How reliable is the Daihatsu Sirion compared with other cars?

We do not publish a comparison for the Daihatsu Sirion, because the cars of this model that have been tested do not cover a wide enough range of ages and mileages.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 60.4% across 5,416 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 Daihatsu Sirion?

The item recorded most often is "A suspension pin, bush or joint excessively worn", which appears in 30.7% of failed Daihatsu Sirion 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 Daihatsu Sirion?

The most common advisory is "Brake pipe damaged or excessively corroded", noted on 23.9% of all Daihatsu Sirion tests. An advisory is not a failure: it flags something that will likely need attention before the next test.

What mileage does a Daihatsu Sirion usually have at its MOT?

The average odometer reading recorded at test is 73,721 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

Daihatsu Sirion MOT pass rate & common failures

From 5,416 recorded MOT tests of the Daihatsu Sirion, published by DVSA.

Data updated 29 July 2026

Quick answer

Across 5,416 MOT tests, 60.4% of Daihatsu Sirion tests ended in a pass. This figure is not adjusted for age or mileage, so it is not a reliability ranking: the Daihatsu Sirion 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 suspension pin, bush or joint excessively worn, which appears in 30.7% of failed tests. Cars of this model average 73,721 miles on the odometer when tested.

At a glance

Recorded pass rate

60.4%unadjusted, not comparable5,416 tests

We are not publishing a ranking for the Sirion. 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 5,416 tests and are worth reading on their own terms.

DVSA recorded wording

Most common failure items

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

1.A suspension pin, bush or joint excessively worn30.7%
535 occurrencesSuspension arm bush worn explained
2.The aim of a headlamp is not within limits laid down in the requirements14.4%
252 occurrencesHeadlamp aim incorrect explained
3.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 repaired13.9%
242 occurrencesSuspension mounting corroded or insecure explained
4.Wiper blade missing or obviously not clearing the windscreen13.1%
229 occurrencesWiper or washer not working properly explained
5.A suspension pin, bush or joint excessively worn11.5%
200 occurrencesSuspension arm bush worn explained
6.Brake pipe damaged or excessively corroded10.1%
176 occurrencesBrake pipe corroded explained
7.A lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning8.3%
144 occurrencesLamp not working explained
8.Stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning8.0%
140 occurrencesStop lamp not working explained
9.Tyre tread depth not in accordance with the requirements7.3%
127 occurrencesTyre worn close to the legal limit explained
10.Steering rack gaiter or ball joint dust cover missing or no longer prevents the ingress of dirt etc7.0%
123 occurrencesSteering rack gaiter split, damaged or missing explained

Warnings without a failure

Most common advisories

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

1.Brake pipe damaged or excessively corroded23.9%
1,294 testsBrake pipe corroded explained
2.A tyre seriously damaged19.6%
1,062 testsTyre damaged or deteriorated explained
3.Tyre tread depth not in accordance with the requirements18.1%
979 testsTyre worn close to the legal limit explained
4.Brake disc or drum excessively weakened, insecure or fractured9.6%
520 testsBrake disc worn, pitted or scored explained
5.Product on the lens or light source which obviously reduces light intensity or changes emitted colour to other than white or yellow8.9%
484 testsLamp of the wrong colour, position or intensity explained
6.A suspension pin, bush or joint excessively worn8.5%
462 testsSuspension arm bush worn explained
7.A suspension component excessively damaged or corroded8.4%
456 testsSuspension mounting corroded or insecure explained
8.A suspension pin, bush or joint excessively worn8.2%
446 testsSuspension arm bush worn explained

What gets tested

The Sirion fleet

Average mileage recorded at test: 73,721
Fuel mix of tested cars: Petrol100.0%

Check a specific Daihatsu Sirion

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

Compare within the range

Other Daihatsu models

Daihatsu Terios — 58.6% unadjusted
Daihatsu Copen — 68.3% unadjusted
Daihatsu Fourtrak — 66.6% unadjusted
Daihatsu Charade — 58.2% unadjusted
Daihatsu Hijet — 62.6% unadjusted
Daihatsu Materia — 64.6% unadjusted
All Daihatsu models

Common questions

How reliable is the Daihatsu Sirion compared with other cars?: We do not publish a comparison for the Daihatsu Sirion, 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 60.4% across 5,416 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 Daihatsu Sirion?: The item recorded most often is "A suspension pin, bush or joint excessively worn", which appears in 30.7% of failed Daihatsu Sirion 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 Daihatsu Sirion?: The most common advisory is "Brake pipe damaged or excessively corroded", noted on 23.9% of all Daihatsu Sirion tests. An advisory is not a failure: it flags something that will likely need attention before the next test.
What mileage does a Daihatsu Sirion usually have at its MOT?: The average odometer reading recorded at test is 73,721 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.