Skip to content

Audi A3 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 A3
78%
MOT pass rate · 586,036 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 78%. It's one signal among several; check the full breakdown below.

Head to head

Measure Audi A3 Audi A4 s ln blk ed 35 tfsi mhev sa
MOT pass rate 78% 89% ✓
MOT failure rate 22% 11% ✓
Faults & advisories per test 1.8 0.9 ✓
Dangerous-fault share 3% ✓ 10%
Average mileage 112,882 mi 38,039 mi
Sample size (vehicles) 586,036 6,055

Most common faults

Audi A3

  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 Front Tyre worn close to the legal limit (4.1.E.1)
  4. Offside Front Tyre worn close to the legal limit (4.1.E.1)
  5. Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
  6. Offside Rear Tyre worn close to the legal limit (4.1.E.1)

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 78%. It's one signal among several; check the full breakdown below.

Full Audi A3 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.