2025 MOT results
Infiniti Q30 common problems
The most common reason a Infiniti Q30 fails its MOT is a broken coil spring, on 15.1% of its 1,026 failed tests in 2025. Against other cars of the same age, 4 faults stand out, the widest gaps being: a split joint boot at 11.6% of failures against 1.3% expected; a broken coil spring at 15.1% of failures against 8.9% expected; a sidelight out at 5.0% of failures against 3.0% expected.
- Tests in 2025 4,850 Cars aged three and over
- Failed first time 21.2% 1,026 tests
- Found a dangerous defect 5.6% Unsafe to drive away
- Ended with an advisory 45.7% A problem to watch, not a failure
What fails a Infiniti Q30 MOT
Each bar is the share of failed Infiniti Q30 tests with that defect. Where we can compare it with cars of the same registration years, the marker shows what an average car of those ages records (12 of the 12 items below).
Most common reasons for failure
A test can fail for more than one defect, so shares add up to more than 100%.
| Defect | Share of failed tests |
|---|---|
| Coil spring: fractured or broken Suspension | 15.1% |
| Linkage ball joint dust cover no longer prevents the ingress of dirt Suspension | 11.6% |
| Tyres: tread depth below requirements of 1.6mm Tyres | 10.4% |
| Brake pads: less than 1.5 mm thick Brakes | 9.0% |
| Malfunction indicator lamp: inoperative or indicates a malfunction Noise, emissions and leaks | 8.1% |
| Headlamp aim: too low Lamps, reflectors and electrical equipment | 6.2% |
| Washers: provides insufficient washer liquid Visibility | 6.2% |
| Headlamp: not working on dipped beam Lamps, reflectors and electrical equipment | 5.3% |
| Anti-roll bars: ball joint dust cover no longer prevents the ingress of dirt Suspension | 5.2% |
| Position lamp: not working Lamps, reflectors and electrical equipment | 5.0% |
| Tyres: cut in excess of the requirements deep enough to reach the ply or cords Tyres | 4.5% |
| Tyre pressure monitoring system: malfunctioning or obviously inoperative Tyres | 3.7% |
Source:DVSA,UK Motoring analysis 2025 Updated
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Broken coil spring
15.1% of failures 8.9% expected 1.7 times as often
A broken suspension spring, which usually snaps in the bottom coil and often fails on both sides within a year.
Look at each corner for a sagging ride height, and listen for a knock over speed bumps.
-
Split joint boot
11.6% of failures 1.3% expected 8.9 times as often
A split rubber boot on a joint or driveshaft. The joint may still be sound, but dirt and water get in once the boot is open.
Turn the wheels to full lock and look behind them for greasy splits in the rubber concertina.
-
Tyre worn below the legal limit
10.4% of failures 9.6% expected about as expected
A tyre worn past the 1.6mm legal minimum across the middle three quarters of the tread.
A 20p coin in the main grooves: if the outer band of the coin is visible, the tyre is close to the limit.
-
Worn brake pads
9.0% of failures 8.7% expected about as expected
Friction material worn under 1.5mm, thinner than the point most manufacturers call the limit.
Look through the wheel spokes at the pad against the disc; wear indicators squeal before they get this far.
-
Engine management light on
8.1% of failures 5.6% expected somewhat more often
The engine management light is on, or has been disconnected. Either fails the test.
A cheap code reader on the diagnostic socket will say what the car has stored before you pay for a test.
-
Headlamp aim set too low
6.2% of failures 4.0% expected 1.6 times as often
The dipped beam points lower than it should, so it lights too little of the road.
Nothing to do at the roadside, but a garage resets the aim in minutes; a sagging suspension corner or a heavy boot load can throw it out.
Which parts of the car fail
Suspension is the area that most often fails a Infiniti Q30, on 35.8% of failed tests. That is also where it differs most from cars of the same registration years, which record 26.2%.
Failure categories
DVSA's own sections of the test. The marker is what cars of the same registration years record.
| Defect category | Share of failed tests |
|---|---|
| Suspension | 35.8% |
| Tyres | 25.5% |
| Lamps, reflectors and electrical equipment | 24.0% |
| Brakes | 17.3% |
| Visibility | 13.6% |
| Noise, emissions and leaks | 8.7% |
| Seat belts and supplementary restraint systems | 3.8% |
| Body, chassis, structure | 2.8% |
Source:DVSA,UK Motoring analysis 2025 Updated
What testers warn about
45.7% of Infiniti Q30 tests ended with at least one advisory: a fault the tester found that did not fail the test. On Infiniti Q30s, these are the items to ask about on a car you are viewing, because they are what the last tester expected to go next.
Most common advisories
Share of all tests, passes included.
| Advisory | Share of tests |
|---|---|
| Tread depth: worn close to legal limit or worn on edge Tyres | 16.7% |
| Tyres: slightly damaged or cracking or perishing Tyres | 13.7% |
| Brake discs: worn, pitted or scored, but not seriously weakened Brakes | 11.6% |
| Brake pads: wearing thin Brakes | 9.2% |
| Brake discs: worn, but not excessively Brakes | 4.6% |
| Nail in tyre Non-component advisories | 2.6% |
| Child seat fitted not allowing full inspection of adult belt Non-component advisories | 2.4% |
| Suspension arms: ball joint has slight play Suspension | 1.9% |
| Registration plates: deteriorated but not likely to be misread Identification of the vehicle | 1.5% |
| Tyres: cut but not deep enough to reach the ply or cords Tyres | 1.2% |
| Coil spring: corroded Suspension | 1.1% |
| Rigid brake pipes: corroded, covered in grease or other material Brakes | 1.0% |
Source:DVSA,UK Motoring analysis 2025 Updated
Infiniti Q30 problems: common questions
What is the most common problem with a Infiniti Q30?
Of the faults that fail an MOT, “Coil spring: fractured or broken” is the most common: it appears on 15.1% of failed Infiniti Q30 tests. Across categories, suspension is the area that most often fails one, on 35.8% of failed tests.
How often does a Infiniti Q30 fail its MOT?
21.2% of Infiniti Q30 tests in 2025 were not passed first time, from 4,850 tests of cars aged three and over. Allowing for the age and mileage of the cars tested, that gives it a UK Motoring Reliability Score of 58 out of 100, where 50 is as expected.
Does anything fail more often on a Infiniti Q30 than on other cars?
Yes. “Linkage ball joint dust cover no longer prevents the ingress of dirt” appears on 11.6% of its failures against 1.3% for cars of the same age, and “Coil spring: fractured or broken” appears on 15.1% of its failures against 8.9% for cars of the same age. Where an item is missing from the national figures for a year, we use the smallest share those figures show, so the comparison never overstates the difference.
Are these the same as breakdowns or known faults?
No. These are the items a tester recorded at the MOT, which covers condition and safety: lamps, brakes, tyres, suspension, corrosion and emissions. A gearbox that is unpleasant, an infotainment screen that has died, or a car that will not start on a cold morning are not part of the test, so they are not in these figures.
Where do the figures come from?
Every normal MOT test of a Infiniti Q30 aged three and over in Great Britain in 2025, from DVSA's anonymised MOT results. Retests are excluded, and the same fault on more than one wheel counts once.
Data stories to read next
Data sources and methodology
| Figures | Source | Period | Records | Updated |
|---|---|---|---|---|
| MOT defects and advisories | Anonymised MOT tests and results Driver and Vehicle Standards Agency Derived statistics UK Motoring | 2025 | 4,850 MOT tests | 19 September 2026 |
- Shares for defects are of failed tests; shares for advisories are of all tests. A test can carry several defects, so shares add to more than 100%.
- The expected share is what an average car of the same registration years records, weighted by where this model’s failures fall. Where an item is outside the national figures for a year, the smallest share those figures show is used in its place, which is an upper bound, so the comparison never overstates a model’s problems. No expectation is published where less than 80% of the model’s failures can be compared.
- Great Britain only: DVSA does not run MOT testing in Northern Ireland. Cars under three years old are not tested.
- The descriptions of what each part does are general and the same on every model. Every figure comes from the MOT data.
Contains public sector information licensed under the Open Government Licence v3.0.