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Audi A6 vs Audi Tt 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
More reliable
Audi Tt quattro
76%
MOT pass rate · 59 vehicles
Verdict: On MOT pass rate, the Audi A6 is the more reliable of the two — 78% pass first time versus 76%. It's one signal among several; check the full breakdown below.

Head to head

Measure Audi A6 Audi Tt quattro
MOT pass rate 78% ✓ 76%
MOT failure rate 22% ✓ 24%
Faults & advisories per test 1.7 0.9 ✓
Dangerous-fault share 2% 2%
Average mileage 136,441 mi 116,067 mi
Sample size (vehicles) 246,602 59

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 Tt quattro

  1. Oil leak, but not excessive (8.4.1 (a) (i))
  2. Offside Front Suspension arm rubber bush deteriorated but not resulting in excessive movement (2.4.G.2)
  3. Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
  4. Offside Front Tyre worn close to the legal limit (4.1.E.1)
  5. Steering system has slight free play detected at steering wheel (2.2.A.1b)
  6. Offside Registration plate lamp inoperative in the case of multiple lamps or light sources (4.7.1 (b) (i))

Reliability FAQ

On MOT pass rate, the Audi A6 is the more reliable of the two — 78% pass first time versus 76%. It's one signal among several; check the full breakdown below.

Full Audi A6 report Full Audi Tt 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.