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Porsche 911 vs Porsche Carerra 4: 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 Carerra 4
88%
MOT pass rate · 2 vehicles
Verdict: On MOT pass rate the Porsche 911 (85%) and Porsche Carerra 4 (88%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Porsche 911 Porsche Carerra 4
MOT pass rate 85% 88% ✓
MOT failure rate 15% 12% ✓
Faults & advisories per test 1.1 ✓ 1.2
Dangerous-fault share 1% 0% ✓
Average mileage 70,982 mi 77,281 mi
Sample size (vehicles) 74,656 2

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 Carerra 4

  1. Offside Track rod end ball joint has slight play (2.2.B.1f)
  2. Front Brake pipe slightly corroded o/s and n/s metal (3.6.B.2c)
  3. engine covers; luggage area covers and undertrays fitted; obscuring certain testable components
  4. Nearside Front Brake pipe corroded, covered in grease or other material (1.1.11 (c))
  5. under trays fitted
  6. Nearside Front Tyre not fitted in accordance with side wall instructions (4.1.D.1f)

Reliability FAQ

On MOT pass rate the Porsche 911 (85%) and Porsche Carerra 4 (88%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Porsche 911 report Full Porsche Carerra 4 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.