2025 MOT results
Daihatsu Sirion common problems
The most common reason a Daihatsu Sirion fails its MOT is a worn steering or suspension joint, on 21.2% of its 2,147 failed tests in 2025. Against other cars of the same age, 5 faults stand out, the widest gaps being: a steering fault at 4.8% of failures against 1.2% expected; a worn steering or suspension joint at 21.2% of failures against 5.7% expected; wiper blades that do not clear the screen at 11.9% of failures against 5.9% expected.
- Tests in 2025 5,416 Cars aged three and over
- Failed first time 39.6% 2,147 tests
- Found a dangerous defect 8.1% Unsafe to drive away
- Ended with an advisory 70.3% A problem to watch, not a failure
What fails a Daihatsu Sirion MOT
Each bar is the share of failed Daihatsu Sirion tests with that defect. Where we can compare it with cars of the same registration years, the marker shows what an average car of those ages records (12 of the 12 items below).
Most common reasons for failure
A test can fail for more than one defect, so shares add up to more than 100%.
| Defect | Share of failed tests |
|---|---|
| Suspension arms: ball joint excessively worn Suspension | 21.2% |
| Wipers: does not clear the windscreen effectively Visibility | 11.9% |
| Stop lamp: not working Lamps, reflectors and electrical equipment | 10.1% |
| Headlamp aim: projected beam image is obviously incorrect Lamps, reflectors and electrical equipment | 9.5% |
| Position lamp: not working Lamps, reflectors and electrical equipment | 9.2% |
| Component mounting prescribed area excessively corroded significantly reducing structural strength Suspension | 7.9% |
| Linkage ball joint excessively worn Suspension | 7.4% |
| Rigid brake pipes: excessively corroded Brakes | 5.7% |
| Exhaust system: major leak of exhaust gases Body, chassis, structure | 5.3% |
| Tyres: tread depth below requirements of 1.6mm Tyres | 5.0% |
| Headlamp: not working on dipped beam Lamps, reflectors and electrical equipment | 4.8% |
| Steering rack: gaiter missing or no longer prevents the ingress of dirt Steering | 4.8% |
Source:DVSA,UK Motoring analysis 2025 Updated
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Worn steering or suspension joint
21.2% of failures 5.7% expected 3.7 times as often
Play in a steering or suspension joint, where a worn ball and socket lets the wheel move where it should not.
A knock at low speed over rough ground, or vague steering, is the usual warning.
-
Wiper blades that do not clear the screen
11.9% of failures 5.9% expected 2 times as often
Wiper blades that leave the windscreen smeared or streaked across the area the driver looks through.
Look for split or hardened rubber, and lift each blade to see whether it still sits flat.
-
Brake light out
10.1% of failures 9.4% expected about as expected
A brake light not working, from a bulb, a poor earth, or the switch on the pedal.
Reverse up to a wall or window at dusk and press the pedal to see all three lamps light.
-
Headlamp aim out of line
9.5% of failures 8.4% expected about as expected
The beam pattern points too high, too low, or in the wrong place, so it either dazzles others or lights too little road.
Nothing to do at the roadside, but a garage resets the aim in minutes; a sagging suspension corner or a heavy boot load can throw it out.
-
Sidelight out
9.2% of failures 13.7% expected somewhat less often
A sidelight, also called a position lamp, not working. It marks the width of the car at night.
Walk round the car with the lights on and the hazards going; these are the cheapest failures to avoid.
-
Structural corrosion
7.9% of failures 4.5% expected 1.8 times as often
Corrosion in a structural area near a suspension, steering or seat belt mounting, which is a serious failure.
Look at the inner sills, rear spring seats and subframe mounts on cars over about 12 years old.
Which parts of the car fail
Suspension is the area that most often fails a Daihatsu Sirion, on 45.1% of failed tests. That is also where it differs most from cars of the same registration years, which record 40.7%.
Failure categories
DVSA's own sections of the test. The marker is what cars of the same registration years record.
| Defect category | Share of failed tests |
|---|---|
| Suspension | 45.1% |
| Lamps, reflectors and electrical equipment | 40.8% |
| Brakes | 22.3% |
| Visibility | 18.6% |
| Body, chassis, structure | 17.5% |
| Tyres | 13.4% |
| Noise, emissions and leaks | 12.4% |
| Steering | 11.4% |
Source:DVSA,UK Motoring analysis 2025 Updated
What testers warn about
70.3% of Daihatsu Sirion tests ended with at least one advisory: a fault the tester found that did not fail the test. On Daihatsu Sirions, these are the items to ask about on a car you are viewing, because they are what the last tester expected to go next.
Most common advisories
Share of all tests, passes included.
| Advisory | Share of tests |
|---|---|
| Rigid brake pipes: corroded, covered in grease or other material Brakes | 17.0% |
| Tread depth: worn close to legal limit or worn on edge Tyres | 14.3% |
| Tyres: slightly damaged or cracking or perishing Tyres | 12.9% |
| Brake discs: worn, pitted or scored, but not seriously weakened Brakes | 8.0% |
| Suspension arms: ball joint has slight play Suspension | 7.5% |
| Linkage ball joint has slight play Suspension | 6.7% |
| Headlamp: product on the lens but not seriously reducing light output Lamps, reflectors and electrical equipment | 6.6% |
| Brake pads: wearing thin Brakes | 6.5% |
| Play in steering rack inner joint(s) Non-component advisories | 6.2% |
| Suspension arms: pin or bush worn but not resulting in excessive movement Suspension | 6.0% |
| Suspension arm: corroded but not seriously weakened Suspension | 5.6% |
| Registration plates: deteriorated but not likely to be misread Identification of the vehicle | 5.4% |
Source:DVSA,UK Motoring analysis 2025 Updated
Daihatsu Sirion problems: common questions
What is the most common problem with a Daihatsu Sirion?
Of the faults that fail an MOT, “Suspension arms: ball joint excessively worn” is the most common: it appears on 21.2% of failed Daihatsu Sirion tests. Across categories, suspension is the area that most often fails one, on 45.1% of failed tests.
How often does a Daihatsu Sirion fail its MOT?
39.6% of Daihatsu Sirion tests in 2025 were not passed first time, from 5,416 tests of cars aged three and over. Allowing for the age and mileage of the cars tested, that gives it a UK Motoring Reliability Score of 52 out of 100, where 50 is as expected.
Does anything fail more often on a Daihatsu Sirion than on other cars?
Yes. “Steering rack: gaiter missing or no longer prevents the ingress of dirt” appears on 4.8% of its failures against 1.2% for cars of the same age, and “Suspension arms: ball joint excessively worn” appears on 21.2% of its failures against 5.7% for cars of the same age. Where an item is missing from the national figures for a year, we use the smallest share those figures show, so the comparison never overstates the difference.
Are these the same as breakdowns or known faults?
No. These are the items a tester recorded at the MOT, which covers condition and safety: lamps, brakes, tyres, suspension, corrosion and emissions. A gearbox that is unpleasant, an infotainment screen that has died, or a car that will not start on a cold morning are not part of the test, so they are not in these figures.
Where do the figures come from?
Every normal MOT test of a Daihatsu Sirion aged three and over in Great Britain in 2025, from DVSA's anonymised MOT results. Retests are excluded, and the same fault on more than one wheel counts once.
Data stories to read next
Data sources and methodology
| Figures | Source | Period | Records | Updated |
|---|---|---|---|---|
| MOT defects and advisories | Anonymised MOT tests and results Driver and Vehicle Standards Agency Derived statistics UK Motoring | 2025 | 5,416 MOT tests | 19 September 2026 |
- Shares for defects are of failed tests; shares for advisories are of all tests. A test can carry several defects, so shares add to more than 100%.
- The expected share is what an average car of the same registration years records, weighted by where this model’s failures fall. Where an item is outside the national figures for a year, the smallest share those figures show is used in its place, which is an upper bound, so the comparison never overstates a model’s problems. No expectation is published where less than 80% of the model’s failures can be compared.
- Great Britain only: DVSA does not run MOT testing in Northern Ireland. Cars under three years old are not tested.
- The descriptions of what each part does are general and the same on every model. Every figure comes from the MOT data.
Contains public sector information licensed under the Open Government Licence v3.0.