Powertrain
generic / SAE
P25DF
A Camshaft Position Control Performance Bank 1
Camshaft phaser A on bank 1 follows the commanded angle too slowly, oscillates, or shows steady-state error outside tolerance. Closed-loop control of cam timing is degraded.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / DF
Possible causes
- Oil control valve spool sticks under varnish high
- Stretched timing chain shifts cam reference medium
- Wrong oil viscosity slows phaser response medium
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 150–1500 €
- Estimated time: 1–5 h
- Component: cam phaser a b1
- Component: oil control valve
- Component: cam position sensor
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012