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Porsche Cayenne vs Porsche G550: reliability comparison

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

Porsche Cayenne
84%
MOT pass rate · 40,483 vehicles
Porsche G550
79%
MOT pass rate · 1 vehicles
Verdict: On MOT pass rate the Porsche Cayenne (84%) and Porsche G550 (79%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Porsche Cayenne Porsche G550
MOT pass rate 84% ✓ 79%
MOT failure rate 16% ✓ 21%
Faults & advisories per test 1.2 ✓ 1.4
Dangerous-fault share 3% 0% ✓
Average mileage 87,610 mi 5,125 mi
Sample size (vehicles) 40,483 1

Most common faults

Porsche Cayenne

  1. Front Brake pad(s) wearing thin (1.1.13 (a) (ii))
  2. Offside Rear 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 Front 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. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))

Porsche G550

  1. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  2. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Rear wheel bearing has slight play (2.6.2)
  4. number plates ?
  5. Nearside Rear position lamp(s) not working (1.1.A.3b)
  6. Offside Rear position lamp(s) not working (1.1.A.3b)

Reliability FAQ

On MOT pass rate the Porsche Cayenne (84%) and Porsche G550 (79%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Porsche Cayenne report Full Porsche G550 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.