How reliable is the Lexus LS400 compared with other cars?

We do not publish a comparison for the Lexus LS400, because the cars of this model that have been tested do not cover a wide enough range of ages and mileages.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 73.9% across 783 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 do testers most often warn about on a Lexus LS400?

The most common advisory is "Tyre tread depth not in accordance with the requirements", noted on 23.8% of all Lexus LS400 tests. An advisory is not a failure: it flags something that will likely need attention before the next test.

What mileage does a Lexus LS400 usually have at its MOT?

The average odometer reading recorded at test is 143,842 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.

Are most Lexus LS400 models petrol or diesel?

Of the Lexus LS400 cars tested, 97% are petrol, 3% are lpg. Fuel type affects which items tend to fail, particularly emissions and exhaust components.

Model reliability file

Lexus LS400 MOT pass rate & common failures

From 783 recorded MOT tests of the Lexus LS400, published by DVSA.

Data updated 29 July 2026

Quick answer

Across 783 MOT tests, 73.9% of Lexus LS400 tests ended in a pass. This figure is not adjusted for age or mileage, so it is not a reliability ranking: the Lexus LS400 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 strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired, which appears in 18.4% of failed tests. Cars of this model average 143,842 miles on the odometer when tested.

At a glance

Recorded pass rate

73.9%unadjusted, not comparable783 tests

We are not publishing a ranking for the LS400. 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 783 tests and are worth reading on their own terms.

DVSA recorded wording

Most common failure items

Share of failed Lexus LS400 tests in which each item was recorded. One failed test often lists several items, so these do not sum to 100%.

1.The strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired18.4%
32 occurrencesSuspension mounting corroded or insecure explained
2.A suspension pin, bush or joint excessively worn16.7%
29 occurrencesSuspension arm bush worn explained
3.A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning16.1%
28 occurrencesLamp not working explained
4.A spring or spring component fractured or seriously weakened16.1%
28 occurrencesRoad spring broken or fractured explained
5.Brake pipe damaged or excessively corroded12.1%
21 occurrencesBrake pipe corroded explained
6.Lambda coefficient outside the default limits or the range specified by the manufacturer11.5%
20 occurrencesEmissions above the permitted limit explained
7.Exhaust system leaking or insecure9.8%
17 occurrencesExhaust leaking or insecure explained
8.The aim of a headlamp is not within limits laid down in the requirements8.6%
15 occurrencesHeadlamp aim incorrect explained
9.Wiper blade missing or obviously not clearing the windscreen8.6%
15 occurrencesWiper or washer not working properly explained
10.Tyre tread depth not in accordance with the requirements8.6%
15 occurrencesTyre worn close to the legal limit explained

Warnings without a failure

Most common advisories

Share of all Lexus LS400 tests carrying each advisory. The denominator differs from the failure list above because an advisory can be issued on a car that passed.

1.Tyre tread depth not in accordance with the requirements23.8%
186 testsTyre worn close to the legal limit explained
2.A suspension pin, bush or joint excessively worn15.1%
118 testsSuspension arm bush worn explained
3.Brake pipe damaged or excessively corroded13.5%
106 testsBrake pipe corroded explained
4.A tyre seriously damaged13.2%
103 testsTyre damaged or deteriorated explained
5.Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users12.8%
100 tests
6.A suspension component excessively damaged or corroded12.1%
95 testsSuspension mounting corroded or insecure explained
7.Brake disc or drum excessively weakened, insecure or fractured11.0%
86 testsBrake disc worn, pitted or scored explained
8.A suspension pin, bush or joint excessively worn11.0%
86 testsSuspension arm bush worn explained

What gets tested

The LS400 fleet

Average mileage recorded at test: 143,842
Fuel mix of tested cars: Petrol97.1%
LPG2.8%

Check a specific Lexus LS400

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

Compare within the range

Other Lexus models

Lexus NX — 89.3% adjusted
Lexus CT — 85.0% adjusted
Lexus RX — 88.2% adjusted
Lexus UX — 93.7% unadjusted
Lexus IS — 84.3% adjusted
Lexus IS250 — 73.7% unadjusted
All Lexus models

Common questions

How reliable is the Lexus LS400 compared with other cars?: We do not publish a comparison for the Lexus LS400, 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 73.9% across 783 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 Lexus LS400?: The item recorded most often is "The strength or continuity of the load bearing structure within 30cm of any sub-frame, spring or suspension component mounting (a 'prescribed area') is significantly reduced or inadequately repaired", which appears in 18.4% of failed Lexus LS400 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 Lexus LS400?: The most common advisory is "Tyre tread depth not in accordance with the requirements", noted on 23.8% of all Lexus LS400 tests. An advisory is not a failure: it flags something that will likely need attention before the next test.
What mileage does a Lexus LS400 usually have at its MOT?: The average odometer reading recorded at test is 143,842 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.
Are most Lexus LS400 models petrol or diesel?: Of the Lexus LS400 cars tested, 97% are petrol, 3% are lpg. 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.