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.
Reading P0011 on a Mercedes-Benz properly
A generic reader will show P0011 and nothing else. What matters is the freeze-frame data stored with it — engine speed, load, coolant temperature and fuel trims at the moment the fault was logged — plus whether any other module on the Mercedes-Benz has logged something at the same time. Codes rarely arrive alone, and the order they were stored in usually points at which one is the cause and which are the consequences.
Clearing P0011 without fixing it
Erasing the code resets the Mercedes-Benz's readiness monitors as well as the light. The fault returns on the next drive cycle if the cause is still there, and in the meantime the incomplete monitors can stop the car passing an emissions check. After a genuine repair, the car is driven until the relevant monitor completes before it is handed back.
Bob's Mechanical Repairs is an independent garage in Birnam, Dunkeld, Perthshire, with 32 years of Bob's experience on the tools. If P0011 is showing on your Mercedes-Benz, bring any scan results with you — we will read the live data ourselves, confirm which cause it actually is, and price the repair before any work starts.