The top 10 in this list, model by model
1 · About average
Peugeot 508
Why it ranks here: About as many MOT fails as cars the same age and mileage (ratio 0.99, 95% CI 0.98–1.00), from 72,823 MOT tests at 3 to 14 years. At typical mileage its rate would be about 26.1% (25.8%–26.4%), against 26.3% for all cars at the same ages; raw (its own ages and mileage) 28.6%. Rank range 1–2.
Check before you buy: fails on road wheels 1.3–1.6× as often as cars the same age (388 fails in 73,755 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at an executive car; the ones tested were mostly diesel.
2 · About average
Peugeot 108
Why it ranks here: About as many MOT fails as cars the same age and mileage (ratio 0.99, 95% CI 0.98–1.00), from 295,416 MOT tests at 3 to 11 years. At typical mileage its rate would be about 20.1% (19.9%–20.3%), against 20.3% for all cars at the same ages; raw (its own ages and mileage) 17.4%. Rank range 1–2.
Check before you buy: fails on brakes 1.26–1.30× as often as cars the same age (15,108 fails in 296,826 MOT tests at ages 3 to 15, not mileage-adjusted); fails on visibility 1.2–1.3× as often as cars the same age (12,589 fails in 296,826 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a city car; the ones tested were mostly petrol.
3 · About average
Peugeot 107
Why it ranks here: No clear difference from cars the same age and mileage by our 20% rule (ratio 1.03, 95% CI 1.03–1.04), from 356,451 MOT tests at 8 to 15 years. At typical mileage its rate would be about 37.2% (37.0%–37.3%), against 35.9% for all cars at the same ages; raw (its own ages and mileage) 33.7%. Rank range 3–3.
Check before you buy: fails on brakes 1.3–1.4× as often as cars the same age (38,794 fails in 358,231 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a city car; the ones tested were mostly petrol.
4 · About average
Peugeot 407
Why it ranks here: No clear difference from cars the same age and mileage by our 20% rule (ratio 1.07, 95% CI 1.05–1.09), from 16,107 MOT tests at 12 to 15 years. At typical mileage its rate would be about 43.5% (42.8%–44.2%), against 40.6% for all cars at the same ages; raw (its own ages and mileage) 45.9%. Rank range 4–4.
Check before you buy: fails on body and structure 2.5–2.7× as often as cars the same age (2,336 fails in 16,413 MOT tests at ages 3 to 15, not mileage-adjusted); fails on visibility 1.3–1.4× as often as cars the same age (1,319 fails in 16,413 MOT tests at ages 3 to 15, not mileage-adjusted); fails on lights and electrics 1.2–1.3× as often as cars the same age (3,717 fails in 16,413 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at an executive car; the ones tested were mostly diesel.
5 · About average
Peugeot RCZ
Why it ranks here: No clear difference from cars the same age and mileage by our 20% rule (ratio 1.11, 95% CI 1.10–1.13), from 43,337 MOT tests at 7 to 15 years. At typical mileage its rate would be about 36.6% (36.1%–37.0%), against 32.9% for all cars at the same ages; raw (its own ages and mileage) 34.8%. Rank range 5–5.
Check before you buy: fails on emissions and leaks 1.8–2.0× as often as cars the same age (2,713 fails in 44,125 MOT tests at ages 3 to 15, not mileage-adjusted); fails on body and structure 1.5–1.6× as often as cars the same age (2,312 fails in 44,125 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a sports car; the ones tested were 65% petrol, 35% diesel.
6 · About average
Peugeot 308
Why it ranks here: No clear difference from cars the same age and mileage by our 20% rule (ratio 1.17, 95% CI 1.17–1.17), from 521,547 MOT tests at 3 to 15 years. At typical mileage its rate would be about 32.8% (32.7%–33.0%), against 28.1% for all cars at the same ages; raw (its own ages and mileage) 34.0%. Rank range 6–6.
Check before you buy: fails on body and structure 1.99–2.03× as often as cars the same age (28,430 fails in 524,818 MOT tests at ages 3 to 15, not mileage-adjusted); fails on steering 1.6–1.7× as often as cars the same age (14,907 fails in 524,818 MOT tests at ages 3 to 15, not mileage-adjusted); fails on emissions and leaks 1.5–1.6× as often as cars the same age (21,863 fails in 524,818 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a family hatchback; the ones tested were 66% diesel, 34% petrol.
7 · 22% more MOT fails
Peugeot 3008
Why it ranks here: 22% more MOT fails than cars the same age and mileage (ratio 1.22, 95% CI 1.21–1.22), from 539,923 MOT tests at 3 to 15 years. At typical mileage its rate would be about 27.4% (27.3%–27.5%), against 22.5% for all cars at the same ages; raw (its own ages and mileage) 28.3%. Rank range 7–7.
Check before you buy: fails on seat belts and airbags 2.5–2.6× as often as cars the same age (7,270 fails in 542,666 MOT tests at ages 3 to 15, not mileage-adjusted); fails on body and structure 2.16–2.22× as often as cars the same age (20,687 fails in 542,666 MOT tests at ages 3 to 15, not mileage-adjusted); fails on steering 1.8–1.9× as often as cars the same age (11,624 fails in 542,666 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a family SUV; the ones tested were 68% diesel, 29% petrol.
8 · 26% more MOT fails
Peugeot 208
Why it ranks here: 26% more MOT fails than cars the same age and mileage (ratio 1.26, 95% CI 1.25–1.26), from 804,782 MOT tests at 3 to 13 years. At typical mileage its rate would be about 28.8% (28.7%–28.9%), against 22.9% for all cars at the same ages; raw (its own ages and mileage) 27.5%. Rank range 8–8.
Check before you buy: fails on body and structure 4.2–4.3× as often as cars the same age (56,339 fails in 809,087 MOT tests at ages 3 to 15, not mileage-adjusted); fails on emissions and leaks 2.8–2.9× as often as cars the same age (43,477 fails in 809,087 MOT tests at ages 3 to 15, not mileage-adjusted); fails on lights and electrics 1.46–1.48× as often as cars the same age (86,920 fails in 809,087 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a supermini; the ones tested were 79% petrol, 19% diesel.
9 · 29% more MOT fails
Peugeot 207
Why it ranks here: 29% more MOT fails than cars the same age and mileage (ratio 1.29, 95% CI 1.29–1.30), from 442,349 MOT tests at 9 to 15 years. At typical mileage its rate would be about 49.9% (49.7%–50.0%), against 38.5% for all cars at the same ages; raw (its own ages and mileage) 48.5%. Rank range 9–9.
Check before you buy: fails on body and structure 2.90–2.94× as often as cars the same age (63,287 fails in 446,234 MOT tests at ages 3 to 15, not mileage-adjusted); fails on lights and electrics 1.59–1.60× as often as cars the same age (117,360 fails in 446,234 MOT tests at ages 3 to 15, not mileage-adjusted); fails on emissions and leaks 1.46–1.49× as often as cars the same age (29,068 fails in 446,234 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a supermini; the ones tested were 66% petrol, 34% diesel.
10 · 32% more MOT fails
Peugeot 2008
Why it ranks here: 32% more MOT fails than cars the same age and mileage (ratio 1.32, 95% CI 1.32–1.33), from 494,032 MOT tests at 3 to 12 years. At typical mileage its rate would be about 25.1% (25.0%–25.3%), against 19.0% for all cars at the same ages; raw (its own ages and mileage) 24.8%. Rank range 10–10.
Check before you buy: fails on body and structure 6.9–7.1× as often as cars the same age (37,395 fails in 496,383 MOT tests at ages 3 to 15, not mileage-adjusted); fails on lights and electrics 1.79–1.82× as often as cars the same age (48,258 fails in 496,383 MOT tests at ages 3 to 15, not mileage-adjusted); fails on emissions and leaks 1.7–1.8× as often as cars the same age (12,453 fails in 496,383 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a small SUV; the ones tested were 61% petrol, 35% diesel.
How we rank
3,586,767 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.