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Porsche 928 auto vs Porsche Boxster: reliability comparison

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

Porsche 928 auto
57%
MOT pass rate · 116 vehicles
Porsche Boxster
83%
MOT pass rate · 46,488 vehicles
Verdict: On MOT pass rate the Porsche 928 auto (57%) and Porsche Boxster (83%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Porsche 928 auto Porsche Boxster
MOT pass rate 57% 83% ✓
MOT failure rate 43% 17% ✓
Faults & advisories per test 4.0 1.4 ✓
Dangerous-fault share 0% ✓ 1%
Average mileage 85,136 mi 74,547 mi
Sample size (vehicles) 116 46,488

Most common faults

Porsche 928 auto

  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. Nearside Front wheel bearing has slight play (2.5.A.3c)
  4. Offside Front wheel bearing has slight play (2.5.A.3c)
  5. Offside rear outer driveshaft gaitor split slightly
  6. offside rear driveshaft boot split

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))

Reliability FAQ

On MOT pass rate the Porsche 928 auto (57%) and Porsche Boxster (83%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Porsche 928 auto report Full Porsche Boxster 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.