At a glance
How 7,787 first tests went in 2025.
- Passed first time
- 81 in every 100
- Did not pass first time
- 19 in every 1001,468 failed first-attempt tests
- The typical car
- 8 yearsabout 51,428 miles
- First tests counted
- 7,787
What failed most often
- Tyre condition (front)13 in every 100 failed tests
- Brake pads (front)8 in every 100 failed tests
- Windscreen washers8 in every 100 failed tests
How we count this. Data: UK MOT open data, 2025. Only Class 4 cars on their first MOT of the year are counted. A car that fails and is fixed at the test station still counts as a fail in the first-attempt rate. These are raw results, not adjusted for age, mileage, or peer mix. The MOT does not test engine or gearbox internals.
These are patterns across 2017 Kia Rio vehicles in 2025, not a prediction that any one car will have them. Faults are grouped by part of the car. They come from MOT defect codes, not manufacturer bulletins, recalls or a diagnosis of any one car.
Lamps and electrical
Two faults. The strongest is the side repeater indicators: 2.6 times as often as on similar cars.
Figures below are measured across the 1,467 of 1,468 failed first attempts (99.9%) that recorded an odometer reading in 2025. Mileage is needed to compare like with like.
We only list faults with at least 20 failures and a rate of about 2.0 times that of similar cars, which keeps one-off results out of the list.
Side repeater indicators
What it means
Sequential or dynamic direction indicators are not a reason to fail. Where a side repeater is required, it is allowed to be part of the front direction indicator if it has a marked wraparound lens, or an amber light coming through the front lens when viewed from a set distance to the side of the rear bumper. A lens defect with no effect on the emitted light is Minor, and one that adversely affects the light is Major.
Headlight (front)
What it means
On vehicles first used on or after a set date, a halogen headlamp unit converted to take HID or LED bulbs fails for light source and lamp not compatible, which is Major. A complete unit built with those light sources is not failed for that. The precise position of the lamps is not part of the inspection beyond a visual look to see that they sit at about the same height and distance from each side.
Data: UK MOT open data, 2025. Compared with cars of the same age and mileage.
Visibility
One fault: windscreen washers (front), 2.2 times as often as on similar cars.
Windscreen washers (front)
What it means
Windscreen washers that are not working, or do not provide sufficient fluid to clear the windscreen, are graded Major. They must provide enough fluid for the wipers to clear the windscreen effectively. Vehicles with an opening windscreen, or some other adequate view to the front, left and right, are not inspected for washers.
Data: UK MOT open data, 2025. Compared with cars of the same age and mileage.
MOT pass rates
How first tests ended, and how the pass rates are counted.
- Passed first time
- 81in every 100
- Passed on the first test.
- Fixed at the station
- 4in every 100
- Failed, then fixed at the test station the same day.
- Failed
- 15in every 100
- Did not pass, and were not fixed at the test station.
First-attempt pass 81.1% of 7,787 first tests (2025): only cars that passed first time count. Official-style pass 85.0%: cars fixed at the test station also count as a pass. The 4 fixed and the 15 not fixed make the 19 in every 100 that did not pass first time.
Petrol and diesel
Figures are in every 100 first tests. Cars with more miles usually fail more often, so the same-mileage figure gives every fuel the mileage mix of all the cars in this year.
Same model, other years
Passed first time in every 100, all tested in 2025.
Newer cars are younger, so look for a jump rather than the climb. A year earlier (2024), when these cars were a year younger, 82 in every 100 passed first time.
| Year | Passed first time | First tests |
|---|---|---|
| 2005 | 48 in every 100 | 347 |
| 2006 | 51 in every 100 | 697 |
| 2007 | 54 in every 100 | 889 |
| 2008 | 51 in every 100 | 1,598 |
| 2009 | 54 in every 100 | 4,030 |
| 2010 | 55 in every 100 | 5,250 |
| 2011 | 54 in every 100 | 6,114 |
| 2012 | 59 in every 100 | 8,171 |
| 2013 | 61 in every 100 | 9,193 |
| 2014 | 66 in every 100 | 10,368 |
| 2015 | 74 in every 100 | 10,904 |
| 2016 | 76 in every 100 | 8,528 |
| 2017 This car | 81 in every 100 | 7,787 |
| 2018 | 85 in every 100 | 5,571 |
| 2019 | 84 in every 100 | 4,705 |
| 2020 | 85 in every 100 | 3,285 |
| 2021 | 87 in every 100 | 3,559 |
| 2022 | 91 in every 100 | 4,410 |
If you are buying one
What this year's MOT record means for the decision in front of you.
Mileage matters most on a 2017 Kia Rio.
Of 2017 Kia Rio vehicles with under 34,000 miles, 88 in every 100 passed their 2025 MOT first time. With 74,000 miles or more, 72 in every 100 did.
Petrol or diesel?
| Typical mileage | Passed first time, as tested | Passed first time, same mileage | |
|---|---|---|---|
| Petrol | 48,571 miles | 82 | 81 |
| Diesel | 67,592 miles | 77 | 79 |
Figures are in every 100 first tests. Petrol cars look better on the raw figures only because diesel cars have done more miles (typically 67,592 against 48,571). At the same mileage there is no clear difference between the two.
What to check at your mileage
How often each fault turned up on a failed first test, by the car's mileage. Read it as: what is likely to need looking at on a car like the one in front of you.
| Under 34,000 | 46,000–58,000 | 74,000 and over | |
|---|---|---|---|
| Tyre condition (front) | 1.6 | 1.7 | 3.6 |
| Brake pads (front) | 1.1 | 1.9 | 1.5 |
| Windscreen washers | 1.0 | 1.7 | 2.1 |
| Tyre tread depth (front) | 0.4 | 1.5 | 1.9 |
| Headlight (front) | 0.0 | 0.9 | 2.8 |
Faults per 100 first tests, by the car's mileage at the test.
When a car fails
of failed cars had one item to fix.
of failed cars had three or more items to fix.
of all first tests had a defect the tester marked dangerous (unsafe to drive away).
Every figure here is a first-attempt MOT rate from DVSA open data for this model line, for cars of this model year tested in 2025. Each mileage band holds a fifth of the tests. MOTs do not test engine or gearbox internals, so this is a pre-purchase checklist, not a full reliability score.
FAQs
Short answers about how to read this model-year guide.
About this data
How this page is built and what it can (and can't) say.
These figures come from UK MOT open data for this model year. We surface common failure patterns against similar cars, not a full reliability score, and not a pass/fail verdict on any individual vehicle.
What we include
UK Class 4 cars only. Normal MOT tests (not retests); first test per vehicle per calendar year; results pass, PRS, or fail.
Same-day repairs
PRS means the car failed items that were fixed at the test station and then passed the same day. We count PRS as a first-attempt fail in headline rates so same-day repairs do not hide problems.
How we compare
We compare this model year with other Class 4 cars of similar age and mileage in the same test year. This model family is left out of the peer group so the car is not measured against itself.
What this does not cover
- MOTs do not cover engine internals, gearboxes, or many electronics; this is not a full reliability score.
- Common faults come from MOT defect stats, not manufacturer TSBs or recalls.
- Age and mileage matching reduces, but does not remove, differences in how cars were used and maintained.
- If the data for a car is too thin to say anything useful, we say so rather than guess.
Contains public sector information licensed under the Open Government Licence v3.0.
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