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Audi A1 vs Audi S5 tfsi quattro auto: 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 S5 tfsi quattro auto
91%
MOT pass rate · 314 vehicles
More reliable
Verdict: On MOT pass rate, the Audi S5 tfsi quattro auto is the more reliable of the two — 91% pass first time versus 84%. It's one signal among several; check the full breakdown below.

Head to head

Measure Audi A1 Audi S5 tfsi quattro auto
MOT pass rate 84% 91% ✓
MOT failure rate 16% 9% ✓
Faults & advisories per test 1.5 0.0 ✓
Dangerous-fault share 5% ✓ 9%
Average mileage 67,791 mi 65,240 mi
Sample size (vehicles) 235,482 314

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 S5 tfsi quattro auto

  1. Nearside Rear Child Seat fitted not allowing full inspection of adult belt
  2. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Rear Brake disc worn, but not excessively (1.1.14 (a) (i))
  4. Offside Front Shock absorbers has a serious fluid leak (5.3.2 (b))
  5. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  6. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))

Reliability FAQ

On MOT pass rate, the Audi S5 tfsi quattro auto is the more reliable of the two — 91% pass first time versus 84%. It's one signal among several; check the full breakdown below.

Full Audi A1 report Full Audi S5 tfsi quattro 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.