10,114 tests in 2025
London Taxis International Tx4 reliability and MOT pass rate
77.7% passed first time. The 22.3% fail rate is 0.3 points better than the all-car average, on a median example 11 years old with 218,500 miles.
MOT pass rates / London Taxis International
Pass rate
77.7%
22.6% of all cars failed; 22.3% of these did.
Fixed on the day
10.2%
Passed after a defect was put right during the visit.
Median at test
218,500 mi
11 years old.
Fail rate by age
| Age at test | Tests | Fail rate |
|---|---|---|
| 3-5 years | 0 | — |
| 6-9 years | 2,490 | 17.7% |
| 10-13 years | 5,343 | 21.1% |
| 14+ years | 2,281 | 30% |
What the Tx4 fails on
Share of failed tests with at least one fail item in each DVSA inspection section. A test can fail in several sections at once.
- Suspension93 dangerous65.9%
- Lamps, reflectors and electrical equipment1 dangerous44.2%
- Brakes263 dangerous36.5%
- Noise, emissions and leaks11 dangerous20.8%
- Body, chassis, structure41 dangerous18.1%
- Steering33 dangerous16.6%
- Visibility11.5%
- Tyres282 dangerous11.4%
Is the Tx4 getting worse?
The fail rate fell 2.4 points to 22.4% from 2022 to 2025 while the median one tested aged 1 year. Ageing alone would predict about 2.7 points, so it is holding up better than the fleet average for its age.
| Year | Tests | Median age | Fail rate | All cars | |
|---|---|---|---|---|---|
| 2022 | 15,708 | 10 | 24.8% | 22.5% | |
| 2023 | 13,379 | 10 | 24.7% | 22.8% | |
| 2024 | 10,431 | 10 | 24.2% | 23.2% | |
| 2025 | 9,290 | 11 | 22.4% | 22.6% |
Fail rate is first attempts at class 4 tests. Median age is the age of a typical Tx4 at its test that year, and it is the number to watch: across the whole fleet each extra year of age adds roughly 1.9 points to the fail rate, so a model whose age and fail rate rise together is simply getting older.
The exact defects that fail it
Every failure item DVSA recorded against a Tx4 in 2025, counted by how many tests each one appeared on.
- 1Pins and bushes: pin or bush excessively worn809 tests
- 2Ball joint: ball joint excessively worn444 tests
- 3Rbt (sp): efficiency below requirements337 tests
- 4Position lamp: not working242 tests
- 5Shock absorbers: has an excessively worn bush218 tests
- 6Malfunction indicator lamp: inoperative or indicates a malfunction206 tests
- 7Ball joint dust cover: ball joint dust cover no longer prevents the ingress of dirt204 tests
- 8Coil spring: fractured or broken178 tests
What wears out first
Advisories are the tester flagging wear that is still legal. A typical Tx4 collects 2.62 of them per test, and these are the ones that come up most. Treat it as the running-repairs list for the next year or two.
- 1Engine oil leaks: leaking excessively from engine1,407 tests
- 2Pins and bushes: pin or bush excessively worn1,116 tests
- 3Tread depth: tread depth below requirements of 1.6mm831 tests
- 4Wheel bearings: has excessive play491 tests
- 5Rigid brake pipes: excessively corroded476 tests
- 6Ball joint: ball joint excessively worn460 tests
- 7Brake discs: in such a condition that it is seriously weakened453 tests
- 8Coil spring: corroded so that its cross sectional area is reduced and seriously weakened435 tests
Questions
What is the London Taxis International Tx4 MOT pass rate?
77.7% of the 10,114 London Taxis International Tx4 first-attempt MOTs in 2025 passed. The fail rate of 22.3% compares with 22.6% across all cars. A further 10.2% passed after a defect was fixed during the test visit.
What does a London Taxis International Tx4 usually fail on?
The single most common failure is "Pins and bushes: pin or bush excessively worn", recorded on 809 failed tests, followed by "Ball joint: ball joint excessively worn" and "Rbt (sp): efficiency below requirements". By section, suspension appears in 65.9% of failures, lamps, reflectors and electrical equipment appears in 44.2% of failures, brakes appears in 36.5% of failures.
Does age change the odds?
Sharply. At 3 to 5 years old the fail rate was n/a%; at 14+ years it was 30%. The median London Taxis International Tx4 tested in 2025 was 11 years old with 218,500 miles.
Is the London Taxis International Tx4 getting less reliable?
The fail rate fell 2.4 points to 22.4% from 2022 to 2025 while the median one tested aged 1 year. Ageing alone would predict about 2.7 points, so it is holding up better than the fleet average for its age.
First-attempt class 4 tests, 2025, from DVSA’s anonymised MOT data (OGL v3, retrieved 2026-09-12). DVSA records newer cars trim by trim; this page adds every Tx4 trim together. Year-on-year figures come from the same DVSA extracts for 2026 and earlier years. Full method on the pass rates hub.
Checking a particular Tx4?
The odds above are the model. The car in front of you has its own record: every test, every advisory, the mileage at each one.
Due a test? Find an approved MOT station near you.