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Mercedes-benz A-class vs Mercedes-benz G-class: reliability comparison

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

Mercedes-benz A-class
78%
MOT pass rate · 362,612 vehicles
Mercedes-benz G-class
84%
MOT pass rate · 2,147 vehicles
More reliable
Verdict: On MOT pass rate, the Mercedes-benz G-class is the more reliable of the two — 84% pass first time versus 78%. It's one signal among several; check the full breakdown below.

Head to head

Measure Mercedes-benz A-class Mercedes-benz G-class
MOT pass rate 78% 84% ✓
MOT failure rate 22% 16% ✓
Faults & advisories per test 1.6 1.3 ✓
Dangerous-fault share 3% 2% ✓
Average mileage 86,210 mi 64,259 mi
Sample size (vehicles) 362,612 2,147

Most common faults

Mercedes-benz A-class

  1. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  2. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Nearside Front Tyre worn close to the legal limit (4.1.E.1)
  4. Under-trays fitted obscuring some underside components
  5. Offside Front Tyre worn close to the legal limit (4.1.E.1)
  6. Offside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))

Mercedes-benz G-class

  1. Oil leak, but not excessive (8.4.1 (a) (i))
  2. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Front Brake pad(s) wearing thin (1.1.13 (a) (ii))
  4. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  5. Front Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii))
  6. Rear Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii))

Reliability FAQ

On MOT pass rate, the Mercedes-benz G-class is the more reliable of the two — 84% pass first time versus 78%. It's one signal among several; check the full breakdown below.

Full Mercedes-benz A-class report Full Mercedes-benz G-class 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.