Mercedes-Benz 400 MOT reliability

Mercedes-Benz 400s passed their MOT first time 79% of the time across 19 tests in 2025.

Example photo of a Mercedes-Benz 400 — Photo: Unknown author · CC BY-SA 3.0 · Wikimedia Commons

These figures come from only 19 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

79%

MOTs analysed

19

Still licensed (GB)

–

Body type

Sedan

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

2015 hybrid

1 MOT

Passed first time 100%. Typical mileage 72,007 (most between 72,007 and 72,007).

2018: 100% → 2019: 100% → 2020: 100% → 2021: 100% → 2022: 100% → 2023: 100% → 2024: 100% → 2025: 100%

Most common failures

Looking at a particular car?

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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.