At a glance
How 1,609 first tests went in 2025.
- Passed first time
- 83 in every 100
- Did not pass first time
- 17 in every 100268 failed first-attempt tests
- The typical car
- 12 yearsabout 92,113 miles
- First tests counted
- 1,609
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 Lexus IS 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.
Tyres
Two wear patterns. The strongest is the tyre pressure monitoring system: 17 times as often as on similar cars.
Figures below are measured across the 267 of 268 failed first attempts (99.6%) 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.
Tyre pressure monitoring system
What it means
A tyre pressure monitoring system that is obviously inoperative is graded Major, and so is one listed as malfunctioning or obviously inoperative. The Minor row uses the word malfunctioning too, but its detail is a warning lamp indicating a fault, and it also covers a tyre that is obviously under-inflated.
Tyre condition (rear)
What it means
Exposed or damaged ply or cords are graded Dangerous. A cut in excess of the requirements and deep enough to reach the ply or cords is Major, and testers may open the cut with a blunt instrument to check its depth. A tyre contacting the vehicle through flexing or suspension movement is not a defect; fouling fails only at the time of test.
Data: UK MOT open data, 2025. Compared with cars of the same age and mileage.
Visibility
One fault: windscreen wipers (front), 2.9 times as often as on similar cars.
Windscreen wipers (front)
Data: UK MOT open data, 2025. Compared with cars of the same age and mileage.
Lamps and electrical
One fault: headlight (front), 2.6 times as often as on similar cars.
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.
MOT pass rates
How first tests ended, and how the pass rates are counted.
- Passed first time
- 83in 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
- 14in every 100
- Did not pass, and were not fixed at the test station.
First-attempt pass 83.3% of 1,609 first tests (2025): only cars that passed first time count. Official-style pass 86.1%: cars fixed at the test station also count as a pass. The 3 fixed and the 14 not fixed make the 17 in every 100 that did not pass first time.
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, 84 in every 100 passed first time.
| Year | Passed first time | First tests |
|---|---|---|
| 2000 | 65 in every 100 | 305 |
| 2001 | 71 in every 100 | 613 |
| 2002 | 66 in every 100 | 864 |
| 2003 | 66 in every 100 | 1,069 |
| 2004 | 65 in every 100 | 1,218 |
| 2005 | 66 in every 100 | 1,295 |
| 2006 | 69 in every 100 | 2,272 |
| 2007 | 70 in every 100 | 2,839 |
| 2008 | 74 in every 100 | 2,328 |
| 2009 | 73 in every 100 | 2,138 |
| 2010 | 75 in every 100 | 2,076 |
| 2011 | 78 in every 100 | 1,397 |
| 2012 | 82 in every 100 | 855 |
| 2013 This car | 83 in every 100 | 1,609 |
| 2014 | 85 in every 100 | 2,925 |
| 2015 | 86 in every 100 | 2,603 |
| 2016 | 85 in every 100 | 1,827 |
| 2017 | 90 in every 100 | 1,457 |
| 2018 | 91 in every 100 | 1,338 |
| 2019 | 89 in every 100 | 1,075 |
| 2020 | 92 in every 100 | 516 |
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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