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Mercedes-benz E vs Mercedes-benz Unknown: reliability comparison

MOT pass rates, common faults and mileage compared from real UK MOT data.

Mercedes-benz E
79%
MOT pass rate · 429,719 vehicles
Mercedes-benz Unknown
85%
MOT pass rate · 77,285 vehicles
More reliable
Verdict: On MOT pass rate, the Mercedes-benz Unknown is the more reliable of the two — 85% pass first time versus 79%. It's one signal among several; check the full breakdown below.

Head to head

Measure Mercedes-benz E Mercedes-benz Unknown
MOT pass rate 79% 85% ✓
MOT failure rate 21% 15% ✓
Faults & advisories per test 1.6 1.1 ✓
Dangerous-fault share 3% 3%
Average mileage 124,278 mi 145,790 mi
Sample size (vehicles) 429,719 77,285

Most common faults

Mercedes-benz E

  1. Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
  2. Offside Rear Tyre worn close to the legal limit (4.1.E.1)
  3. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  4. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  5. Nearside Front Tyre worn close to the legal limit (4.1.E.1)
  6. Offside Front Tyre worn close to the legal limit (4.1.E.1)

Mercedes-benz Unknown

  1. Oil leak, but not excessive (8.4.1 (a) (i))
  2. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  4. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  5. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  6. Windscreen damaged but not adversely affecting driver's view (3.2 (a) (i))

Reliability FAQ

On MOT pass rate, the Mercedes-benz Unknown is the more reliable of the two — 85% pass first time versus 79%. It's one signal among several; check the full breakdown below.

Full Mercedes-benz E report Full Mercedes-benz Unknown report Most reliable cars

Pass rates are computed over completed (pass/fail) MOT tests. Reliability also depends on age, mileage and upkeep — see each model's page for the full picture.