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Audi A4 vs Audi S5 tdi mhev quattro 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 S5 tdi mhev quattro auto
90%
MOT pass rate · 317 vehicles
More reliable
Verdict: On MOT pass rate, the Audi S5 tdi mhev quattro auto is the more reliable of the two — 90% pass first time versus 76%. It's one signal among several; check the full breakdown below.

Head to head

Measure Audi A4 Audi S5 tdi mhev quattro auto
MOT pass rate 76% 90% ✓
MOT failure rate 24% 10% ✓
Faults & advisories per test 1.9 0.9 ✓
Dangerous-fault share 2% ✓ 7%
Average mileage 133,841 mi 41,823 mi
Sample size (vehicles) 568,515 317

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 S5 tdi mhev quattro auto

  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. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  4. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  5. Offside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
  6. Front Brake pad(s) wearing thin (1.1.13 (a) (ii))

Reliability FAQ

On MOT pass rate, the Audi S5 tdi mhev quattro auto is the more reliable of the two — 90% pass first time versus 76%. It's one signal among several; check the full breakdown below.

Full Audi A4 report Full Audi S5 tdi mhev 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.