2017 Infiniti Q30 — MOT failures & pass rate
14,201 MOT tests on the 2017 Infiniti Q30 are in this dataset, and 88.5% of them passed. That is effectively the same as small family cars of a similar age (12.0% fail rate), so the MOT record here is unremarkable in either direction. Failures cluster in tyres, lighting & signalling and suspension.
What the MOT record shows
No single area dominates — tyres (4.1%) and lighting & signalling (3.3%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are tread depth, brake pads and headlamp — tread depth alone was recorded 378 times.
Mileage is the strongest signal on the record: 6.0% of 0-30k cars fail, rising to 27.3% once past 150k — 4.5× the risk.
The petrol cars hold up better: 10.1% fail against 11.9% for diesel, a 1.8-point gap across 14,201 tests.
Tyres is the most common advisory, noted on 28.3% of tests — work that passed today but is likely due soon.
The trend is worsening — 6.9% of tests failed in 2021 against 16.4% in 2025, the usual pattern as a fleet ages.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Tyres | 4.1% | 577 |
| 2 | Lighting & signalling | 3.3% | 462 |
| 3 | Suspension | 3.1% | 439 |
| 4 | Brakes | 2.7% | 386 |
| 5 | Visibility | 2.1% | 296 |
| 6 | Emissions & environmental | 1.0% | 146 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Tread depth | 378 |
| 2 | Brake pads | 304 |
| 3 | Headlamp | 248 |
| 4 | Coil spring | 231 |
| 5 | Headlamp aim | 227 |
| 6 | Washers | 218 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Tyres | 28.3% | 4,014 |
| 2 | Brakes | 17.5% | 2,487 |
| 3 | Other defects | 7.3% | 1,040 |
| 4 | Suspension | 4.1% | 586 |
| 5 | Visibility | 2.0% | 288 |
| 6 | Lighting & signalling | 1.5% | 214 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 0-30k | 2,632 | 6.0% |
| 30-60k | 7,634 | 10.7% |
| 60-90k | 3,196 | 16.1% |
| 90-120k | 621 | 20.4% |
| 120-150k | 85 | 14.1% |
| 150k+ | 33 | 27.3% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Diesel | 11,400 | 11.9% |
| Petrol | 2,801 | 10.1% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 2,731 | 6.9% |
| 2022 | 2,800 | 9.3% |
| 2023 | 2,827 | 11.5% |
| 2024 | 2,892 | 13.1% |
| 2025 | 2,951 | 16.4% |
What to check before buying a 2017 Q30
The failure pattern for this year is specific enough to inspect against: tyres accounted for 4.1% of tests. Start there.
- Tyres (4.1% of tests): Usually a quick, known-cost fix, but check tread, age and uneven wear (which can hint at alignment or suspension issues). Typical repair: £50–£120 per tyre.
- Lighting & signalling (3.3% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Suspension (3.1% of tests): Worn drop links, bushes, springs or shocks — listen for knocks over bumps and check for uneven tyre wear. Typical repair: £150–£450 per corner.
Repair costs are rough UK ballpark ranges to set expectations, not quotes — actual prices vary widely by car, parts and garage.
Frequently asked questions
How many 2017 Infiniti Q30s pass their MOT?
88.5% of the 14,201 2017 Infiniti Q30 MOT tests in this dataset passed — a 11.5% fail rate.
What is the most common MOT failure on a 2017 Infiniti Q30?
Tyres, recorded in 4.1% of tests, followed by lighting & signalling (3.3%).
Does the 2017 Q30 get worse with mileage?
Its MOT fail rate rises from 6.0% in the 0-30k band to 27.3% in the 150k+ band.
Methodology & source. Based on 14,201 MOT tests. Dataset: DVSA MOT testing data (2021,2022,2023,2024,2025). Data last updated 2026-07-27. Figures reflect MOT-testable defects only — read the methodology for how these are calculated and what they don't measure.