At a Glance
The Mercedes-benz B-class W246 has 4 identified problems that occur more often than the UK average, with Tyre condition being the most reported. Tyres & Wheels is the most common MOT failure category. The most serious issue flagged is Tyre condition, rated as dangerous. Based on 360K MOT tests from DVSA data.
Problems are patterns in the DVSA data that occur significantly more often on this model than the UK average — confirmed at 99% statistical confidence. Read how we calculate MOT pass rates and problems →
Below: the full MOT-data picture for the Mercedes-benz B-class W246 — MOT pass rate vs the UK average, common problems vs UK fleet patterns, the most likely MOT failures by frequency, fault occurrence by mileage band, and pass/fail trends. All numbers drawn from DVSA records.
Mercedes-benz B-class W246 MOT Pass Rate
Across 360K MOT tests from DVSA data, the Mercedes-benz B-class W246 (2011–2018) has a fail rate of 19.2%.
UK average fail rate (2011–2018): 37.4%
Common Mercedes-benz B-class W246 Problems
Owner-submitted reports plus patterns we've identified across 559 million UK MOT tests. Each MOT-derived item below — whether tagged as a Problem, Wear & Tear or Consumable — shows up noticeably more often on this generation than across the UK fleet, which is why it's here. Owner reports are pinned to the top by default; use the sort and filter pills below to view a specific tier or change the order.
Tyre condition
4,624
occurrences
Headlamp washer not working
501
occurrences
Headlamp defect (no aim check)
168
occurrences
Passenger airbag fault
136
occurrences
Tell Us About Your Problem
Help other Mercedes-benz B-class W246 owners — report a problem and we'll add it to the database
Tell Us About Your Problem
Help other Mercedes-benz B-class W246 owners — report a problem and we'll add it to the database
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Problems by mileage
Common problems, MOT failures and advisories on the Mercedes-benz B-class W246, grouped by the mileage they typically appear at.
515 distinct problems · 271,260 total occurrences in current filter
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Advisory items are MOT tester observations. Frequency can be influenced by driving style and usage patterns.
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Other Mercedes-benz B-class Generations
Frequently Asked Questions
What are the most common Mercedes-benz B-class W246 problems?
Based on DVSA MOT data for the Mercedes-benz B-class W246 (2011–2018), we have identified 4 common problems. The most frequently reported is "Tyre condition". Tyres & Wheels is the most common MOT failure category.
How reliable is the Mercedes-benz B-class W246?
This generation has 360K MOT tests on record with a 19.2% fail rate. A fault is flagged as a "Common Problem" only when it occurs significantly more often on this model than the UK average, confirmed at 99% statistical confidence.
What commonly fails the MOT on a Mercedes-benz B-class W246?
There are 133 distinct MOT failure types recorded for the W246 (2011–2018), grouped by the mileage these failures typically occur. See the Common MOT Failures section on this page.
Can I report a problem with my Mercedes-benz B-class W246?
Yes — use the "Tell Us About Your Problem" form on this page. Your report helps other Mercedes-benz B-class owners spot problems early. All submissions are reviewed before being added to the public database.
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