Infiniti Fx MOT pass rate & common failures
2,335 MOT tests on the Infiniti Fx (2003–2021) give it an 86.3% pass rate. Against all cars of a similar age (22.1% fail rate), the Fx comes out 8.4pp better. Its most common failure areas are lighting & signalling, tyres and emissions & environmental.
What the MOT record shows
No single area dominates — lighting & signalling (6.9%) and tyres (4.5%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are position lamp, tread depth and malfunction indicator lamp — position lamp alone was recorded 87 times.
Mileage is the strongest signal on the record: 10.0% of 30-60k cars fail, rising to 18.8% once past 150k.
Fuel type barely separates them — diesel fails 13.4% of the time against 14.6% for petrol.
Tyres is the most common advisory, noted on 21.0% of tests — work that passed today but is likely due soon.
The trend is worsening — 10.5% of tests failed in 2021 against 15.5% in 2025, the usual pattern as a fleet ages.
How it compares
By model year
Every Fx model year with a usable sample. Years with their own detailed report are linked.
| Year | Tests | Pass rate | Fail rate | Most common failure |
|---|---|---|---|---|
| 2009 | 50 | 80.0% | 20.0% | Lighting & signalling |
| 2010 | 361 | 87.8% | 12.2% | Lighting & signalling |
| 2011 | 712 | 86.7% | 13.3% | Lighting & signalling |
| 2012 | 612 | 85.8% | 14.2% | Lighting & signalling |
| 2013 | 504 | 87.3% | 12.7% | Tyres |
| 2014 | 54 | 88.9% | 11.1% | Tyres |
Most common failures (all years)
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 6.9% | 162 |
| 2 | Tyres | 4.5% | 104 |
| 3 | Emissions & environmental | 3.7% | 86 |
| 4 | Suspension | 3.4% | 80 |
| 5 | Visibility | 3.3% | 76 |
| 6 | Brakes | 3.2% | 74 |
| 7 | Body, structure & corrosion | 1.3% | 31 |
| 8 | Other defects | 0.9% | 21 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Position lamp | 87 |
| 2 | Tread depth | 86 |
| 3 | Malfunction indicator lamp | 67 |
| 4 | Washers | 58 |
| 5 | Ball joint | 52 |
| 6 | Rear fog lamp | 40 |
| 7 | Headlamp aim | 37 |
| 8 | Registration plates | 36 |
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 | 21.0% | 491 |
| 2 | Suspension | 16.1% | 376 |
| 3 | Brakes | 16.0% | 374 |
| 4 | Emissions & environmental | 6.2% | 144 |
| 5 | Other defects | 5.0% | 116 |
| 6 | Lighting & signalling | 4.1% | 95 |
Failure rate by mileage
Higher-mileage cars tend to fail more — often the most useful guide to real condition.
| Mileage band | Tests | Fail rate |
|---|---|---|
| 30-60k | 250 | 10.0% |
| 60-90k | 800 | 10.5% |
| 90-120k | 808 | 16.3% |
| 120-150k | 347 | 15.6% |
| 150k+ | 112 | 18.8% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Diesel | 1,726 | 13.4% |
| Petrol | 608 | 14.6% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 497 | 10.5% |
| 2022 | 497 | 12.9% |
| 2023 | 482 | 15.3% |
| 2024 | 445 | 14.8% |
| 2025 | 414 | 15.5% |
What to check before buying a Infiniti Fx
- Lighting & signalling (6.9% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Tyres (4.5% 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.
- Emissions & environmental (3.7% of tests): More common on older diesels (DPF/EGR) — can be expensive; check for warning lights and smoke. Typical repair: £100–£600.
Repair costs are rough UK ballpark ranges to set expectations, not quotes — actual prices vary widely by car, parts and garage.
Frequently asked questions
What is the MOT pass rate for the Infiniti Fx?
86.3% of the 2,335 Infiniti Fx MOT tests in this dataset passed, a 13.7% fail rate, across model years 2003–2021.
What does the Infiniti Fx most often fail its MOT on?
Lighting & signalling, recorded in 6.9% of tests, then tyres (4.5%).
How much does mileage affect Fx MOT results?
Fail rates run at 10.0% for cars in the 30-60k band and 18.8% for 150k+, a 8.8-point difference.
Is the diesel or petrol Fx more reliable at MOT time?
On MOT-testable defects the diesel fails 13.4% of the time against 14.6% for the petrol. This covers testable items only, not engine or gearbox reliability.
Methodology & source. Based on 2,335 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.