2014 Mercedes-Benz B-Class MOT pass rate, common failures & what to check
In 2025, 71.8% of Mercedes-Benz B-Class cars first used in 2014 passed their MOT first time, against 68.6% for all cars first used in 2014. Across 24,872 B-Class first tests from 2023 to 2025, the most common failure areas were lamps and electrical equipment, suspension and tyres.
This page analyses first MOT tests for Mercedes-Benz B-Class cars first used in 2014 (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 2014 Mercedes-Benz B-Class MOT pass rate has changed
Share of first tests passed in each year, B-Class cars first used in 2014 against all cars first used in 2014 (any make or fuel; not adjusted for mileage, fuel or use). In 2025 the B-Class figure was 3.2 points higher.
View this chart as a table
| Test year | 2014 B-Class | All cars first used 2014 | B-Class first tests |
|---|---|---|---|
| 2021 | 80.5% | 76.3% | 8,396 |
| 2022 | 79.2% | 74.1% | 8,308 |
| 2023 | 75.3% | 71.7% | 8,371 |
| 2024 | 74.1% | 69.9% | 8,292 |
| 2025 | 71.8% | 68.6% | 8,209 |
Common 2014 Mercedes-Benz B-Class MOT failures
Share of the 6,536 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 |
|---|---|---|
| Coil spring: fractured or broken | 14.1% | 922 |
| Registration plate lamp(s): inoperative in the case of a single lamp or all lamps | 11.9% | 780 |
| Linkage ball joint dust cover: ball joint dust cover no longer prevents the ingress of dirt | 10.9% | 712 |
| Tyre condition: has a cut in excess of the requirements deep enough to reach the ply or cords | 7.8% | 508 |
| Malfunction indicator lamp: inoperative or indicates a malfunction | 7.7% | 501 |
Item names are DVSA’s own wording. 2023–2025 combined.
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Typical repair costs for common MOT failures
Typical UK garage prices for the job, not for a B-Class in particular, and not a quote.
| Failure item | Typical job | Typical UK price | Usual range |
|---|---|---|---|
| Coil spring: fractured or broken | Coil spring replacement | £248 | £175–£400 |
From published UK repair-cost guides, checked September 2026. Only jobs with a published typical price are shown.
What to check on a 2014 Mercedes-Benz B-Class before buying
The three areas where failed first tests most often had a fault, 2023–2025.
- Lamps and electrics. Ask someone to watch while you work the brake lights, indicators, sidelights, dipped and main beam, and the number-plate lamps.
- Suspension. Worth looking behind the front wheels with a torch at the coil springs, and listening for knocks over bumps on the test drive.
- Tyres. Worth checking the tread depth across the whole width of each tyre, and the sidewalls for cuts, cracks and bulges.
Common 2014 Mercedes-Benz B-Class MOT advisories
Advisories are points the tester noted that did not fail the car. Most common on 2014 B-Class cars, as a share of all 24,872 first tests, 2023–2025.
| DVSA advisory item | Share of first tests | Tests |
|---|---|---|
| Tread depth: worn close to legal limit/worn on edge | 15.3% | 3,816 |
| Tyre condition: slightly damaged/cracking or perishing | 9.3% | 2,309 |
| Brake pads: wearing thin | 8.6% | 2,149 |
| Brake discs: worn, pitted or scored, but not seriously weakened | 7.8% | 1,935 |
| Brake discs: worn, but not excessively | 4.4% | 1,105 |
Questions about the 2014 Mercedes-Benz B-Class MOT
What is the MOT pass rate of a 2014 Mercedes-Benz B-Class?
In 2025, 71.8% of B-Class cars first used in 2014 passed their MOT first time, against 68.6% for all cars first used in 2014. A car fixed during the test counts as a fail.
What does a 2014 B-Class most often fail its MOT on?
Lamps and electrical equipment (in 35.5% of failed first tests, 2023–2025), suspension (32.0%) and tyres (29.4%). The single most common item was “Coil spring: fractured or broken” (14.1%).
How often does a 2014 Mercedes-Benz B-Class fail its MOT?
In 2025, 28.2% of first tests on B-Class cars first used in 2014 did not pass first time: 23.3% failed, and a further 4.9% had a fault fixed during the test (counted as a fail here). Across 2023–2025, 6,536 of 24,872 first tests did not pass first time.
What are the most common 2014 Mercedes-Benz B-Class MOT advisories?
“Tread depth: worn close to legal limit/worn on edge” (on 15.3% of first tests, 2023–2025), “Tyre condition: slightly damaged/cracking or perishing” (9.3%), “Brake pads: wearing thin” (8.6%), “Brake discs: worn, pitted or scored, but not seriously weakened” (7.8%) and “Brake discs: worn, but not excessively” (4.4%).
Is a 2014 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 80.5% in 2021 to 71.8% in 2025. For one particular car, its own MOT history matters more than the average.
Other cars first used in 2014
The most-tested cars from the same year. Each page uses the same method.
2014 Ford Fiesta MOT statistics · 2014 Vauxhall Corsa MOT statistics · 2014 Ford Focus MOT statistics · 2014 Volkswagen Golf MOT statistics · 2014 Vauxhall Astra MOT statistics
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