VVT 'A' over-advanced Bank 1 on Mercedes — M271 magnet adjuster failure and M276 chain stretch.
Mercedes-Benz P0011 — VVT 'A' over-advanced Bank 1 on Mercedes — M271 magnet adjuster failure and M276 chain stretch. Typical UK independent garage cost: £140–£2400.
What actually causes P0011 on a Mercedes-Benz
M271 P0011 is a known magnet-adjuster failure — Mercedes part is ~£180. On M276 it's stretched chain showing as advance error — much bigger job.
Mercedes-Benz engines that log P0011
- M271 1.8 Kompressor/turbo (C/E-Class)
- M276 3.5 V6 (C/E/SLK)
- M274 2.0 turbo
How we diagnose P0011 on a Mercedes-Benz
- Read live cam vs crank deviation
- Listen for cold-start chain rattle on M276
- Test magnet adjuster on M271
- Pull cam cover if M276 suspected
The common misdiagnosis to avoid
Many garages condemn the camshaft adjuster solenoid on M276 when the chain is the actual cause — verify via chain rattle and live cam deviation.
Mercedes-Benz P0011 repair cost in the UK
Expect £140–£2400 including parts and labour at an independent garage. Main-dealer quotes on Mercedes-Benz are usually higher for the same job, and the spread exists because the cheap cause and the expensive cause throw the same code — pay for the diagnosis before you pay for parts.
Bob's workshop tip
M271 P0011 — magnet adjuster swap, 45 min job. M276 P0011 — chain kit, day's work. Big difference.
Codes usually seen alongside P0011 on Mercedes-Benz
- P0014
- P0017
Symptoms drivers report with P0011
- Engine rattles like a 'bag of nails' for 3 seconds on a cold start.
- The car felt fine on the motorway, but now it stalls every time I stop at a roundabout.
- Noticeable 'flat spot' or hesitation when trying to overtake in 3rd gear.
- Lumpy, hunting idle that makes the gearstick vibrate.
- Fuel economy has tanked—getting about 10mpg less than usual.
Repairs that clear P0011
- Engine flush and oil change
- Replace VVT solenoid
- Replace cam phaser if needed
For the generic, all-makes explanation of this code — meaning, every known cause and UK cost bands — see our P0011 guide.