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Audi A4 vs Audi S4 t 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 S4 t quattro auto
82%
MOT pass rate · 206 vehicles
Verdict: On MOT pass rate the Audi A4 (76%) and Audi S4 t quattro auto (82%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Audi A4 Audi S4 t quattro auto
MOT pass rate 76% 82% ✓
MOT failure rate 24% 18% ✓
Faults & advisories per test 1.9 0.2 ✓
Dangerous-fault share 2% 0% ✓
Average mileage 133,841 mi 105,530 mi
Sample size (vehicles) 568,515 206

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 S4 t quattro auto

  1. Nearside Front fog light not working
  2. Nearside Rear Inner Position lamp with a multiple light source up to 1/2 not functioning (4.2.1 (a) (i))
  3. Offside Rear Inner Position lamp with a multiple light source up to 1/2 not functioning (4.2.1 (a) (i))
  4. Nearside Front Tyre worn close to legal limit/worn on edge 3mm (5.2.3 (e))
  5. Nearside Front Outer Drive shaft joint constant velocity boot split or insecure, no longer prevents the ingress of dirt (6.1.7 (g) (ii))
  6. Nearside Front Lower Suspension arm pin or bush worn but not resulting in excessive movement front arm bush (5.3.4 (a) (i))

Reliability FAQ

On MOT pass rate the Audi A4 (76%) and Audi S4 t quattro auto (82%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Audi A4 report Full Audi S4 t 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.