BMW 420 years to avoid — 184,624 MOT tests ranked
Every 420 year, ranked
The age-adjusted MOT index sets 100 as the pass rate of all UK cars registered in the same year and tested in the same calendar year. Higher is better. This prevents an old car being labelled a “bad year” simply because it is old.
| Rank | Year | Index | Vs same-age | Pass rate | Tests |
|---|---|---|---|---|---|
| 1 | 2013 Strong | 106.2 | +6.2 pts | 79.5% | 1,650 |
| 2 | 2015 | 104.6 | +4.6 pts | 83.3% | 30,312 |
| 3 | 2014 | 104.5 | +4.5 pts | 80.3% | 22,950 |
| 4 | 2016 | 104.2 | +4.2 pts | 85.6% | 33,734 |
| 5 | 2017 | 102.7 | +2.7 pts | 86.7% | 33,477 |
| 6 | 2018 | 101.0 | +1.0 pts | 87.4% | 30,456 |
| 7 | 2020 Inspect | 99.4 | -0.6 pts | 89.3% | 9,404 |
| 8 | 2019 Inspect | 98.9 | -1.1 pts | 87.3% | 22,641 |
Why 2019 and 2020 rank lower
The 2020 cohort passes 89.3% of tests (-0.6 points versus same-age cars) at a median 29,748 miles, with tyres the leading failure system. The 2019 cohort passes 87.3% of tests (-1.1 points versus same-age cars) at a median 39,105 miles, with tyres the leading failure system. This is population-level evidence, not a known-fault list: service history, engine version and the individual MOT record can outweigh the registration-year average.
How to use this before buying
- Rankings describe the cohort, not the car. A cherished 2019 example beats a neglected 2013 one — always run the specific reg through the free MOT history check.
- Read the advisories. Repeated notes for the same component across years mean the owner has been ignoring it. Decode them in our advisory library.
- Scan before you pay. A 2-minute OBD scan reveals stored faults the dashboard hides — see our scanner guide.
FAQs
Which 420 years should I avoid?
Based on 184,624 MOT tests adjusted against cars of the same age, 2019, 2020 are the lower-scoring outliers. That is a prompt for closer inspection, not proof that every car from those years is bad.
What is the best 420 year to buy used?
2013 lead the age-adjusted MOT ranking. The score compares each registration year with all UK cars of the same age; the specific car's history and condition still take priority.
Is the 420 reliable overall?
Across 184,624 tests, the median age-adjusted index is 103.5 (100 equals the pass rate of all cars registered in the same year). Use the spread between years as one signal, then check the individual registration.
Methodology: index = 100 + the model-year cohort’s MOT pass-rate difference versus all UK vehicles registered in the same year and tested in the same calendar year. Class 4 initial tests only; retests excluded; at least 1,500 tests per page. “Inspect” years are below both the same-age baseline and the model’s median index by at least 2 points. Association is not proof of a model-year defect. DVSA anonymised data 2023–2025, OGL v3.0.