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Porsche Boxster vs Porsche Carrera 4: reliability comparison

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

Porsche Boxster
83%
MOT pass rate · 46,488 vehicles
More reliable
Porsche Carrera 4
79%
MOT pass rate · 68 vehicles
Verdict: On MOT pass rate, the Porsche Boxster is the more reliable of the two — 83% pass first time versus 79%. It's one signal among several; check the full breakdown below.

Head to head

Measure Porsche Boxster Porsche Carrera 4
MOT pass rate 83% ✓ 79%
MOT failure rate 17% ✓ 21%
Faults & advisories per test 1.4 ✓ 1.5
Dangerous-fault share 1% 1%
Average mileage 74,547 mi 97,174 mi
Sample size (vehicles) 46,488 68

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 Carrera 4

  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. Offside Front Brake pipe corroded, covered in grease or other material (1.1.11 (c))
  4. Offside Front Brake pipe slightly corroded (3.6.B.2c)
  5. Nearside Front Brake pipe slightly corroded (3.6.B.2c)
  6. Offside Front Tyre worn close to the legal limit (4.1.E.1)

Reliability FAQ

On MOT pass rate, the Porsche Boxster is the more reliable of the two — 83% pass first time versus 79%. It's one signal among several; check the full breakdown below.

Full Porsche Boxster report Full Porsche Carrera 4 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.