P03AD
Cylinder 3 Pressure Sensor Circuit Intermittent/Erratic
Generic OBD-II
Common symptoms
What you'll notice
- Check and replace spark plugs and ignition coils
- Inspect and clean fuel injectors
- Test and replace the cylinder 3 pressure sensor
- Verify and repair any wiring or connection issues related to the pressure sensor circuit
- Perform a compression test to ensure proper engine function
Common causes
Most likely first
- Faulty cylinder 3 pressure sensor
- Loose or damaged wiring/connectors in the cylinder 3 pressure sensor circuit
- Engine misfire in cylinder 3
- Clogged fuel injector in cylinder 3
- Engine control module (ECM) malfunction or software issue
How to diagnose & fix
Work through it in order
- Engine misfires or runs rough
- Decreased fuel efficiency
- Rough idling or stalling
- Hesitation or lack of power during acceleration
- Check Engine Light illuminates
Read & clear P03AD yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.