2015 London Taxis Int Tx4 — MOT failures & pass rate
12,243 MOT tests on the 2015 London Taxis Int Tx4 are in this dataset, and 84.3% of them passed. That is effectively the same as all cars of a similar age (16.4% fail rate), so the MOT record here is unremarkable in either direction. Failures cluster in lighting & signalling, suspension and brakes.
What the MOT record shows
No single area dominates — lighting & signalling (13.8%) and suspension (13.0%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are pins and bushes, headlamp aim and ball joint — pins and bushes alone was recorded 1,022 times.
Mileage matters less than usual here: the 2015 Tx4 fails 19.3% of the time in the 0-30k band and 16.8% at 150k+, a spread of only 2.5 points.
Suspension is the most common advisory, noted on 22.4% of tests — work that passed today but is likely due soon.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 13.8% | 1,686 |
| 2 | Suspension | 13.0% | 1,592 |
| 3 | Brakes | 7.7% | 939 |
| 4 | Emissions & environmental | 5.3% | 645 |
| 5 | Visibility | 4.4% | 543 |
| 6 | Tyres | 3.5% | 433 |
Most common specific failures
The exact components most often recorded as failures — more specific than the categories above.
| # | Failure item | Times recorded |
|---|---|---|
| 1 | Pins and bushes | 1,022 |
| 2 | Headlamp aim | 578 |
| 3 | Ball joint | 495 |
| 4 | Malfunction indicator lamp | 462 |
| 5 | Position lamp | 432 |
| 6 | Headlamp | 389 |
Top advisory categories
Advisories aren't failures, but they flag work likely needed soon — useful when budgeting.
| # | Category | % of tests with advisory | Tests |
|---|---|---|---|
| 1 | Suspension | 22.4% | 2,749 |
| 2 | Brakes | 13.6% | 1,661 |
| 3 | Emissions & environmental | 12.6% | 1,542 |
| 4 | Tyres | 10.7% | 1,310 |
| 5 | Steering | 8.0% | 978 |
| 6 | Lighting & signalling | 5.2% | 632 |
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 | 145 | 19.3% |
| 30-60k | 159 | 12.6% |
| 60-90k | 550 | 11.3% |
| 90-120k | 1,455 | 12.7% |
| 120-150k | 2,513 | 15.0% |
| 150k+ | 7,403 | 16.8% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Diesel | 12,167 | 15.6% |
| Petrol | 59 | 33.9% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 2,361 | 15.1% |
| 2022 | 2,494 | 16.1% |
| 2023 | 2,492 | 15.8% |
| 2024 | 2,457 | 15.5% |
| 2025 | 2,439 | 15.9% |
What to check before buying a 2015 Tx4
The failure pattern for this year is specific enough to inspect against: lighting & signalling accounted for 13.8% of tests. Start there.
- Lighting & signalling (13.8% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Suspension (13.0% 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.
- Brakes (7.7% of tests): Pads/discs are routine wear; binding, imbalance or corroded pipes are more serious — test for pulling under braking. Typical repair: £100–£350 per axle.
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 2015 London Taxis Int Tx4s pass their MOT?
84.3% of the 12,243 2015 London Taxis Int Tx4 MOT tests in this dataset passed — a 15.7% fail rate.
What is the most common MOT failure on a 2015 London Taxis Int Tx4?
Lighting & signalling, recorded in 13.8% of tests, followed by suspension (13.0%).
Does the 2015 Tx4 get worse with mileage?
Its MOT fail rate rises from 19.3% in the 0-30k band to 16.8% in the 150k+ band.
Methodology & source. Based on 12,243 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.