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Audi A4 vs Audi A6 s line tdi auto: reliability comparison

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

Audi A4
76%
MOT pass rate · 568,515 vehicles
Audi A6 s line tdi auto
83%
MOT pass rate · 30 vehicles
Verdict: On MOT pass rate the Audi A4 (76%) and Audi A6 s line tdi auto (83%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Audi A4 Audi A6 s line tdi auto
MOT pass rate 76% 83% ✓
MOT failure rate 24% 17% ✓
Faults & advisories per test 1.9 0.1 ✓
Dangerous-fault share 2% 0% ✓
Average mileage 133,841 mi 190,884 mi
Sample size (vehicles) 568,515 30

Most common faults

Audi A4

  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 Rear Tyre worn close to the legal limit (4.1.E.1)
  4. Offside Rear Tyre worn close to the legal limit (4.1.E.1)
  5. Under-trays fitted obscuring some underside components
  6. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))

Audi A6 s line tdi auto

  1. Windscreen has damage to an area less than a 10mm circle within zone 'A' (8.3.1a)
  2. Slight knock from steering.
  3. Nearside Front Drive shaft joint constant velocity boot severely deteriorated (6.1.7 (g) (i))
  4. Offside Front Tyre worn close to the legal limit (4.1.E.1)
  5. Nearside Front Tyre has ply or cords exposed (4.1.D.1b)
  6. Offside Rear Passenger's seat cannot be secured in the upright position. (6.2.A.2)

Reliability FAQ

On MOT pass rate the Audi A4 (76%) and Audi A6 s line tdi auto (83%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Audi A4 report Full Audi A6 s line tdi auto 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.