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Porsche 350 vs Porsche 911: reliability comparison

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

Porsche 350
67%
MOT pass rate · 1 vehicles
Porsche 911
85%
MOT pass rate · 74,656 vehicles
Verdict: On MOT pass rate the Porsche 350 (67%) and Porsche 911 (85%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Porsche 350 Porsche 911
MOT pass rate 67% 85% ✓
MOT failure rate 33% 15% ✓
Faults & advisories per test 1.8 1.1 ✓
Dangerous-fault share 0% ✓ 1%
Average mileage 68,042 mi 70,982 mi
Sample size (vehicles) 1 74,656

Most common faults

Porsche 350

  1. o/s and n/s rear chassis members heavilly corroded
  2. o/s/f inner wing corroded
  3. o/s/r trailing arm attachment bracket/mounting corroded but its strength is not seriously reduced
  4. Service brake: service brake efficiency only just met. It would appear that the braking system requires adjustment or repair. (3.7.B.7)
  5. Brakes imbalanced requirements only just met. It would appear that the braking system requires adjustment or repair. (3.7.B.5b)
  6. Nearside Windscreen washer provides insufficient washer liquid (8.2.3)

Porsche 911

  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. Oil leak, but not excessive (8.4.1 (a) (i))

Reliability FAQ

On MOT pass rate the Porsche 350 (67%) and Porsche 911 (85%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Porsche 350 report Full Porsche 911 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.