How reliable is the Lexus GS300 compared with other cars?

We do not publish a comparison for the Lexus GS300, because the cars of this model that have been tested do not cover a wide enough range of ages and mileages.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 71.7% across 2,298 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 GS300?

The most common advisory is "Tyre tread depth not in accordance with the requirements", noted on 22.8% of all Lexus GS300 tests. An advisory is not a failure: it flags something that will likely need attention before the next test.

What mileage does a Lexus GS300 usually have at its MOT?

The average odometer reading recorded at test is 115,781 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.

Model reliability file

Lexus GS300 MOT pass rate & common failures

From 2,298 recorded MOT tests of the Lexus GS300, published by DVSA.

Data updated 29 July 2026

Quick answer

Across 2,298 MOT tests, 71.7% of Lexus GS300 tests ended in a pass. This figure is not adjusted for age or mileage, so it is not a reliability ranking: the Lexus GS300 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 lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning, which appears in 13.9% of failed tests. Cars of this model average 115,781 miles on the odometer when tested.

At a glance

Recorded pass rate

71.7%unadjusted, not comparable2,298 tests

We are not publishing a ranking for the GS300. 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 2,298 tests and are worth reading on their own terms.

DVSA recorded wording

Most common failure items

Share of failed Lexus GS300 tests in which each item was recorded. One failed test often lists several items, so these do not sum to 100%.

1.A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning13.9%
71 occurrencesLamp not working explained
2.Engine MIL illuminated indicating a malfunction13.5%
69 occurrencesEngine management light on, or not working explained
3.A brake lining or pad worn below 1.5mm12.3%
63 occurrencesBrake drum or shoe worn or contaminated explained
4.A shock absorber damaged to the extent that it does not function or showing signs of severe leakage12.3%
63 occurrencesShock absorber defective explained
5.ESC MIL indicates a system malfunction11.9%
61 occurrences
6.Tyre tread depth not in accordance with the requirements11.1%
57 occurrencesTyre worn close to the legal limit explained
7.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 repaired9.2%
47 occurrencesSuspension mounting corroded or insecure explained
8.The aim of a headlamp is not within limits laid down in the requirements9.0%
46 occurrencesHeadlamp aim incorrect explained
9.Exhaust system leaking or insecure8.8%
45 occurrencesExhaust leaking or insecure explained
10.A headlamp or light source missing, inoperative or more than ½ not functioning in the case of LED8.0%
41 occurrencesHeadlamp not working explained

Warnings without a failure

Most common advisories

Share of all Lexus GS300 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 requirements22.8%
524 testsTyre worn close to the legal limit explained
2.A suspension pin, bush or joint excessively worn13.2%
303 testsSuspension arm bush worn explained
3.A tyre seriously damaged12.5%
288 testsTyre damaged or deteriorated explained
4.Brake disc or drum excessively weakened, insecure or fractured12.2%
281 testsBrake disc worn, pitted or scored explained
5.A shock absorber damaged to the extent that it does not function or showing signs of severe leakage11.4%
263 testsShock absorber defective explained
6.A brake lining or pad worn below 1.5mm11.4%
261 testsBrake drum or shoe worn or contaminated explained
7.Exhaust system leaking or insecure10.4%
239 testsExhaust leaking or insecure explained
8.Fluid leaking excessively and likely to harm the environment or to pose a safety risk to other road users8.6%
198 tests

What gets tested

The GS300 fleet

Average mileage recorded at test: 115,781
Fuel mix of tested cars: Petrol99.3%

Trim names grouped into this model (4)

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

GS300 S AUTO
GS300 SE AUTO
GS300 SE-L AUTO
GS300 SPORT AUTO

Check a specific Lexus GS300

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 GS300 compared with other cars?: We do not publish a comparison for the Lexus GS300, 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 71.7% across 2,298 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 GS300?: The item recorded most often is "A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning", which appears in 13.9% of failed Lexus GS300 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 GS300?: The most common advisory is "Tyre tread depth not in accordance with the requirements", noted on 22.8% of all Lexus GS300 tests. An advisory is not a failure: it flags something that will likely need attention before the next test.
What mileage does a Lexus GS300 usually have at its MOT?: The average odometer reading recorded at test is 115,781 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.

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.