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Porsche 911 vs Porsche Chesil speedster: 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 Chesil speedster
64%
MOT pass rate · 2 vehicles
Verdict: On MOT pass rate the Porsche 911 (85%) and Porsche Chesil speedster (64%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Porsche 911 Porsche Chesil speedster
MOT pass rate 85% ✓ 64%
MOT failure rate 15% ✓ 36%
Faults & advisories per test 1.1 ✓ 2.1
Dangerous-fault share 1% 0% ✓
Average mileage 70,982 mi 7,408 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 Chesil speedster

  1. Horn not working (1.6.2a)
  2. Nearside Headlamp aim too high (1.8)
  3. Offside Headlamp aim too high (1.8)
  4. Windscreen washer provides insufficient washer liquid (8.2.3)
  5. Hydraulic brake cylinder corroded but not excessively weakened (3.6.A.2b)
  6. Offside Front Tyre worn close to the legal limit (4.1.E.1)

Reliability FAQ

On MOT pass rate the Porsche 911 (85%) and Porsche Chesil speedster (64%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Porsche 911 report Full Porsche Chesil speedster 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.