How reliable is the Mazda BT-50 compared with other cars?

We do not publish a comparison for the Mazda BT-50, because the cars of this model that have been tested do not cover a wide enough range of ages and mileages. Its raw pass rate is 59.4% across 748 tests, but comparing a raw rate between models mostly ranks them by how new they are rather than how good they are. The failure and advisory patterns further down the page are still drawn from real tests and are worth reading.

What is the most common MOT failure on a Mazda BT-50?

The item recorded most often is "Brake pipe damaged or excessively corroded", which appears in 32.8% of failed Mazda BT-50 tests. Because one failed test can list several items, these shares do not add up to 100%.

What do testers most often warn about on a Mazda BT-50?

The most common advisory is "Brake pipe damaged or excessively corroded", noted on 39.3% of all Mazda BT-50 tests. An advisory is not a failure: it flags something that will likely need attention before the next test.

What mileage does a Mazda BT-50 usually have at its MOT?

The average odometer reading recorded at test is 117,786 miles. This is the mileage across all tested examples of every age, not an annual figure, so treat it as a description of the fleet rather than a target for one car.

Model reliability file

Mazda BT-50 MOT pass rate & common failures

From 748 recorded MOT tests of the Mazda BT-50, published by DVSA.

Data updated 29 July 2026

Quick answer

Across 748 MOT tests, 59.4% of Mazda BT-50 tests ended in a pass. This figure is not adjusted for age or mileage, so it is not a reliability ranking: the Mazda BT-50 fleet does not yet cover a wide enough spread of ages and distances to compare it fairly against other models. Its most commonly recorded failure is brake pipe damaged or excessively corroded, which appears in 32.8% of failed tests. Cars of this model average 117,786 miles on the odometer when tested.

At a glance

Recorded pass rate

59.4%unadjusted, not comparable748 tests

We are not publishing a ranking for the BT-50. The examples tested do not cover a wide enough spread of ages and mileages to compare it fairly, and an unadjusted pass rate mostly sorts models by how recently they were bought rather than how well they were built. The failure and advisory patterns below come from the same 748 tests and are worth reading on their own terms.

DVSA recorded wording

Most common failure items

Share of failed Mazda BT-50 tests in which each item was recorded. One failed test often lists several items, so these do not sum to 100%.

1.Brake pipe damaged or excessively corroded32.8%
77 occurrencesBrake pipe corroded explained
2.A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning17.0%
40 occurrencesLamp not working explained
3.Body, cab or chassis excessively corroded at a mounting point15.7%
37 occurrencesCorrosion in a structural area explained
4.The strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired12.8%
30 occurrencesSuspension mounting corroded or insecure explained
5.The aim of a headlamp is not within limits laid down in the requirements12.8%
30 occurrencesHeadlamp aim incorrect explained
6.An obligatory rear fog lamp missing, or a front or rear fog lamp inoperative or in the case of a multiple light source more than 1/2 not functioning11.9%
28 occurrencesLamp not working explained
7.Vehicle structure corroded to the extent that the rigidity of the assembly is seriously reduced11.1%
26 occurrencesCorrosion in a structural area explained
8.A transmission shaft constant velocity joint boot missing or no longer prevents the ingress of dirt etc7.7%
18 occurrencesDriveshaft CV joint gaiter split or missing explained
9.Wiper blade missing or obviously not clearing the windscreen7.2%
17 occurrencesWiper or washer not working properly explained
10.Stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning7.2%
17 occurrencesStop lamp not working explained

Warnings without a failure

Most common advisories

Share of all Mazda BT-50 tests carrying each advisory. The denominator differs from the failure list above because an advisory can be issued on a car that passed.

1.Brake pipe damaged or excessively corroded39.3%
294 testsBrake pipe corroded explained
2.Tyre tread depth not in accordance with the requirements19.4%
145 testsTyre worn close to the legal limit explained
3.A wheel bearing with excessive play17.0%
127 testsWheel bearing has excessive play or is rough explained
4.Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users15.5%
116 tests
5.A tyre seriously damaged11.8%
88 testsTyre damaged or deteriorated explained
6.Vehicle structure corroded to the extent that the rigidity of the assembly is seriously reduced10.8%
81 testsCorrosion in a structural area explained
7.Body, cab or chassis excessively corroded at a mounting point7.2%
54 testsCorrosion in a structural area explained
8.Vehicle structure corroded to the extent that the rigidity of the assembly is seriously reduced6.7%
50 testsCorrosion in a structural area explained

What gets tested

The BT-50 fleet

Average mileage recorded at test: 117,786
Fuel mix of tested cars: Diesel99.7%

Check a specific Mazda BT-50

A model average tells you the pattern. Its own MOT record tells you the car.

Compare within the range

Other Mazda models

Mazda 2 — 69.8% adjusted
Mazda 3 — 70.6% adjusted
Mazda MX-5 — 77.2% adjusted
Mazda CX-5 — 78.5% adjusted
Mazda 6 — 73.3% adjusted
Mazda CX-3 — 83.5% unadjusted
All Mazda models

Common questions

How reliable is the Mazda BT-50 compared with other cars?: We do not publish a comparison for the Mazda BT-50, because the cars of this model that have been tested do not cover a wide enough range of ages and mileages. Its raw pass rate is 59.4% across 748 tests, but comparing a raw rate between models mostly ranks them by how new they are rather than how good they are. The failure and advisory patterns further down the page are still drawn from real tests and are worth reading.
What is the most common MOT failure on a Mazda BT-50?: The item recorded most often is "Brake pipe damaged or excessively corroded", which appears in 32.8% of failed Mazda BT-50 tests. Because one failed test can list several items, these shares do not add up to 100%.
What do testers most often warn about on a Mazda BT-50?: The most common advisory is "Brake pipe damaged or excessively corroded", noted on 39.3% of all Mazda BT-50 tests. An advisory is not a failure: it flags something that will likely need attention before the next test.
What mileage does a Mazda BT-50 usually have at its MOT?: The average odometer reading recorded at test is 117,786 miles. This is the mileage across all tested examples of every age, not an annual figure, so treat it as a description of the fleet rather than a target for one car.

How this was worked out

Method and limits

Figures come from the DVSA anonymised MOT testing dataset, published under the Open Government Licence. Only class 4 initial tests are counted: retests are excluded so a car appears once, and abandoned tests are excluded entirely. No adjusted rate is shown because this model's tested examples do not cover enough of the national age and mileage range for standardisation to mean anything.

An MOT measures whether a car met a legal standard on the day. It is not a breakdown record, a service history or a running-cost estimate, and a pass rate is a property of a fleet rather than a prediction about one car.