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Audi A4 s line 30 tdi s-a vs Audi A6: reliability comparison

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

Audi A4 s line 30 tdi s-a
87%
MOT pass rate · 183 vehicles
More reliable
Audi A6
78%
MOT pass rate · 246,602 vehicles
Verdict: On MOT pass rate, the Audi A4 s line 30 tdi s-a is the more reliable of the two — 87% pass first time versus 78%. It's one signal among several; check the full breakdown below.

Head to head

Measure Audi A4 s line 30 tdi s-a Audi A6
MOT pass rate 87% ✓ 78%
MOT failure rate 13% ✓ 22%
Faults & advisories per test 1.1 ✓ 1.7
Dangerous-fault share 8% 2% ✓
Average mileage 68,117 mi 136,441 mi
Sample size (vehicles) 183 246,602

Most common faults

Audi A4 s line 30 tdi s-a

  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. Rear Brake pad(s) wearing thin (1.1.13 (a) (ii))
  6. Front Brake pad(s) wearing thin (1.1.13 (a) (ii))

Audi A6

  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 Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  4. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  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)

Reliability FAQ

On MOT pass rate, the Audi A4 s line 30 tdi s-a is the more reliable of the two — 87% pass first time versus 78%. It's one signal among several; check the full breakdown below.

Full Audi A4 s line 30 tdi s-a report Full Audi A6 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.