At a glance
How 1,468 first tests went in 2025.
- Passed first time
- 77 in every 100
- Did not pass first time
- 23 in every 100333 failed first-attempt tests
- The typical car
- 8 yearsabout 58,256 miles
- First tests counted
- 1,468
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 Alfa Romeo Giulietta 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
One fault: side repeater indicators, 6.3 times as often as on similar cars.
Figures below are measured across the 333 failed first attempts in 2025 that had a mileage recorded, which allows a like-for-like comparison.
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.
Data: UK MOT open data, 2025. Compared with cars of the same age and mileage.
Suspension
One fault: suspension arm pins and bushes (front), 2.2 times as often as on similar cars.
Suspension arm pins and bushes (front)
What it means
Pins and bushes on suspension arms fail as Major when they are excessively worn. They are graded Dangerous when likely to become detached. DVSA uses the same wording for a suspension joint.
Also noted as an advisory
Testers also noted it as an advisory, worn but not yet failing, on 45 first tests, 2.4 times as often as on similar cars.
Data: UK MOT open data, 2025. Compared with cars of the same age and mileage. Advisories count notes recorded on failed first tests only.
Visibility
One fault: windscreen washers (front), 2.0 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
- 77in 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
- 19in every 100
- Did not pass, and were not fixed at the test station.
First-attempt pass 77.3% of 1,468 first tests (2025): only cars that passed first time count. Official-style pass 81.3%: cars fixed at the test station also count as a pass. The 4 fixed and the 19 not fixed make the 23 in every 100 that did not pass first time.
Petrol and diesel
Figures are in every 100 first tests.
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, 81 in every 100 passed first time.
| Year | Passed first time | First tests |
|---|---|---|
| 2010 | 55 in every 100 | 1,414 |
| 2011 | 55 in every 100 | 4,291 |
| 2012 | 58 in every 100 | 2,978 |
| 2013 | 63 in every 100 | 2,819 |
| 2014 | 66 in every 100 | 2,942 |
| 2015 | 69 in every 100 | 2,872 |
| 2016 | 74 in every 100 | 2,676 |
| 2017 This car | 77 in every 100 | 1,468 |
| 2018 | 79 in every 100 | 804 |
| 2019 | 80 in every 100 | 496 |
| 2020 | 82 in every 100 | 501 |
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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