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MOT reliability

Mercedes-benz B-class

77,758 vehicles · 994,464 completed MOT tests analysed
79%
MOT pass rate

Based on 77,758 Mercedes-benz B-class vehicles and 994,464 completed MOT tests, the Mercedes-benz B-class has an overall 79% pass rate, with an average recorded mileage of 87,583 miles.

77,758
Vehicles
994,464
MOT tests
6,594
Avg miles / year
1.6
Faults per test
3%
Dangerous-fault share

Mercedes-benz B-class problem areas

Where faults occur most across all Mercedes-benz B-class MOT tests:

  • Other40%
  • Tyres, wheels & suspension30%
  • Brakes21%
  • Lamps & electrical7%
  • Body & structure3%
  • Visibility3%
  • Emissions & nuisance2%
  • Identification & plates1%

Mercedes-benz B-class pass rate by age

How the Mercedes-benz B-class's MOT pass rate changes as it ages (buckets with 20+ tests).

Age (years)TestsPass rate
19989%
22,50890%
389,34188%
487,23987%
588,53085%
689,28084%
790,82382%
888,55780%
983,84178%
1076,81577%
1170,06675%
1259,83873%
1348,52072%
1438,20870%
1530,40569%
1622,28269%
1714,48468%
188,30968%
193,92668%
201,23668%

Fuel types: Diesel (51,987), Petrol (25,310), Electric (458), LPG (2), Hybrid Electric (Clean) (1)

Most common Mercedes-benz B-class MOT faults

These are the faults and advisories recorded most often across Mercedes-benz B-class MOT tests:

  1. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e)) (32,230 times)
  2. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e)) (31,780 times)
  3. Offside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii)) (21,580 times)
  4. Nearside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii)) (21,515 times)
  5. Under-trays fitted obscuring some underside components (18,695 times)
  6. Nearside Rear Brake pipe corroded, covered in grease or other material (1.1.11 (c)) (17,754 times)
  7. Nearside Front Tyre worn close to the legal limit (4.1.E.1) (16,550 times)
  8. Rear Brake pad(s) wearing thin (1.1.13 (a) (ii)) (16,267 times)
  9. Offside Rear Brake pipe corroded, covered in grease or other material (1.1.11 (c)) (15,588 times)
  10. Offside Front Tyre worn close to the legal limit (4.1.E.1) (15,537 times)
  11. Front Brake pad(s) wearing thin (1.1.13 (a) (ii)) (15,287 times)
  12. Front Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii)) (15,248 times)
  13. Nearside Rear Child Seat fitted not allowing full inspection of adult belt (13,934 times)
  14. Rear Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii)) (11,615 times)
  15. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e)) (10,888 times)

Mercedes-benz B-class pass rate by registration year

YearVehiclesTestsPass rateAvg mileage
2025 3 7 57% 72,682
2024 4 7 100% 55,042
2023 1 1 100% 84,926
2022 4 7 100% 31,759
2021 4 7 100% 55,827
2020 24 60 88% 36,651
2019 571 3,122 91% 40,181
2018 3,909 24,631 88% 47,229
2017 5,834 44,670 87% 56,570
2016 5,479 46,493 86% 63,838
2015 5,867 56,620 85% 72,044
2014 8,747 95,238 83% 80,942
2013 7,812 91,784 83% 86,801
2012 6,497 83,256 81% 92,761
2011 4,158 63,543 76% 92,538
2010 5,473 87,919 77% 98,305
2009 5,710 95,612 76% 103,888
2008 5,356 92,201 76% 109,266
2007 5,136 88,565 75% 110,332
2006 5,566 94,166 75% 111,120
2005 1,597 26,532 75% 111,626
2004 2 17 76% 160,372
1996 1 4 50% 186,377
1989 1 6 67% 88,717
1975 1 1 100% 28,518

Mercedes-benz B-class reliability FAQ

Across 77,758 Mercedes-benz B-class vehicles in our MOT data, 79% pass the MOT (a 21% failure rate), with about 1.6 faults or advisories recorded per test.

The most frequently recorded Mercedes-benz B-class MOT issues are: Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e)); Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e)); Offside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii)).

The typical Mercedes-benz B-class in our data has covered around 87,583 miles.

Compare the Mercedes-benz B-class

See how the Mercedes-benz B-class stacks up against other Mercedes-benz models on MOT reliability:

B-class vs C B-class vs E B-class vs Sprinter B-class vs A-class

Check a specific Mercedes-benz B-class

Enter a registration to see that exact vehicle's full MOT history, advisories and recurring faults.

See all Mercedes-benz models · Learn about common MOT failures · what an MOT checks