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Audi A6 vs Audi R s4: 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 R s4
71%
MOT pass rate · 1 vehicles
Verdict: On MOT pass rate the Audi A6 (78%) and Audi R s4 (71%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Audi A6 Audi R s4
MOT pass rate 78% ✓ 71%
MOT failure rate 22% ✓ 29%
Faults & advisories per test 1.7 ✓ 3.4
Dangerous-fault share 2% ✓ 4%
Average mileage 136,441 mi 100,533 mi
Sample size (vehicles) 246,602 1

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 R s4

  1. Nearside Front Shock absorbers has light misting of oil (5.3.2 (b))
  2. Offside Front Shock absorbers has light misting of oil (5.3.2 (b))
  3. Nearside Front Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
  4. Nearside Rear Tyre slightly damaged/cracking or perishing perished (5.2.3 (d) (ii))
  5. Offside Front Coil spring corroded (5.3.1 (b) (i))
  6. Offside Rear Coil spring corroded (5.3.1 (b) (i))

Reliability FAQ

On MOT pass rate the Audi A6 (78%) and Audi R s4 (71%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Audi A6 report Full Audi R s4 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.