P03F9B Camshaft Position Actuator Position Sensor C Circuit High Bank 1
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- On some engines the exhaust cam phaser (camshaft position actuator B) has its own position sensors, which tell the engine module where the phaser actually is; sensor C is the third of them, bank 1 the side with cylinder 1. This is a different family from the sliding-cam position sensors (P2C05 ff). P03F9 means the signal stays above its upper limit – typically an open sensor ground, a signal wire shorted to 5 V or battery voltage, or a faulty sensor. No manufacturer document available to us uses this code (GM, Ford and FCA tables checked); the intake counterpart P03E5 ff is equally unused. The phaser is then usually held in its base position.
- What you may notice
- Check engine light on
- Exhaust cam phasing held in its base position, loss of power
- Possibly rough idle or poorer emissions
- Likely causes
- LikelySensor ground open or signal wire shorted to 5 V or battery voltage
- PossibleSensor faulty
- PossibleConnector wet or corroded
- RareEngine module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €100 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.