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Audi A6 vs Audi A8 s line 50tdi mhev quattro a: reliability comparison

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

Audi A6
78%
MOT pass rate · 246,602 vehicles
Audi A8 s line 50tdi mhev quattro a
88%
MOT pass rate · 31 vehicles
Verdict: On MOT pass rate the Audi A6 (78%) and Audi A8 s line 50tdi mhev quattro a (88%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Audi A6 Audi A8 s line 50tdi mhev quattro a
MOT pass rate 78% 88% ✓
MOT failure rate 22% 12% ✓
Faults & advisories per test 1.7 0.7 ✓
Dangerous-fault share 2% ✓ 10%
Average mileage 136,441 mi 48,052 mi
Sample size (vehicles) 246,602 31

Most common faults

Audi A6

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

Audi A8 s line 50tdi mhev quattro a

  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. Front Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii))
  4. Engine MIL inoperative or indicates a malfunction (8.2.2.2 (g))
  5. Registration plate inscription illegible both (0.1 (b))
  6. Front Tyre has a tear, caused by separation or partial failure of its structure both sides (5.2.3 (d) (ii))

Reliability FAQ

On MOT pass rate the Audi A6 (78%) and Audi A8 s line 50tdi mhev quattro a (88%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Audi A6 report Full Audi A8 s line 50tdi mhev quattro 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.