2022 Mercedes-Benz B-Class — MOT failures & pass rate
1,517 MOT tests on the 2022 Mercedes-Benz B-Class are in this dataset, and 93.6% of them passed. MPVs of a similar age fail 10.3% of the time, so this is 3.9pp better than the group it competes with. Failures cluster in tyres, visibility and lighting & signalling.
What the MOT record shows
No single area dominates — tyres (4.3%) and visibility (1.6%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are headlamp aim, wipers and tread depth — headlamp aim alone was recorded 22 times.
Mileage matters less than usual here: the 2022 B-Class fails 5.6% of the time in the 0-30k band and 7.5% at 60-90k, a spread of only 2.0 points.
Advisories point at the next bill rather than this one: tyres was flagged on 16.0% of tests without failing them.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 4.3% | 65 |
| 2 | Visibility | 1.6% | 24 |
| 3 | Lighting & signalling | 1.4% | 21 |
| 4 | Seat belts & restraints | 0.5% | 7 |
| 5 | Suspension | 0.5% | 7 |
| 6 | Brakes | 0.3% | 5 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Headlamp aim | 22 |
| 2 | Wipers | 21 |
| 3 | Tread depth | 7 |
| 4 | Washers | 6 |
| 5 | Malfunction indicator lamp | 5 |
| 6 | Ball joint | 5 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Tyres | 16.0% | 243 |
| 2 | Brakes | 4.0% | 60 |
| 3 | Other defects | 3.6% | 54 |
| 4 | Visibility | 2.9% | 44 |
| 5 | Suspension | 2.0% | 31 |
| 6 | Road wheels | 0.7% | 11 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 0-30k | 1,077 | 5.6% |
| 30-60k | 384 | 8.6% |
| 60-90k | 53 | 7.5% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Petrol | 971 | 6.3% |
| Diesel | 400 | 6.8% |
| Hybrid | 146 | 6.2% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2024 | 131 | 6.1% |
| 2025 | 1,382 | 6.4% |
What to check before buying a 2022 B-Class
On a 2022 B-Class, tyres is what the MOT record says goes wrong most — it appeared in 4.3% of tests. Check these areas before you commit.
- Tyres (4.3% of tests): Usually a quick, known-cost fix, but check tread, age and uneven wear (which can hint at alignment or suspension issues). Typical repair: £50–£120 per tyre.
- Visibility (1.6% of tests): Wipers, washers, mirrors and screen damage — usually inexpensive, but check for chips in the driver's line of sight. Typical repair: £15–£150.
- Lighting & signalling (1.4% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
Repair costs are rough UK ballpark ranges to set expectations, not quotes — actual prices vary widely by car, parts and garage.
Frequently asked questions
How many 2022 Mercedes-Benz B-Classs pass their MOT?
93.6% of the 1,517 2022 Mercedes-Benz B-Class MOT tests in this dataset passed — a 6.4% fail rate.
What is the most common MOT failure on a 2022 Mercedes-Benz B-Class?
Tyres, recorded in 4.3% of tests, followed by visibility (1.6%).
Does the 2022 B-Class get worse with mileage?
Its MOT fail rate rises from 5.6% in the 0-30k band to 7.5% in the 60-90k band.
Methodology & source. Based on 1,517 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-27. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.