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Audi A1 tfsi vs Audi A4: reliability comparison

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

Audi A1 tfsi
79%
MOT pass rate · 27 vehicles
More reliable
Audi A4
76%
MOT pass rate · 568,515 vehicles
Verdict: On MOT pass rate, the Audi A1 tfsi is the more reliable of the two — 79% pass first time versus 76%. It's one signal among several; check the full breakdown below.

Head to head

Measure Audi A1 tfsi Audi A4
MOT pass rate 79% ✓ 76%
MOT failure rate 21% ✓ 24%
Faults & advisories per test 1.8 ✓ 1.9
Dangerous-fault share 6% 2% ✓
Average mileage 74,515 mi 133,841 mi
Sample size (vehicles) 27 568,515

Most common faults

Audi A1 tfsi

  1. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  2. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  4. Rear Brake pad(s) wearing thin (1.1.13 (a) (ii))
  5. Nearside Front Shock absorbers has light misting of oil (5.3.2 (b))
  6. Front Brake pad(s) wearing thin (1.1.13 (a) (ii))

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))

Reliability FAQ

On MOT pass rate, the Audi A1 tfsi is the more reliable of the two — 79% pass first time versus 76%. It's one signal among several; check the full breakdown below.

Full Audi A1 tfsi report Full Audi A4 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.