6,449 tests in 2025
Lexus Rx400h reliability and MOT pass rate
76.7% passed first time. The 23.3% fail rate is 0.7 points worse than the all-car average, on a median example 18 years old with 137,118 miles.
Pass rate
76.7%
22.6% of all cars failed; 23.3% of these did.
Fixed on the day
7.8%
Passed after a defect was put right during the visit.
Median at test
137,118 mi
18 years old.
Fail rate by age
| Age at test | Tests | Fail rate |
|---|---|---|
| 3-5 years | 0 | — |
| 6-9 years | 0 | — |
| 10-13 years | 1 | — |
| 14+ years | 6,448 | 23.3% |
What the Rx400h 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.
- Suspension44 dangerous46.4%
- Lamps, reflectors and electrical equipment2 dangerous39.9%
- Brakes249 dangerous35%
- Tyres318 dangerous20.7%
- Body, chassis, structure13 dangerous16%
- Visibility11.8%
- Noise, emissions and leaks4.4%
- Identification of the vehicle3.8%
Is the Rx400h getting worse?
The fail rate rose 3.6 points to 23.3% from 2022 to 2025 while the median one tested aged 3 years. Ageing alone would predict about 1.4 points, so it is getting worse faster than age explains.
| Year | Tests | Median age | Fail rate | All cars | |
|---|---|---|---|---|---|
| 2022 | 7,981 | 15 | 19.7% | 22.5% | |
| 2023 | 7,754 | 16 | 20.7% | 22.8% | |
| 2024 | 6,725 | 17 | 22.8% | 23.2% | |
| 2025 | 6,447 | 18 | 23.3% | 22.6% |
Fail rate is first attempts at class 4 tests. Median age is the age of a typical Rx400h 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 Rx400h in 2025, counted by how many tests each one appeared on.
- 1Position lamp: not working292 tests
- 2Pins and bushes: pin or bush excessively worn149 tests
- 3Linkage ball joint dust cover: ball joint dust cover no longer prevents the ingress of dirt143 tests
- 4Ball joint dust cover: ball joint dust cover no longer prevents the ingress of dirt135 tests
- 5Component mounting prescribed areas: prescribed area excessively corroded significantly reducing structural strength117 tests
- 6Tread depth: tread depth below requirements of 1.6mm117 tests
- 7Rbt (sp): efficiency below requirements116 tests
- 8Shock absorbers: has a serious fluid leak113 tests
What wears out first
Advisories are the tester flagging wear that is still legal. A typical Rx400h collects 3.43 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.
- 1Pins and bushes: pin or bush excessively worn1,823 tests
- 2Tread depth: tread depth below requirements of 1.6mm1,120 tests
- 3Brake discs: in such a condition that it is seriously weakened1,075 tests
- 4Sub-frame: corroded and seriously weakened618 tests
- 5Condition: has a tear, caused by separation or partial failure of its structure529 tests
- 6Shock absorbers: has a serious fluid leak496 tests
- 7Brake pads: less than 1.5 mm thick476 tests
- 8Registration plates: inscription illegible438 tests
Questions
What is the Lexus Rx400h MOT pass rate?
76.7% of the 6,449 Lexus Rx400h first-attempt MOTs in 2025 passed. The fail rate of 23.3% compares with 22.6% across all cars. A further 7.8% passed after a defect was fixed during the test visit.
What does a Lexus Rx400h usually fail on?
The single most common failure is "Position lamp: not working", recorded on 292 failed tests, followed by "Pins and bushes: pin or bush excessively worn" and "Linkage ball joint dust cover: ball joint dust cover no longer prevents the ingress of dirt". By section, suspension appears in 46.4% of failures, lamps, reflectors and electrical equipment appears in 39.9% of failures, brakes appears in 35% 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 23.3%. The median Lexus Rx400h tested in 2025 was 18 years old with 137,118 miles.
Is the Lexus Rx400h getting less reliable?
The fail rate rose 3.6 points to 23.3% from 2022 to 2025 while the median one tested aged 3 years. Ageing alone would predict about 1.4 points, so it is getting worse faster than age explains.
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 Rx400h trim together. Year-on-year figures come from the same DVSA extracts for 2026 and earlier years. Full method on the pass rates hub.
Other Lexus models
Checking a particular Rx400h?
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.