2019 Mercedes-Benz B-Class MOT pass rate, common failures & what to check
In 2025, 89.2% of Mercedes-Benz B-Class cars first used in 2019 passed their MOT first time, against 83.5% for all cars first used in 2019. Across 12,925 B-Class first tests from 2023 to 2025, the most common failure areas were tyres, lamps and electrical equipment and seat belts and airbag systems.
This page analyses first MOT tests for Mercedes-Benz B-Class cars first used in 2019 (all trims grouped): 2021 to 2025 for the pass-rate trend, and 2023 to 2025 for the failure and advisory analysis — plus what is worth checking before you buy one.
Data: DVSA anonymised MOT tests to December 2025 · Calculated by SortedCars · Updated October 2026
How the 2019 Mercedes-Benz B-Class MOT pass rate has changed
Share of first tests passed in each year, B-Class cars first used in 2019 against all cars first used in 2019 (any make or fuel; not adjusted for mileage, fuel or use). In 2025 the B-Class figure was 5.7 points higher.
View this chart as a table
| Test year | 2019 B-Class | All cars first used 2019 | B-Class first tests |
|---|---|---|---|
| 2021 | fewer than 500 tests | 89.2% | 123 |
| 2022 | 91.9% | 87.8% | 4,320 |
| 2023 | 90.2% | 86.2% | 4,317 |
| 2024 | 89.3% | 84.9% | 4,304 |
| 2025 | 89.2% | 83.5% | 4,304 |
Common 2019 Mercedes-Benz B-Class MOT failures
Share of the 1,350 failed first tests (2023–2025) with at least one failure in each area. A test can fail in more than one area, so the shares add up to more than 100%.
Most common failure items
| DVSA failure item | Share of failed first tests | Tests |
|---|---|---|
| Tyre condition: has a cut in excess of the requirements deep enough to reach the ply or cords | 19.6% | 265 |
| SRS malfunction indicator lamp: warning lamp indicates a fault | 11.0% | 149 |
| Tread depth: below requirements of 1.6mm | 9.3% | 125 |
| Wipers: does not clear the windscreen effectively | 8.3% | 112 |
| Tyre condition: has ply or cords exposed | 8.1% | 109 |
Item names are DVSA’s own wording. 2023–2025 combined.
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What to check on a 2019 Mercedes-Benz B-Class before buying
The three areas where failed first tests most often had a fault, 2023–2025.
- Tyres. Worth checking the tread depth across the whole width of each tyre, and the sidewalls for cuts, cracks and bulges.
- Lamps and electrics. Ask someone to watch while you work the brake lights, indicators, sidelights, dipped and main beam, and the number-plate lamps.
- Seat belts and airbags. Worth pulling each seat belt out fully and letting it retract, and checking that the airbag warning light goes out after starting.
Common 2019 Mercedes-Benz B-Class MOT advisories
Advisories are points the tester noted that did not fail the car. Most common on 2019 B-Class cars, as a share of all 12,925 first tests, 2023–2025.
| DVSA advisory item | Share of first tests | Tests |
|---|---|---|
| Tread depth: worn close to legal limit/worn on edge | 11.8% | 1,525 |
| Tyre condition: slightly damaged/cracking or perishing | 8.5% | 1,102 |
| Brake pads: wearing thin | 5.0% | 651 |
| Brake discs: worn, pitted or scored, but not seriously weakened | 2.3% | 302 |
| Brake discs: worn, but not excessively | 2.2% | 282 |
Questions about the 2019 Mercedes-Benz B-Class MOT
What is the MOT pass rate of a 2019 Mercedes-Benz B-Class?
In 2025, 89.2% of B-Class cars first used in 2019 passed their MOT first time, against 83.5% for all cars first used in 2019. A car fixed during the test counts as a fail.
What does a 2019 B-Class most often fail its MOT on?
Tyres (in 45.0% of failed first tests, 2023–2025), lamps and electrical equipment (17.9%) and seat belts and airbag systems (14.4%). The single most common item was “Tyre condition: has a cut in excess of the requirements deep enough to reach the ply or cords” (19.6%).
How often does a 2019 Mercedes-Benz B-Class fail its MOT?
In 2025, 10.8% of first tests on B-Class cars first used in 2019 did not pass first time: 9.0% failed, and a further 1.8% had a fault fixed during the test (counted as a fail here). Across 2023–2025, 1,350 of 12,925 first tests did not pass first time.
What are the most common 2019 Mercedes-Benz B-Class MOT advisories?
“Tread depth: worn close to legal limit/worn on edge” (on 11.8% of first tests, 2023–2025), “Tyre condition: slightly damaged/cracking or perishing” (8.5%), “Brake pads: wearing thin” (5.0%), “Brake discs: worn, pitted or scored, but not seriously weakened” (2.3%) and “Brake discs: worn, but not excessively” (2.2%).
Is a 2019 Mercedes-Benz B-Class reliable?
An MOT pass rate shows what failed at the test, not how reliable a car is. For this group of cars the first-time pass rate went from 91.9% in 2022 to 89.2% in 2025. For one particular car, its own MOT history matters more than the average.
Other cars first used in 2019
The most-tested cars from the same year. Each page uses the same method.
2019 Ford Fiesta MOT statistics · 2019 Volkswagen Golf MOT statistics · 2019 Ford Focus MOT statistics · 2019 Vauxhall Corsa MOT statistics · 2019 Mercedes-Benz A-Class MOT statistics
Checking a specific 2019 B-Class?
The numbers above cover every B-Class first used in 2019 and tested in Great Britain. Our free check shows the actual MOT history, mileage record and tax status of the one you are looking at.
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