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Porsche 911 vs Porsche Cayenne s turbo 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 Cayenne s turbo auto
87%
MOT pass rate · 4 vehicles
Verdict: On MOT pass rate the Porsche 911 (85%) and Porsche Cayenne s turbo auto (87%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Porsche 911 Porsche Cayenne s turbo auto
MOT pass rate 85% 87% ✓
MOT failure rate 15% 13% ✓
Faults & advisories per test 1.1 0.7 ✓
Dangerous-fault share 1% 0% ✓
Average mileage 70,982 mi 74,938 mi
Sample size (vehicles) 74,656 4

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 Cayenne s turbo 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. Nail in nearside front tyre
  4. Nearside Rear Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
  5. Brake disc worn, pitted or scored, but not seriously weakened front discs corroded (1.1.14 (a) (ii))
  6. Sub-frame corroded but not seriously weakened both front and rear subframes corroded (5.3.3 (b) (i))

Reliability FAQ

On MOT pass rate the Porsche 911 (85%) and Porsche Cayenne s turbo auto (87%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Porsche 911 report Full Porsche Cayenne s turbo 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.