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Porsche 911 vs Porsche 944s: 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 944s
84%
MOT pass rate · 2 vehicles
Verdict: On MOT pass rate the Porsche 911 (85%) and Porsche 944s (84%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Porsche 911 Porsche 944s
MOT pass rate 85% ✓ 84%
MOT failure rate 15% ✓ 16%
Faults & advisories per test 1.1 ✓ 1.5
Dangerous-fault share 1% 0% ✓
Average mileage 70,982 mi 120,773 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 944s

  1. Nearside Front Anti-roll bar linkage rubber bush deteriorated but not resulting in excessive movement (2.4.G.2)
  2. Nearside Rear Brake pipe slightly corroded (3.6.B.2c)
  3. Nearside Track rod end ball joint dust cover deteriorated, but preventing the ingress of dirt (2.2.C.1c)
  4. Offside Anti-roll bar linkage rubber bush deteriorated but not resulting in excessive movement (2.4.G.2)
  5. Offside Rear Brake pipe slightly corroded (3.6.B.2c)
  6. Oil leak, but not excessive (8.4.1 (a) (i))

Reliability FAQ

On MOT pass rate the Porsche 911 (85%) and Porsche 944s (84%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Porsche 911 report Full Porsche 944s 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.