Mercedes-Benz R-Class MOT pass rate: 77.6% (1,724 tests, 2025)

The Mercedes-Benz R-Class passed 77.6% of its 1,724 MOT tests in 2025 — right on the UK average of 77.5%. The median tested example was 15 years old with 122,349 miles on the clock.

77.6%Pass rate (2025)

1,724MOT tests analysed

122,349 miMedian mileage at test

15 yrsMedian age at test

How the R-Class compares

Mercedes-Benz R-Class

77.6%

UK average (all Class 4 vehicles)

77.5% across 33.1 million tests

Mercedes-Benz average (all models)

80.7%

What fails most on the Mercedes-Benz R-Class

Across failed and rectified tests in 2025, these vehicle systems produced the most defects on the R-Class:

#	System	Defects recorded	Share
1	Brakes	328	34.8%
2	Lamps, reflectors and electrical equipment	218	23.1%
3	Body, chassis, structure	123	13.0%
4	Tyres	97	10.3%
5	Suspension	89	9.4%
6	Noise, emissions and leaks	88	9.3%

Pre-MOT checklist for R-Class owners

Based on the failure profile above, ten minutes with a torch before your test removes the most likely fail items:

Feel for a spongy pedal or pulling to one side; check pad wear through the wheel spokes if visible
Walk round with all lights on: one blown bulb is the most avoidable fail there is
Look underneath for corrosion around sills and subframes, especially on older cars
Check tread with the 20p test and inspect sidewalls for cracking — tyres close to the limit are the country’s most common advisory
Bounce each corner and listen for clonks over speed bumps — suspension is this model’s (and the UK’s) top failure system

Check the engine before the tester does

A stored fault code with the engine light on is an automatic Major defect. Scan and clear resolved faults before booking.

Topdon OBD2 scannersTopdon diagnostic scanners with full-system readouts
XTOOL diagnostic toolsXTOOL code readers for petrol and diesel cars
Autel UK testersAutel professional-grade diagnostic testers

Check a specific R-Class before you buy

Pass rates describe the model; they can’t tell you about the one car you’re looking at. Run its plate through our free MOT history check to see its personal record of failures, advisories and mileage readings.

Other Mercedes-Benz models

C78.2% pass rate · 343,551 tests A-Class77.8% pass rate · 232,671 tests E79.7% pass rate · 215,896 tests A89.1% pass rate · 93,733 tests Vito73.4% pass rate · 81,263 tests GLC87.2% pass rate · 65,847 tests GLA83.1% pass rate · 64,404 tests CLA82.7% pass rate · 62,279 tests

FAQs

What is the MOT pass rate for a Mercedes-Benz R-Class?

In 2025, 77.6% of 1,724 first MOT tests on the Mercedes-Benz R-Class were passes (UK average: 77.5%). Data: DVSA anonymised MOT results.

What does the R-Class fail its MOT on most?

The biggest defect group is brakes (34.8% of its recorded defects), followed by lamps, reflectors and electrical equipment.

Is the Mercedes-Benz R-Class reliable?

MOT pass rate is one lens on durability: at 77.6% it performs above the national average at a median age of 15 years and 122,349 miles. Always check the individual car's history too.

Source: DVSA Anonymised MOT tests and results, 2025 extract (Class 4 initial tests only; retests excluded). Contains public sector information licensed under the Open Government Licence v3.0. Figures rounded to one decimal place.