Mercedes-Benz ML300 MOT reliability

Mercedes-Benz ML300s passed their MOT first time 67% of the time across 45 tests in 2025.

These figures come from 45 MOT tests. That's a fairly small number of cars, so they may not be typical of these cars as a whole.

First-time pass rate

67%

MOTs analysed

45

Still licensed (GB)

–

Body type

–

Pass rate by year of first registration

Older cars fail more often, so compare a car with others of the same age. Years with very few MOTs can show extreme pass rates, even 0% or 100%, so give more weight to years with more tests.

In detail:

First registered

2009 diesel

11 MOTs

These figures come from only 11 MOT tests. With so few cars, a single pass or fail changes the percentages a lot, so treat them as a rough guide rather than a true average.

Passed first time 46%. Typical mileage 122,679 (most between 116,140 and 155,652).

2012: 93% → 2013: 81% → 2014: 73% → 2015: 76% → 2016: 73% → 2017: 78% → 2018: 67% → 2019: 82% → 2020: 71% → 2021: 81% → 2022: 59% → 2023: 65% → 2024: 86% → 2025: 46%

Most common failures

Rbt (sp): efficiency below requirements (18.2%)
Coil spring: fractured or broken (9.1%)
Condition: buckle not functioning as intended (9.1%)
Engine oil leaks: leaking excessively from engine (9.1%)
Service brake performance: excessively binding (9.1%)

Where 2009 ML300s fail

Brakes

27.3%

Lights & electrics

18.2%

Exhaust, emissions & leaks

18.2%

Body, structure & corrosion

9.1%

Wheels & tyres

9.1%

Seat belts & other equipment

9.1%

Suspension & axles

9.1%

Looking at a particular car?

See its own MOT history, mileage and red flags, compared with these figures. Free.

Based on 2025 initial MOT tests in DVSA's anonymised MOT dataset (cars and light vans). Contains public sector information licensed under the Open Government Licence v3.0. Model details: Vehicle data by VehiclesDB.