Mercedes-Benz Ml years to avoid — 92,163 MOT tests ranked

Inspect most carefully: 2003. Strongest in the data: 2012 or 2013. The ranking uses 92,163 MOT tests across 14 registration years (2023–2025) and compares each year with all UK cars of the same age. Fuel-type signal: diesels show an average 3.9-point pass-rate deficit on this model. That may reflect mileage and use as well as the car itself, so inspect DPF and emissions history rather than treating fuel type as a verdict.

Every Ml 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.

RankYearIndexVs same-agePass rateTests
1 2013 Strong 111.2 +11.2 pts 84.5% 12,482
2 2012 Strong 110.0 +10.0 pts 81.3% 6,773
3 2006 109.7 +9.7 pts 74.1% 5,315
4 2007 108.8 +8.8 pts 74.0% 6,332
5 2008 108.5 +8.5 pts 73.7% 6,628
6 2014 108.2 +8.2 pts 84.0% 11,425
7 2015 107.1 +7.1 pts 85.8% 9,422
8 2009 106.9 +6.9 pts 73.3% 5,891
9 2011 106.4 +6.4 pts 75.6% 7,665
10 2010 106.3 +6.3 pts 73.7% 7,737
11 2002 103.2 +3.2 pts 68.9% 2,631
12 2005 103.1 +3.1 pts 67.5% 2,954
13 2004 101.7 +1.7 pts 66.0% 3,990
14 2003 Inspect 100.0 -0.0 pts 64.9% 2,918

Why 2003 rank lower

The 2003 cohort passes 64.9% of tests (-0.0 points versus same-age cars) at a median 129,430 miles, with lamps, reflectors and electrical equipment 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 2003 example beats a neglected 2012 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.
  • Fuel matters on this model. The diesel deficit (3.9 points) usually traces to DPF and emissions kit on low-mileage use — check for P2463-type soot codes on the test drive.
  • Scan before you pay. A 2-minute OBD scan reveals stored faults the dashboard hides — see our scanner guide.

FAQs

Which Ml years should I avoid?

Based on 92,163 MOT tests adjusted against cars of the same age, 2003 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 Ml year to buy used?

2012 and 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 Ml reliable overall?

Across 92,163 tests, the median age-adjusted index is 107.0 (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.