MOT fail rates

Mazda CX-30 MOT fail rate by age

How often the Mazda CX-30 fails its MOT at each age, compared with all cars of the same age, and what it fails on. From 41,935 DVSA MOT tests taken 2022 to 2025.

MOT data updated 22 September 2026

At 3 years, the most tested age

MOT fail rate at age 3 (n=20,931)7.1%

All cars at 3 years (n=8,016,463)12.1%

Median mileage at test20,284

All cars, median mileage22,806

30 of 343 model groups with enough tests fail less often at 3 years.

What stands out

At 3 years the Mazda CX-30 fails 7.1% of MOTs (20,931 tests), 5.0 points below the 12.1% for all cars that age. At 5 years it fails 10.4% (6,459 tests), 4.9 points below the 15.3% average.
The gap is widest at 3 years: 5.0 points below all cars.
Its most common structural or mechanical fail item at 3 years: Shock absorber leaking, at 0.5 per 100 MOTs.

MOT fail rate by age

Solid line: this model. Dashed line: all cars at the same age.

Mazda CX-30: share of MOT tests that failed, by age, against all cars. Ages with fewer than 1,000 tests are not shown.
Age	MOT fail rate	Tests (n)	All cars	Difference	Median mileage
3 years	7.1%	20,931	12.1%	−5.0 pts	20,284 miles
4 years	8.6%	14,545	13.4%	−4.8 pts	26,437 miles
5 years	10.4%	6,459	15.3%	−4.9 pts	32,105 miles

Most common fail items at 3 years

Split into structural or mechanical items and wear items. Wear items (tyres, brake pads, wipers, bulbs) say more about upkeep than about the design.

Structural and mechanical

Fail item	Per 100 MOTs
Shock absorber leaking Major	0.5
Malfunction indicator lamp: inoperative or indicates a malfunction Major	0.3
Brake discs: significantly and obviously worn Major	0.2

Out of 20,931 MOTs. A test with two faults counts twice.

Wear and upkeep

Fail item	Per 100 MOTs
Tyre condition: has a cut in excess of the requirements deep enough to reach the ply or cords Major	1.6
Tyre tread below 1.6 mm Dangerous	1.4
Brake pads under 1.5 mm Dangerous	0.9
Wipers not clearing screen Major	0.8
Headlight aimed too high Major	0.7
Washers: provides insufficient washer liquid Major	0.7
Headlamp aim: too low Major	0.5

Out of 20,931 MOTs. A test with two faults counts twice.

Other models at 3 years

Model	MOT fail rate	Tests (n)	All cars
Mazda CX-5	10.1%	29,283	12.1%
Mazda 2	7.4%	21,809	12.1%
Mazda 3	9.1%	15,565	12.1%

MOT fail rate by first-use year

Each year has its own page: the fail rate for cars first used that year at each MOT from 2022 to 2025 with at least 1,000 tests, the most common faults at that age, and the car tax and ULEZ rules for that year.

First-use year data updated 28 September 2026.

Latest MOT age with at least 1,000 tests for each first-use year.
First used	Age at test	MOT fail rate	Tests (n)	All cars
2020	5 years in 2025	10.5%	6,224	15.3%
2021	4 years in 2025	8.2%	8,091	13.4%
2022	3 years in 2025	7.2%	6,164	12.1%

More on the Mazda CX-30

Read this with care. A fail rate is not a measure of build quality. How far cars are driven, how they are used and how well owners maintain them all change it, and wear items such as tyres and brake pads are common fails. Compare a model only with cars of the same age. Methodology and limits.

Looking at one Mazda CX-30?

These are figures for the model, not for one car. The VetTheCar Buying Report looks at a single car: its MOT tests, defects, advisories and mileage readings.

See an example report Browse the car tools

Source

Contains public sector information licensed under the Open Government Licence v3.0. Source: DVSA anonymised MOT test data, class 4 normal MOT tests, 2022 to 2025. MOT data updated 22 September 2026.

Not affiliated with or endorsed by DVSA. How we calculate these figures · Data sources