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Ford Fiesta vs Ford Flex: reliability comparison

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

Ford Fiesta
73%
MOT pass rate · 2,835,744 vehicles
Ford Flex
77%
MOT pass rate · 49 vehicles
Verdict: On MOT pass rate the Ford Fiesta (73%) and Ford Flex (77%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Ford Fiesta Ford Flex
MOT pass rate 73% 77% ✓
MOT failure rate 27% 23% ✓
Faults & advisories per test 2.1 2.0 ✓
Dangerous-fault share 2% 2%
Average mileage 84,529 mi 69,459 mi
Sample size (vehicles) 2,835,744 49

Most common faults

Ford Fiesta

  1. Nearside Front Tyre worn close to the legal limit (4.1.E.1)
  2. Offside Front Tyre worn close to the legal limit (4.1.E.1)
  3. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  4. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  5. Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
  6. Offside Rear Brake pipe slightly corroded (3.6.B.2c)

Ford Flex

  1. Oil leak, but not excessive (8.4.1 (a) (i))
  2. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Nearside Rear Child Seat fitted not allowing full inspection of adult belt
  4. Front Brake disc worn, pitted or scored, but not seriously weakened (1.1.14 (a) (ii))
  5. Child seat fitted not allowing full inspection of adult belt
  6. Nearside Rear Anti-roll bar linkage ball joint has slight play (5.3.4 (a) (i))

Reliability FAQ

On MOT pass rate the Ford Fiesta (73%) and Ford Flex (77%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Ford Fiesta report Full Ford Flex 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.