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Porsche 911 targa tiptronic s vs Porsche Boxster: reliability comparison

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

Porsche 911 targa tiptronic s
85%
MOT pass rate · 69 vehicles
More reliable
Porsche Boxster
83%
MOT pass rate · 46,488 vehicles
Verdict: On MOT pass rate, the Porsche 911 targa tiptronic s is the more reliable of the two — 85% pass first time versus 83%. It's one signal among several; check the full breakdown below.

Head to head

Measure Porsche 911 targa tiptronic s Porsche Boxster
MOT pass rate 85% ✓ 83%
MOT failure rate 15% ✓ 17%
Faults & advisories per test 0.9 ✓ 1.4
Dangerous-fault share 0% ✓ 1%
Average mileage 70,085 mi 74,547 mi
Sample size (vehicles) 69 46,488

Most common faults

Porsche 911 targa tiptronic s

  1. Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
  2. Oil leak, but not excessive (8.4.1 (a) (i))
  3. Oil leak
  4. Nearside Front Tyre worn close to the legal limit (4.1.E.1)
  5. Nearside Front Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))
  6. Offside Front Tyre slightly damaged/cracking or perishing (5.2.3 (d) (ii))

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 tiptronic s is the more reliable of the two — 85% pass first time versus 83%. It's one signal among several; check the full breakdown below.

Full Porsche 911 targa tiptronic s 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.