5,027 tests in 2025
Daihatsu Sirion reliability and MOT pass rate
67.6% passed first time. The 32.4% fail rate is 9.8 points worse than the all-car average, on a median example 18 years old with 70,762 miles.
Pass rate
67.6%
22.6% of all cars failed; 32.4% of these did.
Fixed on the day
7.5%
Passed after a defect was put right during the visit.
Median at test
70,762 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 | 0 | — |
| 14+ years | 5,027 | 32.4% |
What the Sirion 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.
- Suspension67 dangerous55.1%
- Lamps, reflectors and electrical equipment10 dangerous33.8%
- Brakes149 dangerous27.1%
- Body, chassis, structure20 dangerous20.5%
- Tyres276 dangerous15.9%
- Visibility15.1%
- Noise, emissions and leaks14.8%
- Steering9 dangerous13.9%
Is the Sirion getting worse?
The fail rate rose 3.9 points to 32.4% 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 | 7,421 | 15 | 28.5% | 22.5% | |
| 2023 | 6,888 | 16 | 29.4% | 22.8% | |
| 2024 | 5,306 | 17 | 33.4% | 23.2% | |
| 2025 | 5,027 | 18 | 32.4% | 22.6% |
Fail rate is first attempts at class 4 tests. Median age is the age of a typical Sirion 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 Sirion in 2025, counted by how many tests each one appeared on.
- 1Ball joint: ball joint excessively worn475 tests
- 2Wipers: does not clear the windscreen effectively167 tests
- 3Headlamp aim: projected beam image is obviously incorrect163 tests
- 4Component mounting prescribed areas: prescribed area excessively corroded significantly reducing structural strength157 tests
- 5Linkage ball joints: ball joint excessively worn146 tests
- 6Stop lamp: not working129 tests
- 7Rigid brake pipes: excessively corroded117 tests
- 8Position lamp: not working117 tests
What wears out first
Advisories are the tester flagging wear that is still legal. A typical Sirion collects 3.37 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.
- 1Rigid brake pipes: excessively corroded853 tests
- 2Condition: has a tear, caused by separation or partial failure of its structure648 tests
- 3Tread depth: tread depth below requirements of 1.6mm638 tests
- 4Ball joint: ball joint excessively worn448 tests
- 5Pins and bushes: pin or bush excessively worn430 tests
- 6Brake discs: in such a condition that it is seriously weakened399 tests
- 7Linkage ball joints: ball joint excessively worn343 tests
- 8Brake pads: less than 1.5 mm thick328 tests
Questions
What is the Daihatsu Sirion MOT pass rate?
67.6% of the 5,027 Daihatsu Sirion first-attempt MOTs in 2025 passed. The fail rate of 32.4% compares with 22.6% across all cars. A further 7.5% passed after a defect was fixed during the test visit.
What does a Daihatsu Sirion usually fail on?
The single most common failure is "Ball joint: ball joint excessively worn", recorded on 475 failed tests, followed by "Wipers: does not clear the windscreen effectively" and "Headlamp aim: projected beam image is obviously incorrect". By section, suspension appears in 55.1% of failures, lamps, reflectors and electrical equipment appears in 33.8% of failures, brakes appears in 27.1% 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 32.4%. The median Daihatsu Sirion tested in 2025 was 18 years old with 70,762 miles.
Is the Daihatsu Sirion getting less reliable?
The fail rate rose 3.9 points to 32.4% 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 Sirion 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 Daihatsu models
Checking a particular Sirion?
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.