Mercedes-Benz 508D MOT reliability

Mercedes-Benz 508Ds passed their MOT first time 20% of the time across 5 tests in 2025.

These figures come from only 5 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.

First-time pass rate

20%

MOTs analysed

5

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

1985 diesel

2 MOTs

Passed first time 0%. Typical mileage 188,033 (most between 168,737 and 207,329).

2005: 0% → 2006: 63% → 2007: 29% → 2008: 0% → 2009: 67% → 2010: 60% → 2011: 60% → 2012: 33% → 2013: 50% → 2014: 25% → 2015: 50% → 2016: 50% → 2017: 100% → 2018: 0% → 2019: 50% → 2020: 50% → 2021: 67% → 2022: 67% → 2023: 100% → 2024: 67% → 2025: 0%

Most common failures

Service brake imbalance: across an axle by more than 50% (50.0%)
Position lamp: not working (50.0%)

Where 1985 508Ds fail

Brakes

50.0%

Lights & electrics

50.0%

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.