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Audi A4 vs Audi Tt s-line quattro: 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 Tt s-line quattro
83%
MOT pass rate · 1 vehicles
Verdict: On MOT pass rate the Audi A4 (76%) and Audi Tt s-line quattro (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 Tt s-line quattro
MOT pass rate 76% 83% ✓
MOT failure rate 24% 17% ✓
Faults & advisories per test 1.9 1.9
Dangerous-fault share 2% 0% ✓
Average mileage 133,841 mi 102,912 mi
Sample size (vehicles) 568,515 1

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 Tt s-line quattro

  1. Front Inner Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii))
  2. Rear Inner Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii))
  3. Engine covers And Undertrays fitted obscuring some components
  4. 245/35R19 CONTINENTAL CONTI SPORT CONTACT 3* EXTRA LOAD ALROUND
  5. Nearside Front Tyre worn close to the legal limit 2.49 mm (4.1.E.1)
  6. Nearside Headlamp aim too high (1.8)

Reliability FAQ

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

Full Audi A4 report Full Audi Tt s-line 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.