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Mazda 6 vs Mazda 626 glx diesel-comprex: reliability comparison

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

Mazda 6
75%
MOT pass rate · 159,403 vehicles
Mazda 626 glx diesel-comprex
60%
MOT pass rate · 343 vehicles
Verdict: On MOT pass rate the Mazda 6 (75%) and Mazda 626 glx diesel-comprex (60%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Head to head

Measure Mazda 6 Mazda 626 glx diesel-comprex
MOT pass rate 75% ✓ 60%
MOT failure rate 25% ✓ 40%
Faults & advisories per test 1.9 ✓ 2.4
Dangerous-fault share 2% 0% ✓
Average mileage 113,866 mi 140,609 mi
Sample size (vehicles) 159,403 343

Most common faults

Mazda 6

  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. Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
  4. Rear Brake pad(s) wearing thin (3.5.1g)
  5. Offside Rear Tyre worn close to the legal limit (4.1.E.1)
  6. Under-trays fitted obscuring some underside components

Mazda 626 glx diesel-comprex

  1. Parking brake: efficiency below requirements (3.7.B.7)
  2. Offside Front Brake pipe excessively corroded (3.6.B.2c)
  3. Nearside Rear Tyre tread depth below requirements of 1.6mm (4.1.E.1)
  4. Exhaust emits an excessive level of metered smoke for a turbo charged engine (7.4.B.3b)
  5. Nearside Front Tyre worn close to the legal limit (4.1.E.1)
  6. Offside Front Tyre tread depth below requirements of 1.6mm (4.1.E.1)

Reliability FAQ

On MOT pass rate the Mazda 6 (75%) and Mazda 626 glx diesel-comprex (60%) are very close — weigh the individual measures below, and remember condition depends on age, mileage and upkeep.

Full Mazda 6 report Full Mazda 626 glx diesel-comprex 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.