Skip to content

Mazda 3 vs Mazda Cosmo: reliability comparison

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

Mazda 3
78%
MOT pass rate · 164,058 vehicles
Mazda Cosmo
70%
MOT pass rate · 24 vehicles
Verdict: On MOT pass rate the Mazda 3 (78%) and Mazda Cosmo (70%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Mazda 3 Mazda Cosmo
MOT pass rate 78% ✓ 70%
MOT failure rate 22% ✓ 30%
Faults & advisories per test 2.0 1.6 ✓
Dangerous-fault share 3% 0% ✓
Average mileage 90,915 mi 70,312 mi
Sample size (vehicles) 164,058 24

Most common faults

Mazda 3

  1. Nearside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  2. Offside Front Tyre worn close to legal limit/worn on edge (5.2.3 (e))
  3. Nearside Front Tyre worn close to the legal limit (4.1.E.1)
  4. Rear Sub-frame corroded but not seriously weakened (5.3.3 (b) (i))
  5. Offside Front Tyre worn close to the legal limit (4.1.E.1)
  6. Front Brake pad(s) wearing thin (1.1.13 (a) (ii))

Mazda Cosmo

  1. Nearside Stop lamp not working (1.2.1b)
  2. Horn not working (1.6.2a)
  3. Offside Stop lamp not working (1.2.1b)
  4. Offside Windscreen wiper does not clear the windscreen effectively (8.2.2)
  5. Engine covers fitted obscuring some components in the engine bay
  6. Under-trays fitted obscuring some underside components

Reliability FAQ

On MOT pass rate the Mazda 3 (78%) and Mazda Cosmo (70%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Mazda 3 report Full Mazda Cosmo 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.