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Porsche 911 vs Porsche 911 carrera 4 auto: reliability comparison

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

Porsche 911
85%
MOT pass rate · 74,656 vehicles
Porsche 911 carrera 4 auto
93%
MOT pass rate · 127 vehicles
More reliable
Verdict: On MOT pass rate, the Porsche 911 carrera 4 auto is the more reliable of the two — 93% pass first time versus 85%. It's one signal among several; check the full breakdown below.

Head to head

Measure Porsche 911 Porsche 911 carrera 4 auto
MOT pass rate 85% 93% ✓
MOT failure rate 15% 7% ✓
Faults & advisories per test 1.1 0.4 ✓
Dangerous-fault share 1% ✓ 11%
Average mileage 70,982 mi 21,836 mi
Sample size (vehicles) 74,656 127

Most common faults

Porsche 911

  1. Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
  2. Offside Rear Tyre worn close to the legal limit (4.1.E.1)
  3. Under-trays fitted obscuring some underside components
  4. Nearside Front Tyre worn close to the legal limit (4.1.E.1)
  5. Offside Front Tyre worn close to the legal limit (4.1.E.1)
  6. Oil leak, but not excessive (8.4.1 (a) (i))

Porsche 911 carrera 4 auto

  1. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  2. Nearside Front Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
  3. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  4. Offside Front Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
  5. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  6. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))

Reliability FAQ

On MOT pass rate, the Porsche 911 carrera 4 auto is the more reliable of the two — 93% pass first time versus 85%. It's one signal among several; check the full breakdown below.

Full Porsche 911 report Full Porsche 911 carrera 4 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.