Is the Mini John Cooper Works reliable?

On MOT evidence the Mini John Cooper Works is well above average. It passes 83.8% of tests once age and mileage are accounted for, against a national average of 72.3%. That figure covers 69% of the national age and mileage range, which is enough to quote but not to rank. This measures how often the car meets the MOT standard, not how often it breaks down or what a repair costs.

What is the most common MOT failure on a Mini John Cooper Works?

The item recorded most often is "A tyre seriously damaged", which appears in 27.9% of failed Mini John Cooper Works tests. Because one failed test can list several items, these shares do not add up to 100%.

What do testers most often warn about on a Mini John Cooper Works?

The most common advisory is "Tyre tread depth not in accordance with the requirements", noted on 14.0% of all Mini John Cooper Works tests. An advisory is not a failure: it flags something that will likely need attention before the next test.

What mileage does a Mini John Cooper Works usually have at its MOT?

The average odometer reading recorded at test is 41,008 miles. This is the mileage across all tested examples of every age, not an annual figure, so treat it as a description of the fleet rather than a target for one car.

Does a Mini John Cooper Works get harder to pass as it ages?

Yes. At 3 to 5 years old, 90.3% of Mini John Cooper Works tests pass. By fifteen years or more, that falls to 74.6%. Nearly every model follows this pattern, which is why comparing raw pass rates between models is misleading unless age is accounted for.

Model reliability file

Mini John Cooper Works MOT pass rate & common failures

From 22,101 recorded MOT tests of the Mini John Cooper Works, published by DVSA.

Data updated 29 July 2026

Quick answer

The Mini John Cooper Works passes 83.8% of MOT tests once results are adjusted for the age and mileage of the cars tested, against a national average of 72.3%. That is well above average. Based on 22,101 tests. Its most commonly recorded failure is tyre seriously damaged, which appears in 27.9% of failed tests. Cars of this model average 41,008 miles on the odometer when tested.

At a glance

Pass rate, adjusted for age and mileage

83.8%national average72.3%unadjusted86.6%range covered69%

The John Cooper Works is 11.5 percentage points above the national pass rate once age and mileage are accounted for, which is well above average. The unadjusted figure is 86.6%; the difference is what the age and mileage of this model’s fleet was hiding.

DVSA recorded wording

Most common failure items

Share of failed Mini John Cooper Works tests in which each item was recorded. One failed test often lists several items, so these do not sum to 100%.

1.A tyre seriously damaged27.9%
696 occurrencesTyre damaged or deteriorated explained
2.A tyre seriously damaged18.7%
467 occurrencesTyre damaged or deteriorated explained
3.Tyre tread depth not in accordance with the requirements11.2%
279 occurrencesTyre worn close to the legal limit explained
4.Wiper blade missing or obviously not clearing the windscreen9.8%
244 occurrencesWiper or washer not working properly explained
5.A tyre cords visible or damaged9.5%
237 occurrencesTyre ply or cord exposed, or the casing separating explained
6.A brake lining or pad worn below 1.5mm6.4%
159 occurrencesBrake drum or shoe worn or contaminated explained
7.A tyre has a lump, bulge or tear caused by separation or partial failure of its structure. This includes any lifting of the tread rubber5.4%
135 occurrencesTyre ply or cord exposed, or the casing separating explained
8.A tyre seriously damaged4.8%
119 occurrencesTyre damaged or deteriorated explained
9.A spring or spring component fractured or seriously weakened3.4%
85 occurrencesRoad spring broken or fractured explained
10.A shock absorber damaged to the extent that it does not function or showing signs of severe leakage3.3%
82 occurrencesShock absorber defective explained

Warnings without a failure

Most common advisories

Share of all Mini John Cooper Works tests carrying each advisory. The denominator differs from the failure list above because an advisory can be issued on a car that passed.

1.Tyre tread depth not in accordance with the requirements14.0%
3,094 testsTyre worn close to the legal limit explained
2.A tyre seriously damaged11.9%
2,620 testsTyre damaged or deteriorated explained
3.A brake lining or pad worn below 1.5mm7.9%
1,742 testsBrake drum or shoe worn or contaminated explained
4.Brake disc or drum excessively weakened, insecure or fractured5.3%
1,163 testsBrake disc worn, pitted or scored explained
5.A tyre seriously damaged2.5%
547 testsTyre damaged or deteriorated explained
6.A suspension pin, bush or joint excessively worn2.2%
492 testsSuspension arm bush worn explained
7.Tyre tread depth not in accordance with the requirements1.8%
401 testsTyre worn close to the legal limit explained
8.A spring or spring component fractured or seriously weakened1.5%
342 testsRoad spring broken or fractured explained

How wear changes the picture

Pass rate by vehicle age

3–5 yrs90%

6–8 yrs86%

9–11 yrs83%

12–14 yrs78%

15+ yrs75%

Bands holding too few tests to be meaningful are omitted rather than shown as a rate.

What gets tested

The John Cooper Works fleet

Average mileage recorded at test: 41,008
Fuel mix of tested cars: Petrol99.9%

Trim names grouped into this model (2)

Recorded exactly as DVSA holds them. Trim-level names are rolled up so one model is not split across a dozen thin pages.

JOHN COOPER WORKS AUTO
JOHN COOPER WORKS COUPE

Check a specific Mini John Cooper Works

A model average tells you the pattern. Its own MOT record tells you the car.

Compare within the range

Other Mini models

Mini Cooper — 75.9% adjusted
Mini Mini — 69.4% adjusted
Mini Countryman — 79.9% adjusted
Mini One — 73.9% adjusted
Mini Clubman — 76.8% adjusted
Mini Paceman — 81.6% unadjusted
All Mini models

Similar test volumes

Compare against other makes

Mercedes-Benz CLS — 76.4% adjusted, ranked 93
Jaguar XJ — 79.9% adjusted, ranked 57
Smart (mcc) Forfour — 64.8% adjusted, ranked 223
BMW 6 Series — 81.4% adjusted, ranked 46

Common questions

Is the Mini John Cooper Works reliable?: On MOT evidence the Mini John Cooper Works is well above average. It passes 83.8% of tests once age and mileage are accounted for, against a national average of 72.3%. That figure covers 69% of the national age and mileage range, which is enough to quote but not to rank. This measures how often the car meets the MOT standard, not how often it breaks down or what a repair costs.
What is the most common MOT failure on a Mini John Cooper Works?: The item recorded most often is "A tyre seriously damaged", which appears in 27.9% of failed Mini John Cooper Works tests. Because one failed test can list several items, these shares do not add up to 100%.
What do testers most often warn about on a Mini John Cooper Works?: The most common advisory is "Tyre tread depth not in accordance with the requirements", noted on 14.0% of all Mini John Cooper Works tests. An advisory is not a failure: it flags something that will likely need attention before the next test.
What mileage does a Mini John Cooper Works usually have at its MOT?: The average odometer reading recorded at test is 41,008 miles. This is the mileage across all tested examples of every age, not an annual figure, so treat it as a description of the fleet rather than a target for one car.
Does a Mini John Cooper Works get harder to pass as it ages?: Yes. At 3 to 5 years old, 90.3% of Mini John Cooper Works tests pass. By fifteen years or more, that falls to 74.6%. Nearly every model follows this pattern, which is why comparing raw pass rates between models is misleading unless age is accounted for.

How this was worked out

Method and limits

Figures come from the DVSA anonymised MOT testing dataset, published under the Open Government Licence. Only class 4 initial tests are counted: retests are excluded so a car appears once, and abandoned tests are excluded entirely. The adjusted rate is directly standardised across twenty-five age and mileage bands and reweighted onto the national distribution, so this model is compared against cars that have lived a similar life rather than against a younger or lighter-used fleet.

An MOT measures whether a car met a legal standard on the day. It is not a breakdown record, a service history or a running-cost estimate, and a pass rate is a property of a fleet rather than a prediction about one car.