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Porsche Boxster vs Porsche Cayman gt4: reliability comparison

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

Porsche Boxster
83%
MOT pass rate · 46,488 vehicles
Porsche Cayman gt4
97%
MOT pass rate · 37 vehicles
Verdict: On MOT pass rate the Porsche Boxster (83%) and Porsche Cayman gt4 (97%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Porsche Boxster Porsche Cayman gt4
MOT pass rate 83% 97% ✓
MOT failure rate 17% 3% ✓
Faults & advisories per test 1.4 0.1 ✓
Dangerous-fault share 1% 0% ✓
Average mileage 74,547 mi 17,418 mi
Sample size (vehicles) 46,488 37

Most common faults

Porsche Boxster

  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. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))

Porsche Cayman gt4

  1. Nearside Front Service brake fluctuating, but not excessively (1.2.1 (e))
  2. Nearside Front Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
  3. Offside Front Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
  4. Front Registration plate does not conform to the specified requirements (0.1 (d))
  5. Nearside Rear Tyre worn close to legal limit/worn on edge 1.70mm Dangerous (5.2.3 (e))
  6. Offside Rear Tyre worn close to legal limit/worn on edge 2.30mm (5.2.3 (e))

Reliability FAQ

On MOT pass rate the Porsche Boxster (83%) and Porsche Cayman gt4 (97%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Porsche Boxster report Full Porsche Cayman gt4 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.