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Mercedes-benz C vs Mercedes-benz C320 cdi: reliability comparison

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

Mercedes-benz C
78%
MOT pass rate · 675,043 vehicles
Mercedes-benz C320 cdi
71%
MOT pass rate · 3 vehicles
Verdict: On MOT pass rate the Mercedes-benz C (78%) and Mercedes-benz C320 cdi (71%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Mercedes-benz C Mercedes-benz C320 cdi
MOT pass rate 78% ✓ 71%
MOT failure rate 22% ✓ 29%
Faults & advisories per test 1.7 ✓ 2.2
Dangerous-fault share 3% 2% ✓
Average mileage 112,156 mi 232,878 mi
Sample size (vehicles) 675,043 3

Most common faults

Mercedes-benz C

  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. Under-trays fitted obscuring some underside components
  6. Nearside Front Tyre worn close to the legal limit (4.1.E.1)

Mercedes-benz C320 cdi

  1. Windscreen has damage to an area less than a 40mm circle outside zone 'A' (8.3.1d)
  2. Under-trays fitted obscuring some underside components
  3. SILL COVERS FITTED
  4. UNDER-TRAYS FITTED
  5. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  6. Front Brake pipe corroded, covered in grease or other material (1.1.11 (c))

Reliability FAQ

On MOT pass rate the Mercedes-benz C (78%) and Mercedes-benz C320 cdi (71%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Mercedes-benz C report Full Mercedes-benz C320 cdi 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.