Ci Mercedes-Benz MOT reliability

Ci Mercedes-Benzs passed their MOT first time 81% of the time across 16 tests in 2025.

These figures come from only 16 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

81%

MOTs analysed

16

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

2004 diesel

8 MOTs

Passed first time 75%. Typical mileage 55,847 (most between 39,164 and 64,086).

2007: 86% → 2008: 71% → 2009: 100% → 2010: 100% → 2011: 100% → 2012: 80% → 2013: 100% → 2014: 88% → 2015: 100% → 2016: 100% → 2017: 90% → 2018: 75% → 2019: 89% → 2020: 83% → 2021: 100% → 2022: 88% → 2023: 75% → 2024: 67% → 2025: 75%

Most common failures

Headlamp aim: too low (12.5%)
Individual direction indicators: not working (12.5%)
Rbt (sp): efficiency below requirements (12.5%)
Rigid brake pipes: excessively corroded (12.5%)
Wipers: does not clear the windscreen effectively (12.5%)

Where 2004 Mercedes-Benzs fail

Brakes

12.5%

Lights & electrics

12.5%

Visibility & wipers

12.5%

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.