---
title: "Mercedes-Benz B-Class MOT pass rate"
canonical: https://www.carbuyeriq.com/mot-pass-rates/mercedes-benz/b-class
last_updated: 3 October 2026
source: CarBuyerIQ, from DVSA MOT testing data (Open Government Licence v3.0)
licence: CC BY 4.0
data_period: MOT tests completed 2004 to 2026
---

# Mercedes-Benz B-Class MOT pass rate

The Mercedes-Benz B-Class has an MOT pass rate of 80.4% across 12,325 tests, 1.3 points above the UK average of 79.1%. It ranks 176 of 386 models by pass rate (1 is the highest). The defect area recorded most often is tyres (29.7% of all defects and advisories recorded).

| Measure | Value |
| --- | ---: |
| Tests analysed | 12,325 |
| Pass rate | 80.4% |
| Fail rate | 19.6% |
| UK average pass rate | 79.1% |
| Rank by pass rate | 176 of 386 |

## Defects by area

Each area's share of all defects and advisories recorded (failure items and advisories).

| Area | Share of all items |
| --- | ---: |
| Tyres | 29.7% |
| Brakes | 27.7% |
| Lights | 10.6% |
| Suspension | 9.6% |
| Other | 8% |
| Bodywork | 4.8% |
| Windscreen | 4% |
| Corrosion | 1.4% |
| Steering | 1.2% |
| Exhaust | 1% |
| Fuel | 0.8% |
| Electrical | 0.8% |
| Structure | 0.3% |
| Drivetrain | 0% |

## Fail rate by mileage

| Recorded mileage | Tests | Fail rate |
| --- | ---: | ---: |
| Under 40,000 miles | 4,331 | 11.4% |
| 40,000 to 79,999 miles | 5,153 | 20.5% |
| 80,000 to 119,999 miles | 2,270 | 29.8% |
| 120,000 miles and over | 550 | 33.8% |

## Fail rate by year of manufacture

| Year | Tests | Fail rate |
| --- | ---: | ---: |
| 2005 | 83 | 24.1% |
| 2006 | 604 | 25.3% |
| 2007 | 524 | 26.7% |
| 2008 | 877 | 27% |
| 2009 | 1,047 | 24.3% |
| 2010 | 1,137 | 22.2% |
| 2011 | 833 | 25.5% |
| 2012 | 1,098 | 17.9% |
| 2013 | 1,219 | 19.2% |
| 2014 | 1,682 | 16.1% |
| 2015 | 1,112 | 14% |
| 2016 | 848 | 14.3% |
| 2017 | 865 | 12.8% |
| 2018 | 339 | 13% |
| 2019 | 57 | 21.1% |

## Source and citation

Data period: MOT tests completed 2004 to 2026. Figures last computed 3 October 2026.

Source: DVSA MOT testing data for Great Britain (https://www.gov.uk/government/collections/mot-testing-data-for-great-britain), aggregated by CarBuyerIQ. Contains public sector information licensed under the Open Government Licence v3.0.

Cite as: CarBuyerIQ, "Mercedes-Benz B-Class MOT pass rate", https://www.carbuyeriq.com/mot-pass-rates/mercedes-benz/b-class

Full dataset (CC BY 4.0): https://www.carbuyeriq.com/data