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Porsche 911 targa 4s heritage vs Porsche Boxster: reliability comparison

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

Porsche 911 targa 4s heritage
97%
MOT pass rate · 86 vehicles
Porsche Boxster
83%
MOT pass rate · 46,488 vehicles
Verdict: On MOT pass rate the Porsche 911 targa 4s heritage (97%) 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 911 targa 4s heritage Porsche Boxster
MOT pass rate 97% ✓ 83%
MOT failure rate 3% ✓ 17%
Faults & advisories per test 0.1 ✓ 1.4
Dangerous-fault share 7% 1% ✓
Average mileage 6,544 mi 74,547 mi
Sample size (vehicles) 86 46,488

Most common faults

Porsche 911 targa 4s heritage

  1. Nearside Rear Nail in tyre
  2. Front Registration plate does not conform to the specified requirements (0.1 (d))
  3. Rear Registration plate does not conform to the specified requirements (0.1 (d))
  4. Nearside Headlamp aim too high (4.1.2 (a))
  5. Offside Headlamp aim too high (4.1.2 (a))
  6. undertrays, engine and component covers fitted

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 911 targa 4s heritage (97%) and Porsche Boxster (83%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Porsche 911 targa 4s heritage 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.