At a glance
How 6,077 first tests went in 2025.
- Passed first time
- 82 in every 100
- Did not pass first time
- 18 in every 1001,098 failed first-attempt tests
- The typical car
- 12 yearsabout 74,833 miles
- First tests counted
- 6,077
What failed most often
- Tyre condition (front)11 in every 100 failed tests
- Tyre tread depth (front)8 in every 100 failed tests
- Coil spring (front)6 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 2013 Audi TT vehicles in 2025, not a prediction that any one car will have them. Faults are grouped by part of the car. A wear pattern follows age and use more than the way the car was built. They come from MOT defect codes, not manufacturer bulletins, recalls or a diagnosis of any one car.
Suspension
Two faults. The strongest is the suspension arm (rear): 13 times as often as on similar cars.
Figures below are measured across the 1,097 of 1,098 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.
Suspension arm (rear)
What it means
A missing bump stop rubber is not a reason to fail a suspension arm. A component that is fractured, missing or likely to fail is graded Dangerous, and one excessively damaged or corroded is Major. On some vehicles, some highly stressed parts are thin pressed steel, and many of those have hollow box sections or up-facing areas that can collect road dirt and salt, so they get special attention.
Also noted as an advisory
Testers also noted it as an advisory, worn but not yet failing, on 109 first tests, 7.1 times as often as on similar cars.
Shock absorbers (rear)
What it means
Slight seepage that leaves a film of fluid on a shock absorber does not fail it. Severe leakage, or damage so that it does not function, is Major. A shock absorber missing or likely to become detached is graded Dangerous, though a missing one is only rejected if shock absorbers were fitted as standard.
Data: UK MOT open data, 2025. Compared with cars of the same age and mileage. Advisories count notes recorded on failed first tests only.
Lamps and electrical
Two faults. The strongest is the rear fog light: 3.0 times as often as on similar cars.
Rear fog light
What it means
A missing obligatory rear fog lamp, one that is not working, or one that does not emit a steady red light is graded Major. A rear fog lamp adversely affected by the operation of any other lamp is Major too. The manual allows it to go out when main beam is switched on or when dipped beam headlamps are switched off.
Individual sidelight or tail light (rear)
What it means
A position lamp showing red light to the front or white light to the rear is Major. Rear lamps must show a steady red light, and front ones can show white, predominantly white with a blue tinge, or yellow if combined in a yellow headlamp. With a multiple light source, up to half not working is Minor and more than half is Major.
Data: UK MOT open data, 2025. Compared with cars of the same age and mileage.
Tyres
One wear pattern: tyre tread depth (rear), 2.9 times as often as on similar cars.
Tyre tread depth (rear)
What it means
Only primary grooves count when tread depth is assessed: those holding the wear indicators, or cut as deep as those when new. Shallower secondary grooves are ignored. Tread depth below the minimum for the vehicle is Dangerous, and so is a pattern not visible over the whole tread, but that second row applies only to vehicles that need the lower minimum.
Data: UK MOT open data, 2025. Compared with cars of the same age and mileage.
Seat belts and restraints
One fault: airbag warning light, 2.2 times as often as on similar cars.
Airbag warning light
What it means
The airbag warning lamp (SRS MIL in DVSA's wording) is failed only if it indicates a system malfunction, which is Major. A lamp lit to show the passenger airbag is disabled is not to be regarded as a defect. Dashboard messages are not a defect in their own right, though they can help the tester confirm a malfunction.
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
- 82in every 100
- Passed on the first test.
- Fixed at the station
- 3in 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 81.9% of 6,077 first tests (2025): only cars that passed first time count. Official-style pass 84.9%: cars fixed at the test station also count as a pass. The 3 fixed and the 15 not fixed make the 18 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.
| Year | Passed first time | First tests |
|---|---|---|
| 2000 | 61 in every 100 | 1,374 |
| 2001 | 60 in every 100 | 2,149 |
| 2002 | 60 in every 100 | 3,272 |
| 2003 | 60 in every 100 | 3,830 |
| 2004 | 61 in every 100 | 3,905 |
| 2005 | 61 in every 100 | 3,106 |
| 2006 | 60 in every 100 | 2,550 |
| 2007 | 65 in every 100 | 7,101 |
| 2008 | 68 in every 100 | 6,518 |
| 2009 | 71 in every 100 | 5,533 |
| 2010 | 71 in every 100 | 6,044 |
| 2011 | 75 in every 100 | 6,029 |
| 2012 | 81 in every 100 | 5,350 |
| 2013 This car | 82 in every 100 | 6,077 |
| 2014 | 81 in every 100 | 3,781 |
| 2015 | 85 in every 100 | 8,229 |
| 2016 | 87 in every 100 | 8,819 |
| 2017 | 88 in every 100 | 7,149 |
| 2018 | 89 in every 100 | 3,934 |
| 2019 | 91 in every 100 | 4,450 |
| 2020 | 92 in every 100 | 2,875 |
| 2021 | 92 in every 100 | 2,357 |
| 2022 | 92 in every 100 | 2,500 |
If you are buying one
What this year's MOT record means for the decision in front of you.
Mileage matters most on a 2013 Audi TT.
Of 2013 Audi TT vehicles with under 52,000 miles, 87 in every 100 passed their 2025 MOT first time. With 100,000 miles or more, 76 in every 100 did.
Petrol or diesel?
| Typical mileage | Passed first time, as tested | Passed first time, same mileage | |
|---|---|---|---|
| Petrol | 68,608 miles | 83 | 83 |
| Diesel | 87,737 miles | 80 | 81 |
Figures are in every 100 first tests. Petrol cars look better on the raw figures only because diesel cars have done more miles (typically 87,737 against 68,608). 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 52,000 | 68,000–82,000 | 100,000 and over | |
|---|---|---|---|
| Tyre condition (front) | 1.2 | 2.0 | 3.0 |
| Tyre tread depth (front) | 0.3 | 1.3 | 2.2 |
| Coil spring (front) | 0.7 | 0.9 | 2.1 |
| Windscreen washers | 0.2 | 1.0 | 1.6 |
| Shock absorbers (rear) | 0.5 | 0.8 | 1.5 |
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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