2014 London Taxis Int Tx4 — MOT failures & pass rate
Across 13,727 MOT tests, the 2014 London Taxis Int Tx4 recorded an 81.2% pass rate. All cars of a similar age fail at 18.3%, so the 2014 Tx4 sits squarely on the average. Failures cluster in lighting & signalling, suspension and brakes.
What the MOT record shows
No single area dominates — lighting & signalling (15.8%) and suspension (15.3%) 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 1,505 times.
Mileage matters less than usual here: the 2014 Tx4 fails 22.2% of the time in the 0-30k band and 19.6% at 150k+, a spread of only 2.6 points.
Advisories point at the next bill rather than this one: suspension was flagged on 22.6% of tests without failing them.
The trend is improving — the fail rate fell from 20.3% in 2021 to 17.6% in 2025, as the worst-kept examples leave the fleet.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Lighting & signalling | 15.8% | 2,171 |
| 2 | Suspension | 15.3% | 2,102 |
| 3 | Brakes | 8.7% | 1,195 |
| 4 | Emissions & environmental | 6.7% | 917 |
| 5 | Visibility | 5.7% | 788 |
| 6 | Tyres | 3.9% | 539 |
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 | 1,505 |
| 2 | Headlamp aim | 735 |
| 3 | Ball joint | 694 |
| 4 | Malfunction indicator lamp | 661 |
| 5 | Position lamp | 563 |
| 6 | Washers | 493 |
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 | 22.6% | 3,106 |
| 2 | Emissions & environmental | 13.9% | 1,914 |
| 3 | Brakes | 13.5% | 1,853 |
| 4 | Tyres | 11.3% | 1,545 |
| 5 | Steering | 7.2% | 994 |
| 6 | Lighting & signalling | 6.0% | 820 |
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 | 108 | 22.2% |
| 30-60k | 77 | 11.7% |
| 60-90k | 257 | 12.8% |
| 90-120k | 996 | 17.4% |
| 120-150k | 1,975 | 16.2% |
| 150k+ | 10,291 | 19.6% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Diesel | 13,613 | 18.8% |
| Petrol | 85 | 25.9% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 2,728 | 20.3% |
| 2022 | 2,848 | 20.3% |
| 2023 | 2,788 | 18.2% |
| 2024 | 2,734 | 17.5% |
| 2025 | 2,629 | 17.6% |
What to check before buying a 2014 Tx4
On a 2014 Tx4, lighting & signalling is what the MOT record says goes wrong most — it appeared in 15.8% of tests. Check these areas before you commit.
- Lighting & signalling (15.8% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Suspension (15.3% 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 (8.7% 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 2014 London Taxis Int Tx4s pass their MOT?
81.2% of the 13,727 2014 London Taxis Int Tx4 MOT tests in this dataset passed — a 18.8% fail rate.
What is the most common MOT failure on a 2014 London Taxis Int Tx4?
Lighting & signalling, recorded in 15.8% of tests, followed by suspension (15.3%).
Does the 2014 Tx4 get worse with mileage?
Its MOT fail rate rises from 22.2% in the 0-30k band to 19.6% in the 150k+ band.
Methodology & source. Based on 13,727 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.