2021 Mercedes-Benz Amg Cla 35 + 4Matic A — MOT failures & pass rate
345 MOT tests on the 2021 Mercedes-Benz Amg Cla 35 + 4Matic A are in this dataset, and 87.8% of them passed. Against all cars of a similar age (8.6% fail rate), the 2021 Amg Cla 35 + 4Matic A comes out 3.6pp worse. Failures cluster in tyres, other defects and lighting & signalling.
What the MOT record shows
Tyres dominates the failure mix at 9.0% of all tests — 7.2 points clear of other defects, so it is the first thing to check.
At component level the recurring items are registration plates, headlamp aim and wipers — registration plates alone was recorded 9 times.
Advisories point at the next bill rather than this one: tyres was flagged on 18.8% of tests without failing them.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 9.0% | 31 |
| 2 | Other defects | 1.7% | 6 |
| 3 | Lighting & signalling | 1.7% | 6 |
| 4 | Road wheels | 1.5% | 5 |
| 5 | Visibility | 1.2% | 4 |
| 6 | Brakes | 1.2% | 4 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Registration plates | 9 |
| 2 | Headlamp aim | 8 |
| 3 | Wipers | 4 |
| 4 | Brake pads | 3 |
| 5 | Headlamp levelling device | 2 |
| 6 | Door condition | 1 |
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 | 18.8% | 65 |
| 2 | Brakes | 10.1% | 35 |
| 3 | Other defects | 5.2% | 18 |
| 4 | Visibility | 3.5% | 12 |
| 5 | Suspension | 1.2% | 4 |
| 6 | Lighting & signalling | 0.9% | 3 |
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 | 210 | 10.0% |
| 30-60k | 128 | 16.4% |
Failure rate by age
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2024 | 173 | 12.7% |
| 2025 | 162 | 11.7% |
What to check before buying a 2021 Amg Cla 35 + 4Matic A
On a 2021 Amg Cla 35 + 4Matic A, tyres is what the MOT record says goes wrong most — it appeared in 9.0% of tests. Check these areas before you commit.
- Tyres (9.0% 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.
- Other defects (1.7% of tests): Miscellaneous items not in the main categories. Typical repair: varies.
- Lighting & signalling (1.7% 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 2021 Mercedes-Benz Amg Cla 35 + 4Matic As pass their MOT?
87.8% of the 345 2021 Mercedes-Benz Amg Cla 35 + 4Matic A MOT tests in this dataset passed — a 12.2% fail rate.
What is the most common MOT failure on a 2021 Mercedes-Benz Amg Cla 35 + 4Matic A?
Tyres, recorded in 9.0% of tests, followed by other defects (1.7%).
Does the 2021 Amg Cla 35 + 4Matic A get worse with mileage?
Its MOT fail rate rises from 10.0% in the 0-30k band to 16.4% in the 30-60k band.
Methodology & source. Based on 345 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.