How reliable is the London Taxis Int TX4 compared with other cars?

We do not publish a comparison for the London Taxis Int TX4, because the cars of this model that have been tested do not cover a wide enough range of ages and mileages. Its raw pass rate is 67.5% across 10,429 tests, but comparing a raw rate between models mostly ranks them by how new they are rather than how good they are. The failure and advisory patterns further down the page are still drawn from real tests and are worth reading.

What is the most common MOT failure on a London Taxis Int TX4?

The item recorded most often is "A suspension pin, bush or joint excessively worn", which appears in 46.0% of failed London Taxis Int TX4 tests. Because one failed test can list several items, these shares do not add up to 100%.

What do testers most often warn about on a London Taxis Int TX4?

The most common advisory is "Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users", noted on 13.9% of all London Taxis Int TX4 tests. An advisory is not a failure: it flags something that will likely need attention before the next test.

What mileage does a London Taxis Int TX4 usually have at its MOT?

The average odometer reading recorded at test is 229,020 miles. This is the mileage across all tested examples of every age, not an annual figure, so treat it as a description of the fleet rather than a target for one car.

Which London Taxis Int TX4 years are the most reliable?

Going by MOT pass rate, London Taxis Int TX4 cars first registered 2017–2019 do best at 72.5%, and those registered 2010 and earlier do worst at 66.3%. But that ordering is mostly age, not build year: almost every model passes less often as it wears, so the newest cars top this list whatever they are. A specific year looking strong here means little on its own; the failure items above, and the individual car's own MOT history, tell you far more.

Does a London Taxis Int TX4 get harder to pass as it ages?

Yes. At 6 to 8 years old, 72.5% of London Taxis Int TX4 tests pass. By fifteen years or more, that falls to 66.3%. Nearly every model follows this pattern, which is why comparing raw pass rates between models is misleading unless age is accounted for.

Are most London Taxis Int TX4 models petrol or diesel?

Of the London Taxis Int TX4 cars tested, 97% are diesel, 2% are lpg, 1% are petrol and gas bi-fuel. Fuel type affects which items tend to fail, particularly emissions and exhaust components.

Model reliability file

London Taxis Int TX4 MOT pass rate & common failures

From 10,429 recorded MOT tests of the London Taxis Int TX4, published by DVSA.

Data updated 29 July 2026

Quick answer

Across 10,429 MOT tests, 67.5% of London Taxis Int TX4 tests ended in a pass. This figure is not adjusted for age or mileage, so it is not a reliability ranking: the London Taxis Int TX4 fleet does not yet cover a wide enough spread of ages and distances to compare it fairly against other models. Its most commonly recorded failure is suspension pin, bush or joint excessively worn, which appears in 46.0% of failed tests. Cars of this model average 229,020 miles on the odometer when tested.

At a glance

Recorded pass rate

67.5%unadjusted, not comparable10,429 tests

We are not publishing a ranking for the TX4. The examples tested do not cover a wide enough spread of ages and mileages to compare it fairly, and an unadjusted pass rate mostly sorts models by how recently they were bought rather than how well they were built. The failure and advisory patterns below come from the same 10,429 tests and are worth reading on their own terms.

DVSA recorded wording

Most common failure items

Share of failed London Taxis Int TX4 tests in which each item was recorded. One failed test often lists several items, so these do not sum to 100%.

1.A suspension pin, bush or joint excessively worn46.0%
1,064 occurrencesSuspension arm bush worn explained
2.A suspension pin, bush or joint excessively worn20.6%
476 occurrencesSuspension arm bush worn explained
3.Parking brake efficiency below minimum requirement15.2%
352 occurrencesParking brake efficiency too low explained
4.A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning12.7%
293 occurrencesLamp not working explained
5.A shock absorber bush excessively worn11.9%
276 occurrencesShock absorber defective explained
6.A wheel bearing with excessive play9.5%
220 occurrencesWheel bearing has excessive play or is rough explained
7.Tyre tread depth not in accordance with the requirements8.7%
202 occurrencesTyre worn close to the legal limit explained
8.A spring or spring component fractured or seriously weakened8.6%
200 occurrencesRoad spring broken or fractured explained
9.A suspension joint dust cover missing or no longer prevents the ingress of dirt etc7.9%
183 occurrencesSuspension joint dust cover missing or split explained
10.The aim of a headlamp is not within limits laid down in the requirements7.8%
180 occurrencesHeadlamp aim incorrect explained

Warnings without a failure

Most common advisories

Share of all London Taxis Int TX4 tests carrying each advisory. The denominator differs from the failure list above because an advisory can be issued on a car that passed.

1.Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users13.9%
1,450 tests
2.A suspension pin, bush or joint excessively worn13.2%
1,373 testsSuspension arm bush worn explained
3.Tyre tread depth not in accordance with the requirements10.3%
1,072 testsTyre worn close to the legal limit explained
4.A wheel bearing with excessive play6.7%
694 testsWheel bearing has excessive play or is rough explained
5.Brake pipe damaged or excessively corroded5.8%
610 testsBrake pipe corroded explained
6.A spring or spring component fractured or seriously weakened5.1%
537 testsRoad spring broken or fractured explained
7.Brake disc or drum excessively weakened, insecure or fractured5.0%
522 testsBrake disc worn, pitted or scored explained
8.A shock absorber bush excessively worn4.2%
433 testsShock absorber defective explained

The rest of the record

Everything else recorded on the London Taxis Int TX4

The 19 other defects testers recorded on this model, beyond the most common listed above. Each links to what it means and what it takes to put right.

Known faults

London Taxis Int TX4 common problems, by part and by year

The same failure record read the way a buyer asks the question: which parts wear out on a TX4, when they start, and how each registration year compares — including the steps that mark a generation change.

TX4 common problems and results by year

How wear changes the picture

TX4 pass rate by age and registration year

How often the London Taxis Int TX4 passes at each age, with the years those cars were first registered. Tests are from 2025, so a car aged 6 to 8 was first used in 2017–2019.

6–8 yrsreg. 2017–201972%

9–11 yrsreg. 2014–201667%

12–14 yrsreg. 2011–201368%

15+ yrsreg. 2010 and earlier66%

Read this as an age curve rather than a verdict on particular model years. Nearly every car passes less often as it gets older, so a newer TX4 outscoring an older one says more about wear than about how that year’s cars were built. Bands holding too few tests to be meaningful are omitted rather than shown as a rate.

What gets tested

The TX4 fleet

Average mileage recorded at test: 229,020
Fuel mix of tested cars: Diesel97.3%
LPG1.9%
Petrol and gas bi-fuel0.5%

Trim names grouped into this model (8)

Recorded exactly as DVSA holds them. Trim-level names are rolled up so one model is not split across a dozen thin pages.

TX4 ELEGANCE
TX4 ELEGANCE AUTO
TX4 LIMITED EDITION AUTO
TX4 SILVER
TX4 SILVER AUTO
TX4 STYLE
TX4 STYLE AUTO
TX4 STYLE MANUAL

Check a specific London Taxis Int TX4

A model average tells you the pattern. Its own MOT record tells you the car.

Common questions

How reliable is the London Taxis Int TX4 compared with other cars?: We do not publish a comparison for the London Taxis Int TX4, because the cars of this model that have been tested do not cover a wide enough range of ages and mileages. Its raw pass rate is 67.5% across 10,429 tests, but comparing a raw rate between models mostly ranks them by how new they are rather than how good they are. The failure and advisory patterns further down the page are still drawn from real tests and are worth reading.
What is the most common MOT failure on a London Taxis Int TX4?: The item recorded most often is "A suspension pin, bush or joint excessively worn", which appears in 46.0% of failed London Taxis Int TX4 tests. Because one failed test can list several items, these shares do not add up to 100%.
What do testers most often warn about on a London Taxis Int TX4?: The most common advisory is "Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users", noted on 13.9% of all London Taxis Int TX4 tests. An advisory is not a failure: it flags something that will likely need attention before the next test.
What mileage does a London Taxis Int TX4 usually have at its MOT?: The average odometer reading recorded at test is 229,020 miles. This is the mileage across all tested examples of every age, not an annual figure, so treat it as a description of the fleet rather than a target for one car.
Which London Taxis Int TX4 years are the most reliable?: Going by MOT pass rate, London Taxis Int TX4 cars first registered 2017–2019 do best at 72.5%, and those registered 2010 and earlier do worst at 66.3%. But that ordering is mostly age, not build year: almost every model passes less often as it wears, so the newest cars top this list whatever they are. A specific year looking strong here means little on its own; the failure items above, and the individual car's own MOT history, tell you far more.
Does a London Taxis Int TX4 get harder to pass as it ages?: Yes. At 6 to 8 years old, 72.5% of London Taxis Int TX4 tests pass. By fifteen years or more, that falls to 66.3%. Nearly every model follows this pattern, which is why comparing raw pass rates between models is misleading unless age is accounted for.
Are most London Taxis Int TX4 models petrol or diesel?: Of the London Taxis Int TX4 cars tested, 97% are diesel, 2% are lpg, 1% are petrol and gas bi-fuel. Fuel type affects which items tend to fail, particularly emissions and exhaust components.

How this was worked out

Method and limits

Figures come from the DVSA anonymised MOT testing dataset, published under the Open Government Licence. Only class 4 initial tests are counted: retests are excluded so a car appears once, and abandoned tests are excluded entirely. No adjusted rate is shown because this model's tested examples do not cover enough of the national age and mileage range for standardisation to mean anything.

An MOT measures whether a car met a legal standard on the day. It is not a breakdown record, a service history or a running-cost estimate, and a pass rate is a property of a fleet rather than a prediction about one car.