Skip to content

Audi A6 vs Audi S5 fsi quattro: 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 S5 fsi quattro
80%
MOT pass rate · 4 vehicles
Verdict: On MOT pass rate the Audi A6 (78%) and Audi S5 fsi quattro (80%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Audi A6 Audi S5 fsi quattro
MOT pass rate 78% 80% ✓
MOT failure rate 22% 20% ✓
Faults & advisories per test 1.7 0.2 ✓
Dangerous-fault share 2% 0% ✓
Average mileage 136,441 mi 121,586 mi
Sample size (vehicles) 246,602 4

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 S5 fsi quattro

  1. Nearside Headlamp aim too high (1.8)
  2. Offside Headlamp aim too high (1.8)
  3. Nearside Rear Tyre has a cut in excess of the requirements deep enough to reach the ply or cords (4.1.D.1a)
  4. Nearside Headlamp aim too low (4.1.2 (a))
  5. Offside Headlamp aim too low (4.1.2 (a))
  6. Rear Brake pad(s) wearing thin both side (1.1.13 (a) (ii))

Reliability FAQ

On MOT pass rate the Audi A6 (78%) and Audi S5 fsi quattro (80%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Audi A6 report Full Audi S5 fsi quattro 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.