P03A3
Cylinder 2 Pressure Sensor Circuit Intermittent/Erratic
Generic OBD-II
Common symptoms
What you'll notice
- Check and ensure proper connection and wiring of the cylinder 2 pressure sensor.
- Inspect and clean the cylinder 2 pressure sensor to remove any debris or dirt.
- Replace the cylinder 2 pressure sensor if it is damaged or malfunctioning.
- Verify the engine control unit (ECU) software for any updates or reflash if necessary.
Common causes
Most likely first
- Loose or faulty wiring/connection in the cylinder 2 pressure sensor circuit
- Malfunctioning cylinder 2 pressure sensor
- Engine misfire in cylinder 2
- Fuel delivery issue to cylinder 2
- Compression problem in cylinder 2
How to diagnose & fix
Work through it in order
- Engine misfires or runs rough
- Decreased fuel efficiency
- Lack of power or acceleration
- Check Engine Light (CEL) flashing or illuminated
- Irregular or fluctuating engine idle speed
Read & clear P03A3 yourself
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