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Porsche 911 vs Porsche 997 carrera 2s: 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 997 carrera 2s
71%
MOT pass rate · 1 vehicles
Verdict: On MOT pass rate the Porsche 911 (85%) and Porsche 997 carrera 2s (71%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Porsche 911 Porsche 997 carrera 2s
MOT pass rate 85% ✓ 71%
MOT failure rate 15% ✓ 29%
Faults & advisories per test 1.1 1.0 ✓
Dangerous-fault share 1% ✓ 6%
Average mileage 70,982 mi 34,640 mi
Sample size (vehicles) 74,656 1

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 997 carrera 2s

  1. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  2. Nearside Registration plate lamp not working (1.1.C.1d)
  3. Nearside Headlamp aim too high (1.8)
  4. Offside Headlamp aim too high (1.8)
  5. Offside Front coil spring incomplete (2.4.C.1a)
  6. Nearside Rear Brake pipe corroded, covered in grease or other material (1.1.11 (c))

Reliability FAQ

On MOT pass rate the Porsche 911 (85%) and Porsche 997 carrera 2s (71%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Porsche 911 report Full Porsche 997 carrera 2s 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.