# Mercedes-Benz B-Class MOT reliability: pass rate and common failures | RegFlags

The Mercedes-Benz B-Class passes its MOT first time 70% of the time, from 60,789 MOT tests. See pass rates by year, common failures and typical mileage.

- First-time MOT pass rate: 70%
- MOT tests analysed: 60,789 (DVSA anonymised MOT data, 2025)
- Most common failure area: Lights & electrics

## By year of first use and fuel

| Year | Fuel | MOT tests | First-time pass rate |
| --- | --- | --- | --- |
| 2025 | Petrol | 2 (very few mots) | 100% |
| 2025 | Diesel | 1 (very few mots) | 0% |
| 2024 | Petrol | 2 (very few mots) | 100% |
| 2023 | Diesel | 1 (very few mots) | 100% |
| 2022 | Petrol | 3 (very few mots) | 100% |
| 2021 | Petrol | 3 (very few mots) | 100% |
| 2020 | Petrol | 13 (very few mots) | 77% |
| 2020 | Diesel | 4 (very few mots) | 75% |
| 2019 | Petrol | 443 | 89% |
| 2019 | Diesel | 155 | 85% |
| 2018 | Diesel | 1,962 | 81% |
| 2018 | Petrol | 1,934 | 86% |
| 2018 | Electric | 1 (very few mots) | 100% |
| 2017 | Diesel | 4,663 | 80% |
| 2017 | Petrol | 916 | 83% |
| 2017 | Electric | 99 (few mots) | 78% |
| 2017 | Hybrid | 1 (very few mots) | 100% |
| 2016 | Diesel | 4,294 | 78% |
| 2016 | Petrol | 841 | 84% |
| 2016 | Electric | 210 | 76% |
| 2015 | Diesel | 4,764 | 76% |
| 2015 | Petrol | 803 | 83% |
| 2015 | Electric | 81 (few mots) | 82% |
| 2014 | Diesel | 7,130 | 71% |
| 2014 | Petrol | 1,039 | 78% |
| 2013 | Diesel | 5,559 | 70% |
| 2013 | Petrol | 1,404 | 77% |
| 2012 | Diesel | 3,918 | 68% |
| 2012 | Petrol | 1,732 | 73% |
| 2011 | Petrol | 1,789 | 59% |
| 2011 | Diesel | 1,571 | 58% |
| 2010 | Petrol | 2,298 | 60% |
| 2010 | Diesel | 1,977 | 56% |
| 2010 | LPG | 1 (very few mots) | 100% |
| 2009 | Petrol | 2,004 | 60% |
| 2009 | Diesel | 1,963 | 56% |
| 2008 | Petrol | 1,536 | 56% |
| 2008 | Diesel | 1,530 | 55% |
| 2007 | Petrol | 1,126 | 57% |
| 2007 | Diesel | 1,097 | 54% |
| 2006 | Petrol | 1,001 | 58% |
| 2006 | Diesel | 596 | 53% |
| 2005 | Petrol | 199 | 59% |
| 2005 | Diesel | 123 | 48% |

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