P0025 — Camshaft Position 'B' (Exhaust) Timing Over-Retarded (Bank 1) - cam adjuster/magnet
CAUTIONIs it safe to drive? Drive gently and get it looked at soon — it can worsen or fail inspection.
What P0025 means
This is a manufacturer-specific code — its meaning depends on the vehicle’s make (see below).
What P0025 means on specific makes
Mercedes-Benz CAUTION
Generic code, common on MB M272/M273. The exhaust camshaft adjuster (or its solenoid 'cam magnet') isn't achieving commanded timing. On MB the cam magnets/adjusters and their oil-soaked wiring are a known repeat offender; can cause misfires.
- Camshaft adjuster magnet/solenoid ($100-300)
- Camshaft adjuster (actuator) itself ($300-800)
- Oil-contaminated cam magnet wiring harness
- Low/dirty oil affecting adjuster
Check first: Test/replace the cam magnet solenoid first; inspect harness for oil. If misfires accompany it, the adjuster may be worn.
Source: BenzWorld P0025/P0021 W211 E350 threads