How reliable is the Infiniti Q30 compared with other cars?

We do not publish a comparison for the Infiniti Q30, because the cars of this model that have been tested do not cover a wide enough range of ages and mileages.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 78.8% across 4,850 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 Infiniti Q30?

The item recorded most often is "A spring or spring component fractured or seriously weakened", which appears in 20.3% of failed Infiniti Q30 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 Infiniti Q30?

The most common advisory is "Tyre tread depth not in accordance with the requirements", noted on 22.4% of all Infiniti Q30 tests. An advisory is not a failure: it flags something that will likely need attention before the next test.

What mileage does a Infiniti Q30 usually have at its MOT?

The average odometer reading recorded at test is 67,137 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.

Are most Infiniti Q30 models petrol or diesel?

Of the Infiniti Q30 cars tested, 80% are diesel, 20% are petrol. Fuel type affects which items tend to fail, particularly emissions and exhaust components.

Model reliability file

Infiniti Q30 MOT pass rate & common failures

From 4,850 recorded MOT tests of the Infiniti Q30, published by DVSA.

Data updated 29 July 2026

Quick answer

Across 4,850 MOT tests, 78.8% of Infiniti Q30 tests ended in a pass. This figure is not adjusted for age or mileage, so it is not a reliability ranking: the Infiniti Q30 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 spring or spring component fractured or seriously weakened, which appears in 20.3% of failed tests. Cars of this model average 67,137 miles on the odometer when tested.

At a glance

Recorded pass rate

78.8%unadjusted, not comparable4,850 tests

We are not publishing a ranking for the Q30. 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 4,850 tests and are worth reading on their own terms.

DVSA recorded wording

Most common failure items

Share of failed Infiniti Q30 tests in which each item was recorded. One failed test often lists several items, so these do not sum to 100%.

1.A spring or spring component fractured or seriously weakened20.3%
175 occurrencesRoad spring broken or fractured explained
2.A suspension joint dust cover missing or no longer prevents the ingress of dirt etc19.8%
171 occurrencesSuspension joint dust cover missing or split explained
3.Tyre tread depth not in accordance with the requirements16.9%
146 occurrencesTyre worn close to the legal limit explained
4.A brake lining or pad worn below 1.5mm11.9%
103 occurrencesBrake drum or shoe worn or contaminated explained
5.A suspension joint dust cover missing or no longer prevents the ingress of dirt etc8.7%
75 occurrencesSuspension joint dust cover missing or split explained
6.A tyre seriously damaged6.5%
56 occurrencesTyre damaged or deteriorated explained
7.A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning5.8%
50 occurrencesLamp not working explained
8.A tyre cords visible or damaged5.2%
45 occurrencesTyre ply or cord exposed, or the casing separating explained
9.A headlamp or light source missing, inoperative or more than ½ not functioning in the case of LED5.1%
44 occurrencesHeadlamp not working explained
10.Brake disc or drum significantly and obviously worn4.6%
40 occurrencesBrake disc worn, pitted or scored explained

Warnings without a failure

Most common advisories

Share of all Infiniti Q30 tests carrying each advisory. The denominator differs from the failure list above because an advisory can be issued on a car that passed.

1.Tyre tread depth not in accordance with the requirements22.4%
1,085 testsTyre worn close to the legal limit explained
2.A tyre seriously damaged21.5%
1,042 testsTyre damaged or deteriorated explained
3.Brake disc or drum excessively weakened, insecure or fractured17.3%
840 testsBrake disc worn, pitted or scored explained
4.A brake lining or pad worn below 1.5mm10.7%
517 testsBrake drum or shoe worn or contaminated explained
5.Brake disc or drum significantly and obviously worn6.4%
310 testsBrake disc worn, pitted or scored explained
6.Tyre tread depth not in accordance with the requirements3.0%
145 testsTyre worn close to the legal limit explained
7.Nail in tyre2.8%
136 tests
8.Child Seat fitted not allowing full inspection of adult belt2.7%
129 tests

What gets tested

The Q30 fleet

Average mileage recorded at test: 67,137
Fuel mix of tested cars: Diesel79.7%
Petrol20.3%

Check a specific Infiniti Q30

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

Compare within the range

Other Infiniti models

Infiniti Q50 — 76.0% unadjusted
All Infiniti models

Common questions

How reliable is the Infiniti Q30 compared with other cars?: We do not publish a comparison for the Infiniti Q30, 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 78.8% across 4,850 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 Infiniti Q30?: The item recorded most often is "A spring or spring component fractured or seriously weakened", which appears in 20.3% of failed Infiniti Q30 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 Infiniti Q30?: The most common advisory is "Tyre tread depth not in accordance with the requirements", noted on 22.4% of all Infiniti Q30 tests. An advisory is not a failure: it flags something that will likely need attention before the next test.
What mileage does a Infiniti Q30 usually have at its MOT?: The average odometer reading recorded at test is 67,137 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.
Are most Infiniti Q30 models petrol or diesel?: Of the Infiniti Q30 cars tested, 80% are diesel, 20% are petrol. Fuel type affects which items tend to fail, particularly emissions and exhaust components.

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.