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Porsche Boxster vs Porsche Cayman s s-a: 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 s s-a
94%
MOT pass rate · 321 vehicles
More reliable
Verdict: On MOT pass rate, the Porsche Cayman s s-a is the more reliable of the two — 94% pass first time versus 83%. It's one signal among several; check the full breakdown below.

Head to head

Measure Porsche Boxster Porsche Cayman s s-a
MOT pass rate 83% 94% ✓
MOT failure rate 17% 6% ✓
Faults & advisories per test 1.4 0.6 ✓
Dangerous-fault share 1% ✓ 3%
Average mileage 74,547 mi 53,195 mi
Sample size (vehicles) 46,488 321

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 s s-a

  1. Offside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  2. Nearside Rear Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Offside Front Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
  4. Nearside Front Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
  5. Front Brake pad(s) wearing thin (1.1.13 (a) (ii))
  6. Offside Front Brake pipe corroded, covered in grease or other material (1.1.11 (c))

Reliability FAQ

On MOT pass rate, the Porsche Cayman s s-a is the more reliable of the two — 94% pass first time versus 83%. It's one signal among several; check the full breakdown below.

Full Porsche Boxster report Full Porsche Cayman s s-a 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.