The top 10 in this list, model by model
1 · 40% fewer MOT fails
Audi S3
Why it ranks here: 40% fewer MOT fails than cars the same age and mileage (ratio 0.60, 95% CI 0.58–0.63), from 12,979 MOT tests at 3 to 4, 9 to 11 and 13 to 15 years. At typical mileage its rate would be about 14.4% (13.9%–15.0%), against 23.9% for all cars at the same ages; raw (its own ages and mileage) 14.7%. Rank range 1–2.
Check before you buy: no part fails significantly more often than on cars the same age (ages 3 to 15).
Suits: buyers looking at a family hatchback; the ones tested were mostly petrol.
2 · 39% fewer MOT fails
Lexus CT
Why it ranks here: 39% fewer MOT fails than cars the same age and mileage (ratio 0.61, 95% CI 0.60–0.61), from 122,611 MOT tests at 3 to 14 years. At typical mileage its rate would be about 15.6% (15.4%–15.8%), against 25.8% for all cars at the same ages; raw (its own ages and mileage) 15.9%. Rank range 1–2.
Check before you buy: no part fails significantly more often than on cars the same age (ages 3 to 15).
Suits: buyers looking at a family hatchback; the ones tested were mostly hybrid.
3 · 32% fewer MOT fails
Subaru Impreza
Why it ranks here: 32% fewer MOT fails than cars the same age and mileage (ratio 0.68, 95% CI 0.66–0.70), from 10,729 MOT tests at 12 to 15 years. At typical mileage its rate would be about 27.6% (26.7%–28.4%), against 40.7% for all cars at the same ages; raw (its own ages and mileage) 27.3%. Rank range 3–3.
Check before you buy: fails on emissions and leaks 1.7–1.9× as often as cars the same age (993 fails in 11,193 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a family hatchback; the ones tested were mostly petrol.
4 · 29% fewer MOT fails
Toyota Prius
Why it ranks here: 29% fewer MOT fails than cars the same age and mileage (ratio 0.71, 95% CI 0.71–0.72), from 543,018 MOT tests at 3 to 15 years. At typical mileage its rate would be about 17.7% (17.6%–17.8%), against 24.8% for all cars at the same ages; raw (its own ages and mileage) 19.7%. Rank range 4–4.
Check before you buy: fails on road wheels 1.3–1.4× as often as cars the same age (2,540 fails in 547,101 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a family hatchback; the ones tested were mostly hybrid.
5 · About average
Honda Insight (first used from 2009)
Why it ranks here: No clear difference from cars the same age and mileage by our 20% rule (ratio 0.78, 95% CI 0.77–0.79), from 31,500 MOT tests at 10 to 15 years. At typical mileage its rate would be about 29.3% (28.8%–29.8%), against 37.6% for all cars at the same ages; raw (its own ages and mileage) 30.1%. Rank range 5–7.
Check before you buy: no part fails significantly more often than on cars the same age (ages 3 to 15).
Suits: buyers looking at a family hatchback; the ones tested were 45% hybrid, 29% unknown; this row covers cars first used from 2009.
6 · 21% fewer MOT fails
Volkswagen Golf
Why it ranks here: 21% fewer MOT fails than cars the same age and mileage (ratio 0.79, 95% CI 0.79–0.79), from 2,847,847 MOT tests at 3 to 15 years. At typical mileage its rate would be about 20.6% (20.5%–20.6%), against 26.1% for all cars at the same ages; raw (its own ages and mileage) 21.4%. Rank range 5–7.
Check before you buy: no part fails significantly more often than on cars the same age (ages 3 to 15).
Suits: buyers looking at a family hatchback; the ones tested were 49% diesel, 49% petrol.
7 · About average
Toyota Corolla (first used from 2019)
Why it ranks here: No clear difference from cars the same age and mileage by our 20% rule (ratio 0.80, 95% CI 0.79–0.81), from 180,747 MOT tests at 3 to 6 years. At typical mileage its rate would be about 9.7% (9.6%–9.9%), against 12.2% for all cars at the same ages; raw (its own ages and mileage) 10.8%. Rank range 5–8.
Check before you buy: no part fails significantly more often than on cars the same age (ages 3 to 15).
Suits: buyers looking at a family hatchback; the ones tested were mostly hybrid; this row covers cars first used from 2019.
8 · About average
Audi A3
Why it ranks here: No clear difference from cars the same age and mileage by our 20% rule (ratio 0.80, 95% CI 0.80–0.80), from 1,461,887 MOT tests at 3 to 15 years. At typical mileage its rate would be about 21.0% (21.0%–21.1%), against 26.2% for all cars at the same ages; raw (its own ages and mileage) 22.1%. Rank range 7–8.
Check before you buy: fails on seat belts and airbags 1.2–1.3× as often as cars the same age (11,889 fails in 1,469,160 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a family hatchback; the ones tested were 50% diesel, 49% petrol.
9 · About average
Skoda Octavia
Why it ranks here: No clear difference from cars the same age and mileage by our 20% rule (ratio 0.83, 95% CI 0.82–0.83), from 723,901 MOT tests at 3 to 15 years. At typical mileage its rate would be about 20.0% (19.9%–20.1%), against 24.2% for all cars at the same ages; raw (its own ages and mileage) 21.8%. Rank range 9–11.
Check before you buy: fails on seat belts and airbags 1.2–1.3× as often as cars the same age (5,402 fails in 727,126 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a family hatchback; the ones tested were 64% diesel, 35% petrol.
10 · About average
BMW 1 Series
Why it ranks here: No clear difference from cars the same age and mileage by our 20% rule (ratio 0.84, 95% CI 0.83–0.84), from 1,432,565 MOT tests at 3 to 15 years. At typical mileage its rate would be about 21.6% (21.5%–21.6%), against 25.8% for all cars at the same ages; raw (its own ages and mileage) 22.5%. Rank range 10–12.
Check before you buy: fails on road wheels 2.5–2.6× as often as cars the same age (13,147 fails in 1,440,178 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a family hatchback; the ones tested were 55% diesel, 45% petrol.
How we rank
21,003,731 MOT tests from 2022–2025 of cars 3 to 15 years old. For each model and age, the tests are split into 6 mileage bands (<30k, 30-60k, 60-90k, 90-120k, 120-150k, 150k+); the expected fails are what all cars of that age would fail in the same bands, corrected to the model's own mix of test years. The ratio of the model's fails to the expected fails sets its place. The adjusted rate is that ratio times the all-car rate at the model's own ages, so it reads against that rate: a model tested only at 3 to 5 years is compared with young cars, not with this list's average.
The 95% intervals cover sampling error only (Wilson intervals). A model is called fewer or more only when its interval is at least 20% from the all-car rate, overall and at 3 or more ages ("close to average" when the interval excludes the all-car rate by less); awards use the same rule. Test years: Each model's expected fails therefore use its own mix of test years 2022–2025, age by age; the mileage bands themselves pool the four years, which can leave a small bias in favour of models first sold late in the window. Generations of a model are pooled unless the data splits them; each row says which years it covers. How we compare
Limitation: MOT tests record roadworthiness defects on the test day. They do not record breakdowns, engine or gearbox faults, or repair costs, and they cannot separate design from upkeep: a model whose owners service it before every MOT looks better here. Only cars still on the road are tested.