At a glance
How 2,246 first tests went in 2025.
- Passed first time
- 74 in every 100
- Did not pass first time
- 26 in every 100585 failed first-attempt tests
- The typical car
- 7 yearsabout 51,202 miles
- First tests counted
- 2,246
What failed most often
- Tyre tread depth (front)15 in every 100 failed tests
- Daytime running lights (front)10 in every 100 failed tests
- Individual sidelight or tail light (front)9 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 2018 Jeep Compass 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.
Lamps and electrical
Two faults. The strongest is the daytime running lights (front): 15 times as often as on similar cars.
Figures below are measured across the 583 of 585 failed first attempts (99.7%) 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.
Daytime running lights (front)
What it means
Daytime running lamps are inspected only when fitted as original equipment to cars and similar passenger vehicles first used on or after a set date. A lamp that is missing or not working, or that shows red light to the front, is Major. These lamps need not operate when the engine is not running, the parking brake is on, or park is selected on an automatic.
Individual sidelight or tail light (front)
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.
Suspension
Two faults. The strongest is the suspension arm pins and bushes (rear): 10 times as often as on similar cars.
Suspension arm pins and bushes (rear)
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 66 first tests, 28 times as often as on similar cars.
Anti-roll bar linkage ball joints (front)
What it means
Excessive wear on an anti-roll bar linkage ball joint is Major. A joint likely to become detached is graded Dangerous.
Also noted as an advisory
Testers also noted it as an advisory, worn but not yet failing, on 20 first tests, 6.9 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.
Brakes
One wear pattern: brake discs (rear), 3.0 times as often as on similar cars.
Brake discs (rear)
What it means
A brake disc or drum must be significantly worn before it is rejected, and being worn below the manufacturer's recommended limits is not a reason in itself. Significantly and obviously worn is Major, as is contamination with oil or grease. A disc or drum that is fractured, insecure, seriously weakened or missing is graded Dangerous.
Data: UK MOT open data, 2025. Compared with cars of the same age and mileage.
Noise, emissions and leaks
One fault: diesel engine warning light, 2.6 times as often as on similar cars.
Diesel engine warning light
What it means
An engine malfunction indicator lamp that is illuminated to show a malfunction is graded Major on a diesel, but only on the diesels the test covers, which depends on the vehicle type and when it was first used. DVSA lists it under exhaust emissions for compression ignition engines, and the detail line for the row also names an inoperative lamp.
Data: UK MOT open data, 2025. Compared with cars of the same age and mileage.
Visibility
One fault: windscreen washers (front), 2.1 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.
Advisories
Other things testers noted as worn or close to failing, more often than on similar cars.
An advisory is a note from the tester about something that has not failed yet. It is an early warning, not a fail. Advisories for the faults above are shown with those faults.
Engine oil leaks
Non-component advisories
Data: UK MOT open data, 2025. Counts cover advisories recorded on failed first tests only, 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
- 74in 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
- 23in every 100
- Did not pass, and were not fixed at the test station.
First-attempt pass 74.0% of 2,246 first tests (2025): only cars that passed first time count. Official-style pass 77.4%: cars fixed at the test station also count as a pass. The 3 fixed and the 23 not fixed make the 26 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, 77 in every 100 passed first time.
| Year | Passed first time | First tests |
|---|---|---|
| 2018 This car | 74 in every 100 | 2,246 |
| 2019 | 77 in every 100 | 2,979 |
| 2020 | 83 in every 100 | 1,566 |
| 2021 | 84 in every 100 | 1,584 |
| 2022 | 85 in every 100 | 1,219 |
If you are buying one
What this year's MOT record means for the decision in front of you.
Mileage matters most on a 2018 Jeep Compass.
Of 2018 Jeep Compass vehicles with under 37,000 miles, 82 in every 100 passed their 2025 MOT first time. With 68,000 miles or more, 68 in every 100 did.
Petrol or diesel?
| Typical mileage | Passed first time, as tested | Passed first time, same mileage | |
|---|---|---|---|
| Petrol | 47,662 miles | 75 | 74 |
| Diesel | 59,448 miles | 72 | 75 |
Figures are in every 100 first tests. Petrol cars look better on the raw figures only because diesel cars have done more miles (typically 59,448 against 47,662). 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 37,000 | 47,000–56,000 | 68,000 and over | |
|---|---|---|---|
| Tyre tread depth (front) | 3.1 | 3.1 | 4.4 |
| Daytime running lights (front) | 1.3 | 1.9 | 4.6 |
| Individual sidelight or tail light (front) | 0.7 | 1.2 | 4.6 |
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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