Mazda B MOT pass rate and common failures
In 2025, 59.4% of Mazda B MOT tests were a first-time pass, across 1,438 tests in Great Britain. For all cars it was 71.5%.
Compared with cars of the same age
Older cars fail more often, so a model that’s mostly a few years old will look better than one that’s mostly 12. These figures compare like with like.
At 3–5 years
–
Too few tests at this age to say.
At 6–10 years
–
Too few tests at this age to say.
At 11 years and over
59.5%
All cars: 61.3% (1.8 points worse). 1,390 tests.
Pass rate by age
Figures by age, with typical mileage
| Age (years) | Tests | First-time pass | All cars | Typical mileage |
|---|---|---|---|---|
| 19 | 245 | 58.4% | 57.2% | 108,750 miles |
| 20+ | 1,145 | 59.7% | 61.4% | 118,750 miles |
Typical mileage is the median reading at the test, to the nearest 2,500 miles.
What fails most often
The share of Mazda B MOT tests that failed on at least one item in each area, against all cars. A test can fail on several areas at once.
| Area | B | All cars |
|---|---|---|
| Lamps, reflectors and electrical equipment | 39.2% | 16.6% |
| Body, chassis, structure | 31.4% | 4.2% |
| Suspension | 21.2% | 13.7% |
| Brakes | 21.1% | 10.2% |
| Visibility | 9.3% | 5.2% |
| Tyres | 6.3% | 8.4% |
| Steering | 5.1% | 2.5% |
| Noise, emissions and leaks | 4.7% | 4.0% |
Most common reasons for failing
- Chassis condition: or chassis has excessive corrosion, seriously affecting its strength within 30cm of a body mounting failed 8.1% of tests · what this means
- Rear fog lamp: not working failed 7.8% of tests · what this means
- Joints: constant velocity boot split or insecure, no longer prevents the ingress of dirt failed 6.6% of tests
- Wipers: does not clear the windscreen effectively failed 5.8% of tests · what this means
- Rigid brake pipes: excessively corroded failed 5.6% of tests · what this means
- Position lamp: not working failed 5.6% of tests · what this means
- Component mounting prescribed areas: prescribed area excessively corroded significantly reducing structural strength failed 4.9% of tests
- Tread depth below requirements of 1.6mm failed 3.7% of tests
- Chassis condition: corroded to the extent that the rigidity of the assembly is significantly reduced failed 3.4% of tests · what this means
- Stop lamp: not working failed 3.0% of tests · what this means
Checking a particular B?
See its own MOT history, mileage record and advisories in plain English. Free, no sign-up.
About these figures
- They cover every B version DVSA records under this name (engines, trims and generations together), on its first MOT test of each visit. A “pass with rectification” (fixed within an hour) counts as a fail, as in DVSA’s own statistics.
- Cars under three years old are left out, because the few tested that young are mostly taxis.
- Fuel mix of the cars tested: diesel 96.5%, petrol 3.5%.
- A pass rate describes the model, not any one car. How a car has been looked after matters more.
Download these figures (CSV) · Other Mazda models · All makes
Source: DVSA anonymised MOT test data for 2025. Contains public sector information licensed under the Open Government Licence v3.0. Our own analysis; not produced or endorsed by DVSA.