Engine and gearbox (P)
P0015: Exhaust Camshaft Timing Over-Retarded
The exhaust camshaft on bank 1 is not advancing as it should. This can affect engine performance and efficiency.
Checked by a licensed car technician · last reviewed 29 September 2026
Symptoms
- Rough idling
- Reduced engine power
- Poor fuel economy
- Check engine light on
Common causes
- Oil control valve stuck in retard position
- Worn cam phaser
- Low engine oil level
- Dirty or degraded engine oil
How to check it yourself
- Check engine oil level and condition
- Inspect oil control valve for sticking
- Examine cam phaser for wear
- Read fault codes with a scanner
Can I keep driving?
The car can be driven, but performance may be reduced.
General guidance, not a professional inspection. Confirm faults with measurements before buying parts, and use a qualified mechanic for brakes, steering, fuel leaks, airbags, and other safety-critical work. Terms and disclaimer