Pass rate
90.7%
Above average — 2.8 pts ahead of the 87.9% that cars this age and mileage manage.
Across 989 recorded tests.
Typical repair bill £33–£78
2018 Infiniti Q30 MOT pass rate
- 2018
- typical 42,855 mi
Most common fault
Tyres
42.2% of faults · 19.8% nationally
mostly tread below the limit, cuts and sidewall bulges.
Part only £55–£85 for Tread depth below 1.6 mm. What fitting it takes →
Which year to buy
- Best 2019 91.4% pass
- Avoid 2016 86.1% pass
Across the 4 years on record, a spread of 5.3 points. See every year →
- First-attempt pass
- 89.8%
- Typical mileage
- 43k mi
The 2018 Infiniti Q30 MOT pass rate is 90.7% of its MOT tests — 2.8 points ahead of what its age and mileage predict. Tyres is the biggest single reason it fails, at 42.2% of what testers record.
Check your postcode
MOT pass rates are national — type your postcode to see how Infiniti Q30 does in your corner of the country.
Expert verdict
Tyres: 2.1× the national share
Tyres make up 42.2% of everything recorded on the 2018 Infiniti Q30, against 19.8% nationally — 22.4 points above. Check all four tyres yourself, including the inner shoulders, and look at the date stamp — a tyre can pass on tread and still be six years old.
- When it fails, it costs. Only 21% of this model’s typical repairs come in under £30 in parts — the failures here tend to be the kind that need a garage rather than a bulb.
Written from this page's own figures: fault shares against the national composition, the like-for-like pass rate, and the priced repair list. How these are worked out
Watching a Infiniti Q30? Get an email when these numbers change .
How does the 2018 Infiniti Q30 compare?
Cars of this age and mileage average 87.9%, so this figure is 2.8 points ahead of what its age and mileage predict. On a first attempt, before any retests, the figure drops to 89.8%. The median 2018 Infiniti Q30 in this dataset had covered 42,855 mi.
50% of the tests on this vehicle ran on Petrol, which passed 91.7% of the time. Pass rates also shift with the test month: tests recorded October–March passed 92.3% of the time, April–September 88.5%.
The single most recorded failure item is "Tread depth below requirements of 1.6mm", noted on 1.42% of tests.
- 989 recorded tests behind this page.
- 90.7% overall pass rate, 89.8% on a first attempt.
- Across every year of the Infiniti Q30, the average is 86.7% — best year 2019 (91.4%), worst 2016 (86.1%).
Figures count every completed test on this vehicle-year in the dataset, including retests. See methodology for the exact definition.
This page's data
- Tests analysed
- 989
- Typical mileage (median)
- 42,855 mi
- Make and model
- Infiniti Q30
- Updated
- 2026-11-05
Source: DVSA anonymised MOT test data (2023–2025), OGL v3.0.
Top part to budget for
Tyres
Usually a DIY or independent-garage job.
Does mileage affect the Q30 MOT pass rate?
Pass rate by odometer reading. Bar lengths start at 67% so small gaps stay visible.
Fuel type and reliability
Pass rate by fuel type. Petrol is the most common here (50% of tests).
Regional pass rates for the Q30
| Region | Tests | Pass rate |
|---|---|---|
| South East | 157 | 94.9% |
| North West | 145 | 91.7% |
| Yorkshire | 132 | 90.2% |
| North East | 129 | 90.7% |
| Scotland | 129 | 91.5% |
| West Midlands | 73 | 87.7% |
| East Midlands | 52 | 86.5% |
| London | 50 | 80.0% |
| East of England | 50 | 96.0% |
| South West | 49 | 85.7% |
| Wales | 23 | 95.7% |
Regions come from the postcode area recorded at the test station. Areas on region borders are assigned to the region with the majority of their population.
What fails a 2018 Q30
Everything a tester recorded on this vehicle, grouped into the inspection sections that produced it. The notch on each bar is the national share, so you can see at a glance whether this car is unusual or just ordinary.
A test can record several items, so these percentages do not add up to 100%. The exact strings, with prices, are in the full DVSA record at the bottom of this page.
Before your test
Three checks worth doing on a 2018 Q30
These are not generic tips — they are the faults recorded most often on this exact model, rewritten as things you can check yourself. All three take about ten minutes and cost nothing.
-
Check the tyre tread 1.4% of tests
“tread depth below requirements of 1.6mm”
Check all four tyres cold, including the inner shoulder where wear hides — 1.6mm across the central three-quarters is the legal limit, and most testers fail at 1.6mm without argument.
-
Check the windscreen 1.3% of tests
“windscreen damaged”
Check the driver’s side of the screen within the swept area for chips and cracks; anything larger than 10mm in the driver’s central view is a fail. Most chips can be resin-repaired for far less than a new screen.
-
Check the wipers and washers 1.0% of tests
“washers provides insufficient washer liquid”
Run the wipers with the screen wet: they should clear it in one sweep without smearing or juddering. Top the washer bottle up and check both jets hit the screen.
Shares are the proportion of tests on this vehicle that recorded the item, so they overlap: one test can record several.
What it costs to get a 2018 Q30 through its MOT
Across the 10 items that are recorded most often on this model, the average repair comes to £33–£78 — and 21% of those repairs are parts that cost under £30.
- Average repair across the 10 common items
- £33–£78
- Cheapest common item: malfunction indicator lamp inoperative or…
- £3–£12
- Dearest common item: windscreen damaged
- £80–£200
- Common items a careful owner can do at home
- 90%
- Repairs that still cost under £30
- 21%
Estimates from typical UK parts prices, weighted by how often each item appears in 989 MOT tests on this vehicle. They exclude diagnostics, retest fees and garage labour where the part is a DIY fit, and they are not figures from the DVSA dataset. Older and higher-mileage examples cost more than the average. How these estimates are built → · All MOT repair costs → · Cheapest cars to put through a test →
Every year of the Q30, side by side
4 model years on record, from 2016 to 2019. Across them the pass rate runs from 86.1% to 91.4% — a spread of 5.3 points. The bar under each year is the item that failed it most often.
- 2016 86.1% coil spring fractured or broken
- 2017 86.3% coil spring fractured or broken
- 2018 90.7%tread depth below requirements of…
- 2019 91.4% has a cut in excess of the…
Colour is the pass rate on a fixed scale, so a block means the same thing on any model. Each year links to its own page with the full fault breakdown.
Compare the 2018 Infiniti Q30 with another year
The raw pass rate mostly measures age. The year comparison adds the like-for-like figure, the mileage bands and the repair bill.
Other 2018 cars with a similar record
- Volkswagen Golf 90.7%
- BMW X1 90.7%
- BMW 6 Series 90.7%
- Hyundai I20 90.8%
- Hyundai Kona 90.8%
- Fiat 124 90.8%
Closest pass rates among 2018 cars with at least 2,000 tests, so a small sample cannot flatter itself into the list. See the full rankings: best and worst MOT pass rates.
The full DVSA record for the 2018 Infiniti Q30 10 failure items · 6 advisories · 10 inspection categories · mileage brackets · all of it in the page, none of it above the fold
Every inspection category
Shares of the 744 individual items recorded on this vehicle, and the same share across all cars nationally. A single test can record several items, so a row is not a percentage of tests.
| Category | Items | This car | Nationally | Difference |
|---|---|---|---|---|
| Tyres | 316 | 42.20% | 19.76% | +22.44 |
| Brakes | 229 | 30.60% | 20.89% | +9.71 |
| Non-component advisories | 45 | 6.00% | 4.18% | +1.82 |
| Suspension | 40 | 5.30% | 20.98% | −15.68 |
| Visibility | 39 | 5.20% | 4.97% | +0.23 |
| Lamps, reflectors and electrical equipment | 37 | 4.90% | 12.21% | −7.31 |
| Identification of the vehicle | 15 | 2.00% | 1.76% | +0.24 |
| Noise, emissions and leaks | 11 | 1.50% | 5.52% | −4.02 |
| Steering | 7 | 0.90% | 2.57% | −1.67 |
| Body, chassis, structure | 5 | 0.70% | 5.57% | −4.87 |
The exact failure items, in the tester's words
| Recorded item | Severity | Tests | Est. cost |
|---|---|---|---|
| Tread depth below requirements of 1.6mm Tyres | Major | 1.4% | £45–95 |
| Windscreen damaged but not adversely affecting driver's view Visibility | Minor | 1.3% | £80–200 |
| Washers provides insufficient washer liquid Visibility | Major | 1.0% | £5–15 |
| Linkage ball joint dust cover ball joint dust cover no longer prevents the ingress of dirt Suspension | Major | 0.81% | £18–45 |
| Brake pads less than 1.5 mm thick Brakes | Major | 0.61% | £18–45 |
| Malfunction indicator lamp inoperative or indicates a malfunction Noise, emissions and leaks | Major | 0.61% | £3–12 |
| Brake pads worn down to wear indicator Brakes | Major | 0.51% | £18–45 |
| Coil spring fractured or broken Suspension | Major | 0.51% | £25–65 |
| Has a cut in excess of the requirements deep enough to reach the ply or cords Tyres | Major | 0.51% | £45–95 |
| Linkage ball joint dust cover ball joint dust cover severely deteriorated Suspension | Minor | 0.51% | £18–45 |
Severity is as recorded: Major and Dangerous fail the test outright; Minor and Advisory do not. Costs are estimates from typical UK parts prices — see how they are built.
What testers noted without failing the car
Advisories are the early warnings — the same parts a year or two before they fail. Reading them is how you tell a car that has been maintained from one that has been patched.
| Recorded item | Severity | Tests | Est. cost |
|---|---|---|---|
| Tread depth below requirements of 1.6mm Tyres | Advisory | 13.3% | £45–95 |
| Has a tear, caused by separation or partial failure of its structure Tyres | Advisory | 11.6% | £45–95 |
| Brake discs in such a condition that it is seriously weakened Brakes | Advisory | 9.0% | £45–110 |
| Brake pads less than 1.5 mm thick Brakes | Advisory | 7.1% | £18–45 |
| Brake discs significantly and obviously worn Brakes | Advisory | 3.4% | £45–110 |
| Non-component advisories Nail in tyre Non-component advisories | Advisory | 2.0% | £45–95 |
Pass rate by mileage
| Mileage | Tests | Pass rate | Median odometer |
|---|---|---|---|
| 0-30k | 209 | 92.8% | 22,205 mi |
| 30-60k | 554 | 91.9% | 43,362 mi |
| 60-90k | 175 | 87.4% | 73,259 mi |
| 90-120k | 39 | 82.1% | 99,767 mi |
| 120k+ | 12 | 75.0% | 141,991 mi |
Source: 989 recorded tests on this vehicle-year. Every row above is recomputed from the same DVSA extract as the rest of the page — see the methodology.
2018 Q30 MOT questions
What is the MOT pass rate for a 2018 Infiniti Q30?
90.7% of the 989 2018 Infiniti Q30 tests in this dataset passed, against a national average of 87.9% for cars first used in 2018. First-attempt pass rate: 89.8%.
What are the most common MOT failures on a 2018 Infiniti Q30?
The three most recorded items are tread depth below requirements of 1.6mm (1.42%), windscreen damaged but not adversely affecting driver's view (1.31%), washers provides insufficient washer liquid (1.01%). Percentages are the share of tests on this vehicle that recorded the item.
Does mileage affect the 2018 Infiniti Q30 MOT pass rate?
Yes. Cars under 30,000 miles passed 92.8% of the time, falling to 75.0% for those over 120,000 miles. The median 2018 Infiniti Q30 in this dataset had covered 42,855 mi.
Which fuel type is most reliable for a 2018 Infiniti Q30?
Petrol: 91.7% pass rate across 495 tests. Diesel: 89.7% pass rate across 494 tests. Shares are of the tests on this vehicle that recorded each fuel type.
Does the season affect the 2018 Infiniti Q30 MOT pass rate?
Tests recorded in the winter months (October–March) passed 92.3% of the time; summer months (April–September) passed 88.5%. Brakes, tyres and lights are tested harder in bad weather, but the difference is small on most models.