Circuit Intermittent/Erratic

Where it lives

For P03A3, the sensor sits on the circuit this code reports. The description of P03A3 puts it on cylinder 2.

Check these first

• A loose connector at the cylinder 2 pressure sensor
• A harness that loses the sensor 2 signal with vibration
• A sensor 2 failing as it heats up
• Corroded sensor 2 pins
• Oil or debris moving on the sensor 2 tip

What to do next

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

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