Daihatsu Sirion: MOT pass rate and reliability data

The Daihatsu Sirion fails its first MOT more often than the average UK car, by 9.9 percentage points. These figures come from the DVSA's full year of anonymised MOT results, covering 6,196 individual Daihatsu Sirion tests. Nothing here is an estimate or a survey.

The numbers

What this means if you are buying one

A 66.8% first-time pass rate means roughly 33 in every 100 Daihatsu Sirions presented for MOT fail on the first attempt. That is worse than average, so budget for remedial work and treat a fresh 12-month MOT as a genuine selling point rather than a given. The average Daihatsu Sirion tested had covered 71,843 miles and was built around 2007.

What this means at salvage auction

Pass rate is a proxy for what a car costs to keep on the road. The Daihatsu Sirion sits 9.9 points below the national average, ranked 1,832 of 2,005 models. On one bought as repairable salvage, assume the mechanical side needs more than the visible accident damage, and pad your repair estimate accordingly.

Before you bid: run the lot through the analyzer, check the car's own record, check the mileage, decode the VIN, and if it carries a marker use the write-off value calculator. Or compare it against another model.

Looking at a specific Daihatsu Sirion rather than the model in general? The free check covers its MOT and mileage history, and the full HPI report confirms the insurance write-off category, outstanding finance and whether it is recorded stolen, from licensed data for 5 credits. Already own one that has been damaged? Work out whether fixing it beats selling it with the repair or scrap calculator, and see recorded closing bids for damaged Daihatsu Sirions at UK salvage auction.

Most common MOT failures on a Daihatsu Sirion

1. 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 repaired, 5.9% of tests (6.21x the national rate for this defect)
2. Vehicle structure corroded to the extent that the rigidity of the assembly is seriously reduced, 1.8% of tests (4.34x the national rate for this defect)
3. Brake pipe damaged or excessively corroded, 4.1% of tests (3.87x the national rate for this defect)
4. Lambda coefficient outside the default limits or the range specified by the manufacturer, 1.8% of tests (3.48x the national rate for this defect)
5. A suspension pin, bush or joint excessively worn, 16.5% of tests (3.28x the national rate for this defect)
6. Steering rack gaiter or ball joint dust cover missing or no longer prevents the ingress of dirt etc, 2.2% of tests (3.02x the national rate for this defect)
7. Exhaust system leaking or insecure, 2.7% of tests (2.68x the national rate for this defect)
8. Wiper blade missing or obviously not clearing the windscreen, 3.8% of tests (2.02x the national rate for this defect)
9. The aim of a headlamp is not within limits laid down in the requirements, 4.3% of tests (1.81x the national rate for this defect)
10. Stop lamp missing, inoperative or in the case of a multiple light source more than 1/2 not functioning, 2.3% of tests (1.66x the national rate for this defect)

From 6,188 DVSA-tracked Daihatsu Sirion tests, 2024. DVSA testers marked 3.24% of these flagged Daihatsu Sirion defects as "dangerous", meaning the tester judged the car unsafe to drive away, against 5.11% nationally.

Most common MOT advisories on a Daihatsu Sirion

An advisory doesn't fail the car - the tester flags it as worth watching, but it still passes. A different list from the failures above: what testers are noting on a Daihatsu Sirion before it actually fails on it.

1. A stub axle swivel pin and/or bush excessively worn, 5.9% of tests (9.28x the national rate for this advisory)
2. Product on the lens or light source which obviously reduces light intensity or changes emitted colour to other than white or yellow, 8% of tests (7.27x the national rate for this advisory)
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 repaired, 8% of tests (5.27x the national rate for this advisory), also fails
4. Vehicle structure corroded to the extent that the rigidity of the assembly is seriously reduced, 5.2% of tests (4.21x the national rate for this advisory), also fails
5. A suspension component excessively damaged or corroded, 19% of tests (3.67x the national rate for this advisory)
6. Brake pipe damaged or excessively corroded, 22.5% of tests (3.63x the national rate for this advisory), also fails
7. A suspension pin, bush or joint excessively worn, 30.5% of tests (2.28x the national rate for this advisory), also fails
8. Exhaust system leaking or insecure, 5.9% of tests (2.07x the national rate for this advisory), also fails
9. Number plate inscription missing or illegible, 5.3% of tests (1.98x the national rate for this advisory)
10. A spring or spring component fractured or seriously weakened, 6.2% of tests (1.32x the national rate for this advisory)

From 6,188 DVSA-tracked Daihatsu Sirion tests, 2024.

Daihatsu Sirion pass rate by model year

From its 2005 to its 2009 model year, the Daihatsu Sirion's first-time pass rate has risen 6.6 points, from 64.7% to 71.3%, the usual pattern: a newer model year is a younger car today, so it fails less. First-time pass rate for each Daihatsu Sirion year:

• 2005 Daihatsu Sirion - 64.7% first-time pass, 719 tests
• 2006 Daihatsu Sirion - 65.4% first-time pass, 714 tests
• 2007 Daihatsu Sirion - 66.5% first-time pass, 1,348 tests
• 2008 Daihatsu Sirion - 68.1% first-time pass, 1,836 tests
• 2009 Daihatsu Sirion - 71.3% first-time pass, 900 tests

Other Daihatsu models

• Daihatsu Terios - 64.3%
• Daihatsu Fourtrak - 65.8%
• Daihatsu Copen - 73.6%
• Daihatsu Charade - 64.7%
• Daihatsu Hijet - 63.3%
• Daihatsu Materia - 73%

Models with a similar pass rate

• Volkswagen Camper - 67%
• Hyundai Sonata - 67%
• Alfa Romeo Mito - 66.8%
• Ssangyong Rodius - 66.8%
• Mazda Demio - 66.8%
• SEAT Arosa - 66.7%

If this car is a salvage or write-off

• What does Cat N mean? Category N explained
• What does Cat S mean? Category S explained
• Cat S vs Cat N: the real differences
• Do you need an HPI check on a car you know is a write-off?

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All 2,005 models ranked by MOT pass rate