2011 London Taxis Int Tx4 — MOT failures & pass rate
The 2011 London Taxis Int Tx4 passed 77.1% of its 8,997 recorded MOT tests. That is effectively the same as all cars of a similar age (22.6% fail rate), so the MOT record here is unremarkable in either direction. Failures cluster in suspension, lighting & signalling and brakes.
What the MOT record shows
No single area dominates — suspension (15.0%) and lighting & signalling (14.3%) are close, so failures are spread across several systems rather than one weak point.
At component level the recurring items are pins and bushes, ball joint and track rod end — pins and bushes alone was recorded 818 times.
Condition tracks the odometer closely. Failures run at 29.2% in the 0-30k band and 23.4% in the 150k+ band, a 5.8-point spread.
Suspension is the most common advisory, noted on 18.5% of tests — work that passed today but is likely due soon.
The trend is worsening — 21.3% of tests failed in 2021 against 23.6% in 2025, the usual pattern as a fleet ages.
How it compares
Top failure categories
| # | Category | % of tests affected | Tests |
|---|---|---|---|
| 1 | Suspension | 15.0% | 1,350 |
| 2 | Lighting & signalling | 14.3% | 1,289 |
| 3 | Brakes | 10.9% | 980 |
| 4 | Steering | 7.3% | 659 |
| 5 | Emissions & environmental | 5.7% | 516 |
| 6 | Body, structure & corrosion | 4.7% | 421 |
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 | 818 |
| 2 | Ball joint | 657 |
| 3 | Track rod end | 568 |
| 4 | Headlamp aim | 497 |
| 5 | Rbt (sp) | 494 |
| 6 | Headlamp | 338 |
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 | 18.5% | 1,664 |
| 2 | Emissions & environmental | 16.3% | 1,469 |
| 3 | Brakes | 13.7% | 1,233 |
| 4 | Tyres | 11.0% | 992 |
| 5 | Steering | 8.4% | 755 |
| 6 | Lighting & signalling | 7.6% | 685 |
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 | 48 | 29.2% |
| 30-60k | 52 | 15.4% |
| 60-90k | 66 | 19.7% |
| 90-120k | 170 | 17.1% |
| 120-150k | 335 | 14.0% |
| 150k+ | 8,268 | 23.4% |
Failure rate by age
By fuel type
| Fuel | Tests | Fail rate |
|---|---|---|
| Diesel | 8,572 | 22.5% |
| Petrol | 346 | 30.3% |
| Gas/LPG | 79 | 26.6% |
Trend over time
| Dataset year | Tests | Fail rate |
|---|---|---|
| 2021 | 2,311 | 21.3% |
| 2022 | 2,680 | 21.8% |
| 2023 | 1,787 | 23.2% |
| 2024 | 1,207 | 27.2% |
| 2025 | 1,012 | 23.6% |
What to check before buying a 2011 Tx4
The failure pattern for this year is specific enough to inspect against: suspension accounted for 15.0% of tests. Start there.
- Suspension (15.0% 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.
- Lighting & signalling (14.3% of tests): Often a cheap bulb, but persistent issues can mean wiring or corrosion in the units. Typical repair: £10–£150.
- Brakes (10.9% 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 2011 London Taxis Int Tx4s pass their MOT?
77.1% of the 8,997 2011 London Taxis Int Tx4 MOT tests in this dataset passed — a 22.9% fail rate.
What is the most common MOT failure on a 2011 London Taxis Int Tx4?
Suspension, recorded in 15.0% of tests, followed by lighting & signalling (14.3%).
Does the 2011 Tx4 get worse with mileage?
Its MOT fail rate rises from 29.2% in the 0-30k band to 23.4% in the 150k+ band.
Methodology & source. Based on 8,997 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.