Used car guide

2011 Mercedes-Benz B-Class: common problems and what to check

What gets flagged at MOT on 2011 Mercedes-Benz B-Classs, from 3,373 tests in 2025, plus known faults and what to look at before you buy one.

3,373MOT tests in 2025
59%pass first time (all 2011 cars: 61%)
5,900typical miles a year
3.6×the usual rate for rigid brake pipes

What stands out

Parts flagged at MOT more often on 2011 Mercedes-Benz B-Classs than on all cars registered in 2011.

  • Rigid brake pipes3.6× usual
    Mercedes-Benz B-Class
    21.7% All 2011 cars
    6.1%

    Failed outright at MOT: 2.8%, against 1% of all 2011 cars. The rest were advisories or minor defects.

    Rough price £100–£400 our estimate

    At the viewing: Ask to see underneath, or check the MOT advisories: corroded brake or fuel pipes get worse every year and fail the MOT when they do.

  • Side repeaters5.8× usual
    Mercedes-Benz B-Class
    7.5% All 2011 cars
    1.3%

    Failed outright at MOT: 6.3%, against 0.8% of all 2011 cars. The rest were advisories or minor defects.

    Rough price £10–£80 our estimate

    At the viewing: Ask a friend to check every light, including brake lights and indicators, while you operate them.

  • Individual direction indicators2.5× usual
    Mercedes-Benz B-Class
    7.8% All 2011 cars
    3.1%

    Failed outright at MOT: 3.5%, against 1.2% of all 2011 cars. The rest were advisories or minor defects.

    Rough price £10–£80 our estimate

    At the viewing: Ask a friend to check every light while you work the switches: indicators, brake lights, fog lights and reversing lights.

  • Link ball joint covers2.6× usual
    Mercedes-Benz B-Class
    7% All 2011 cars
    2.7%

    Failed outright at MOT: 3.1%, against 1.6% of all 2011 cars. The rest were advisories or minor defects.

    Rough price £60–£150 (one joint) ClickMechanic

    At the viewing: Listen for knocking over bumps and check the rubber boots behind the wheels aren't split.

  • Corroded fuel pipes14× usual
    Mercedes-Benz B-Class
    4.2% All 2011 cars
    0.3%

    Failed outright at MOT: 0%, against 0% of all 2011 cars. The rest were advisories or minor defects.

    Rough price £100–£400 our estimate

    At the viewing: Ask to see underneath, or check the MOT advisories: corroded brake or fuel pipes get worse every year and fail the MOT when they do.

Better than most

Suspension arm bushes and joints: 2.3% here, against 10.8% of all 2011 cars. Engine oil leaks: 2.2% here, against 8.9% of all 2011 cars.

By area

The share of 2011 Mercedes-Benz B-Class MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

  • Brakes
    42% of testsRough price £150–£350

    At the viewing: Look for a lip on the disc edges and feel for judder or pulling when braking firmly from about 40mph.

  • Suspension
    35% of testsRough price £120–£400

    At the viewing: Listen for knocks over speed bumps, and look behind each front wheel for a snapped coil spring.

  • Tyres
    33% of testsRough price £70–£150

    At the viewing: Check the tread on all four tyres, including the inside edges, and look for cracks or bulges.

  • Lights and electrics
    29% of testsRough price £10–£80

    At the viewing: Ask a friend to check every light, including brake lights and indicators, while you operate them.

  • Wipers, windscreen and mirrors
    10% of testsRough price £15–£250

    At the viewing: Check for chips in the driver's view, and test the wipers and washers.

  • Driveshafts and joints
    8% of testsRough price £60–£350

    At the viewing: On full steering lock, drive slowly and listen for clicking from the front wheels.

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Other years

YearMOT testsMost flagged
2019599Tyres 25%
20183,892Tyres 31%
20175,689Tyres 29%
20165,353Tyres 31%
20155,654Tyres 32%
20148,185Tyres 32%
20136,957Tyres 33%
20125,658Tyres 32%
20104,279Brakes 44%
20093,989Brakes 48%
20083,072Brakes 51%
20072,249Brakes 47%
20061,611Brakes 51%

Where this comes from: the DVSA's anonymised results for every MOT test in Great Britain in 2025, counting tests of 2011 Mercedes-Benz B-Classs registered in 2011. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score