Mazda 6 vs Mazda B series: reliability comparison
MOT pass rates, common faults and mileage compared from real UK MOT data.
Mazda 6
75%
MOT pass rate · 159,403 vehicles
More reliable
Mazda B series
69%
MOT pass rate · 9,865 vehicles
Verdict: On MOT pass rate, the Mazda 6 is the more reliable of the two — 75% pass first time versus 69%. It's one signal among several; check the full breakdown below.
Head to head
| Measure | Mazda 6 | Mazda B series |
|---|---|---|
| MOT pass rate | 75% ✓ | 69% |
| MOT failure rate | 25% ✓ | 31% |
| Faults & advisories per test | 1.9 ✓ | 2.6 |
| Dangerous-fault share | 2% | 1% ✓ |
| Average mileage | 113,866 mi | 134,247 mi |
| Sample size (vehicles) | 159,403 | 9,865 |
Most common faults
Mazda 6
- Nearside Front Tyre worn close to the legal limit (4.1.E.1)
- Offside Front Tyre worn close to the legal limit (4.1.E.1)
- Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
- Rear Brake pad(s) wearing thin (3.5.1g)
- Offside Rear Tyre worn close to the legal limit (4.1.E.1)
- Under-trays fitted obscuring some underside components
Mazda B series
- Offside Front Brake pipe slightly corroded (3.6.B.2c)
- Offside Rear Tyre worn close to the legal limit (4.1.E.1)
- Nearside Rear Tyre worn close to the legal limit (4.1.E.1)
- Nearside Front Brake pipe slightly corroded (3.6.B.2c)
- Offside Front Tyre worn close to the legal limit (4.1.E.1)
- Nearside Front Tyre worn close to the legal limit (4.1.E.1)
Reliability FAQ
On MOT pass rate, the Mazda 6 is the more reliable of the two — 75% pass first time versus 69%. It's one signal among several; check the full breakdown below.
Full Mazda 6 report Full Mazda B series 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.