MOT Risk Index.co.uk

Does the Mercedes-Benz 420 fail the MOT on suspension more than it should?

The Mercedes-Benz 420 records 19.76 suspension failure items per 100 initial MOT tests (2019–2024), against 19.39 expected for a car of the same age mix: about as expected for its class and age (the difference is within its interval or under 0.5 items per 100 tests) (+0.37, 95% interval −1.14 to +1.88). It ranks 247 of 701 models on suspension (1 = most failures above expected).

Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · all models on suspension · check a Mercedes-Benz 420 by registration

What exactly fails on suspension?

The most frequent DVSA defect wording in this group on the Mercedes-Benz 420 is “A suspension joint dust cover severely deteriorated”, recorded 271 times in 2019–2024.

Mercedes-Benz 420: most frequent suspension defect wordings, 2019–2024 (30+ items each)
DVSA defect wordingItemsPer 100 tests
A suspension joint dust cover severely deteriorated2718.16
A suspension joint dust cover missing or no longer prevents the ingress of dirt etc1464.40
The strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired1273.83
A suspension pin, bush or joint excessively worn451.36

Source: DVSA MOT bulk data (OGL v3.0) · Window: 2019–2024 · n = 3,320 (initial tests) · Method: failure items (major and minor) grouped by DVSA's defect tree; wordings with 30+ items · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

Other pages for this model

Mercedes-Benz 420 by postcode area · Mercedes-Benz 420 body, chassis and structure failures · Mercedes-Benz 420 brakes failures · Mercedes-Benz 420 lamps, reflectors and electrics failures · Mercedes-Benz 420 noise, emissions and leaks failures · Mercedes-Benz 420 steering failures · Mercedes-Benz 420 tyres failures · Mercedes-Benz 420 visibility failures