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Porsche 911t vs Porsche Boxster: reliability comparison

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

Porsche 911t
78%
MOT pass rate · 68 vehicles
Porsche Boxster
83%
MOT pass rate · 46,488 vehicles
More reliable
Verdict: On MOT pass rate, the Porsche Boxster is the more reliable of the two — 83% pass first time versus 78%. It's one signal among several; check the full breakdown below.

Head to head

Measure Porsche 911t Porsche Boxster
MOT pass rate 78% 83% ✓
MOT failure rate 22% 17% ✓
Faults & advisories per test 1.3 ✓ 1.4
Dangerous-fault share 0% ✓ 1%
Average mileage 56,394 mi 74,547 mi
Sample size (vehicles) 68 46,488

Most common faults

Porsche 911t

  1. Oil leak
  2. Offside Front wheel bearing has slight play (2.5.A.3c)
  3. Offside Headlamp aim too high (1.8)
  4. Windscreen washer provides insufficient washer liquid (8.2.3)
  5. Parking brake: efficiency below requirements (3.7.B.7)
  6. Nearside Headlamp aim too high (1.8)

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 Boxster is the more reliable of the two — 83% pass first time versus 78%. It's one signal among several; check the full breakdown below.

Full Porsche 911t 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.