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Audi A1 vs Audi A4 s ln blk ed 35 tfsi mhev sa: reliability comparison

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

Audi A1
84%
MOT pass rate · 235,482 vehicles
Audi A4 s ln blk ed 35 tfsi mhev sa
89%
MOT pass rate · 6,055 vehicles
More reliable
Verdict: On MOT pass rate, the Audi A4 s ln blk ed 35 tfsi mhev sa is the more reliable of the two — 89% pass first time versus 84%. It's one signal among several; check the full breakdown below.

Head to head

Measure Audi A1 Audi A4 s ln blk ed 35 tfsi mhev sa
MOT pass rate 84% 89% ✓
MOT failure rate 16% 11% ✓
Faults & advisories per test 1.5 0.9 ✓
Dangerous-fault share 5% ✓ 10%
Average mileage 67,791 mi 38,039 mi
Sample size (vehicles) 235,482 6,055

Most common faults

Audi A1

  1. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  2. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Rear Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii))
  4. Offside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
  5. Nearside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
  6. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))

Audi A4 s ln blk ed 35 tfsi mhev sa

  1. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  2. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  4. Front Brake pad(s) wearing thin (1.1.13 (a) (ii))
  5. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  6. Nearside Rear Child Seat fitted not allowing full inspection of adult belt

Reliability FAQ

On MOT pass rate, the Audi A4 s ln blk ed 35 tfsi mhev sa is the more reliable of the two — 89% pass first time versus 84%. It's one signal among several; check the full breakdown below.

Full Audi A1 report Full Audi A4 s ln blk ed 35 tfsi mhev sa 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.