2021 Mercedes-Benz Glb 220 AMG Line Prem D 4M A MOT pass rate: 91.5% (1,607 tests)
Is the 2021 Glb 220 AMG Line Prem D 4M A getting worse?
Pass rate of 2021-registered cars across recent test years:
| Test year | Pass rate | |
|---|---|---|
| 2024 | 93.0% +2.3 vs same-age |
|
| 2025 | 90.0% -0.2 vs same-age |
The raw rate normally falls as cars age. The “vs same-age” figure compares this cohort with all UK cars registered in the same year, so normal ageing is not mistaken for a bad model year.
What fails on a 2021 Glb 220 AMG Line Prem D 4M A
| # | System | Defects recorded | Share |
|---|---|---|---|
| 1 | Tyres | 111 | 55.8% |
| 2 | Brakes | 30 | 15.1% |
| 3 | Suspension | 14 | 7.0% |
| 4 | Lamps, reflectors and electrical equipment | 13 | 6.5% |
| 5 | Identification of the vehicle | 8 | 4.0% |
| 6 | Seat belts and supplementary restraint systems | 7 | 3.5% |
All Glb 220 AMG Line Prem D 4M A years compared
| Registration year | Tests | Pass rate | Vs same-age | Median mileage |
|---|---|---|---|---|
| 2020 | 4,479 | 91.0% | +1.1 pts | 33,305 |
| 2021 (this page) | 1,607 | 91.5% | +1.1 pts | 32,658 |
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FAQs
Is a 2021 Mercedes-Benz Glb 220 AMG Line Prem D 4M A reliable?
2021-registered examples passed 91.5% of their MOT tests (1,607 tests, 2023–2025), +1.1 points versus all UK cars registered in the same year. At roughly 5 years old with a median 32,658 miles, condition now varies car by car — always check the individual MOT history.
What mileage is too high for a 2021 Glb 220 AMG Line Prem D 4M A?
The median tested example shows 32,658 miles. Anything far beyond that isn't automatically bad — a motorway-mile car with consistent service records often beats a low-mileage school-run car — but price accordingly and scrutinise the mileage trail for gaps or drops.
Source: DVSA Anonymised MOT tests and results, 2023–2025 extracts (96 million Class 4 initial tests; retests excluded). Only vehicles old enough for a routine first MOT are included. Age-adjusted figures compare the model-year cohort with all vehicles of the same registration year tested in the same calendar year. Contains public sector information licensed under OGL v3.0.