RegVerdict Model Intelligence
Mercedes-Benz 420 reliability
MOT pass rates & common faults·1,555 DVSA tests·2024
Across 1,555 real DVSA MOT tests in 2024, 81% of Mercedes-Benz 420 cars aged 13 years and older pass their MOT first time, ahead of the 61% average for all cars of that age. It holds up especially well on tyres and suspension.
81%
Strong for its agepass first time (13 years and older)
Strong for its age · beats 88% of peers
+20.4 pts
MOT pass rate by age
13 years and older
1,555 tests · fleet 61%
81%
Where the 420 fails
Suspension98
Brakes97
Body & structure98
Steering99
Tyres99
Lights & electrics96
Holds up better on tyres, suspension, steering.
Share of 13 years and older Mercedes-Benz 420 MOTs with no fault in each area; the marker shows the fleet average. OGL v3.0.
Common questions
Is the Mercedes-Benz 420 reliable?
On 2024 MOT data the Mercedes-Benz 420 holds up well for its age: 81% of examples aged 13 years and older pass first time, against a 61% fleet average. That puts it ahead of 88% of similar-age models.
What is the MOT pass rate for a Mercedes-Benz 420?
First-time MOT pass rates for the Mercedes-Benz 420 in 2024: 13 years and older, 81%. Pass rates fall with age across the whole fleet, so compare each figure with cars of the same age, not with a new car.
What commonly fails on a Mercedes-Benz 420 MOT?
No single area stands out as a recurring weakness for the Mercedes-Benz 420 versus other cars of the same age. Its MOT failures are spread across the usual wear items (tyres, brakes, lamps).
Other Mercedes-Benz models
Check a Mercedes-Benz 420’s full history