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Mercedes-benz C vs Mercedes-benz S 400 l amg ln prm+exec d 4m a: 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 S 400 l amg ln prm+exec d 4m a
92%
MOT pass rate · 32 vehicles
Verdict: On MOT pass rate the Mercedes-benz C (78%) and Mercedes-benz S 400 l amg ln prm+exec d 4m a (92%) 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 S 400 l amg ln prm+exec d 4m a
MOT pass rate 78% 92% ✓
MOT failure rate 22% 8% ✓
Faults & advisories per test 1.7 0.6 ✓
Dangerous-fault share 3% ✓ 12%
Average mileage 112,156 mi 55,115 mi
Sample size (vehicles) 675,043 32

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 S 400 l amg ln prm+exec d 4m a

  1. Front Brake pad(s) wearing thin (1.1.13 (a) (ii))
  2. Nearside Front Suspension arm ball joint has slight play spring link (5.3.4 (a) (i))
  3. Offside Rear Outer Tyre slightly damaged wall (5.2.3 (d) (ii))
  4. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  5. Nearside Rear Inner Tyre worn close to legal limit/worn on edge edge (5.2.3 (e))
  6. Offside Rear Inner Tyre worn close to legal limit/worn on edge edge (5.2.3 (e))

Reliability FAQ

On MOT pass rate the Mercedes-benz C (78%) and Mercedes-benz S 400 l amg ln prm+exec d 4m a (92%) 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 S 400 l amg ln prm+exec d 4m a 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.