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Porsche 911 vs Porsche 911 turbo coupe: reliability comparison

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

Porsche 911
85%
MOT pass rate · 74,656 vehicles
Porsche 911 turbo coupe
76%
MOT pass rate · 90 vehicles
Verdict: On MOT pass rate the Porsche 911 (85%) and Porsche 911 turbo coupe (76%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Porsche 911 Porsche 911 turbo coupe
MOT pass rate 85% ✓ 76%
MOT failure rate 15% ✓ 24%
Faults & advisories per test 1.1 1.0 ✓
Dangerous-fault share 1% 0% ✓
Average mileage 70,982 mi 67,043 mi
Sample size (vehicles) 74,656 90

Most common faults

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))

Porsche 911 turbo coupe

  1. Oil leak
  2. Offside rear parking brake recording little or no effort (3.7.B.6a)
  3. Offside Seat belt anchorage prescribed area is excessively corroded (5.2.6)
  4. Brakes imbalanced across an axle (3.7.B.5b)
  5. Windscreen washer provides insufficient washer liquid (8.2.3)
  6. Exhaust emissions Lambda reading after 2nd fast idle outside specified limits (7.3.D.3)

Reliability FAQ

On MOT pass rate the Porsche 911 (85%) and Porsche 911 turbo coupe (76%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Porsche 911 report Full Porsche 911 turbo coupe 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.