The top 10 in this list, model by model
1 · About average
Citroen C-Crosser
Why it ranks here: About as many MOT fails as cars the same age and mileage (ratio 1.02, 95% CI 0.99–1.05), from 4,709 MOT tests at 13 to 15 years. At typical mileage its rate would be about 41.6% (40.3%–43.0%), against 40.9% for all cars at the same ages; raw (its own ages and mileage) 44.8%. Rank range 1–2.
Check before you buy: fails on steering 3.5–4.1× as often as cars the same age (560 fails in 4,871 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a family SUV; the ones tested were mostly diesel.
2 · About average
Citroen C1
Why it ranks here: No clear difference from cars the same age and mileage by our 20% rule (ratio 1.05, 95% CI 1.04–1.05), from 594,412 MOT tests at 3 to 15 years. At typical mileage its rate would be about 30.1% (29.9%–30.2%), against 28.7% for all cars at the same ages; raw (its own ages and mileage) 27.5%. Rank range 1–2.
Check before you buy: fails on brakes 1.38–1.40× as often as cars the same age (51,171 fails in 597,337 MOT tests at ages 3 to 15, not mileage-adjusted); fails on emissions and leaks 1.22–1.25× as often as cars the same age (20,722 fails in 597,337 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
Citroen C3 Aircross
Why it ranks here: No clear difference from cars the same age and mileage by our 20% rule (ratio 1.08, 95% CI 1.07–1.10), from 109,475 MOT tests at 3 to 7 years. At typical mileage its rate would be about 14.8% (14.6%–15.1%), against 13.7% for all cars at the same ages; raw (its own ages and mileage) 13.9%. Rank range 3–3.
Check before you buy: fails on body and structure 6.8–7.3× as often as cars the same age (3,223 fails in 110,010 MOT tests at ages 3 to 15, not mileage-adjusted); fails on brakes 1.6–1.7× as often as cars the same age (4,277 fails in 110,010 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a small SUV; the ones tested were mostly petrol.
4 · About average
Citroen C5
Why it ranks here: No clear difference from cars the same age and mileage by our 20% rule (ratio 1.14, 95% CI 1.12–1.15), from 64,563 MOT tests at 3 to 6 and 10 to 15 years. At typical mileage its rate would be about 24.4% (24.1%–24.7%), against 21.5% for all cars at the same ages; raw (its own ages and mileage) 25.1%. Rank range 4–5.
Check before you buy: fails on body and structure 2.5–2.6× as often as cars the same age (3,122 fails in 65,337 MOT tests at ages 3 to 15, not mileage-adjusted); fails on steering 1.5–1.7× as often as cars the same age (1,119 fails in 65,337 MOT tests at ages 3 to 15, not mileage-adjusted); fails on lights and electrics 1.48–1.54× as often as cars the same age (7,350 fails in 65,337 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at an executive car; the ones tested were 65% diesel, 35% petrol.
5 · About average
Citroen Xsara
Why it ranks here: No clear difference from cars the same age and mileage by our 20% rule (ratio 1.15, 95% CI 1.14–1.17), from 28,129 MOT tests at 12 to 15 years. At typical mileage its rate would be about 47.4% (46.9%–48.0%), against 41.2% for all cars at the same ages; raw (its own ages and mileage) 47.8%. Rank range 4–5.
Check before you buy: fails on seat belts and airbags 5.2–5.7× as often as cars the same age (2,194 fails in 28,578 MOT tests at ages 3 to 15, not mileage-adjusted); fails on body and structure 2.3–2.5× as often as cars the same age (3,943 fails in 28,578 MOT tests at ages 3 to 15, not mileage-adjusted); fails on lights and electrics 1.29–1.35× as often as cars the same age (6,863 fails in 28,578 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a family hatchback; the ones tested were 58% petrol, 42% diesel.
6 · About average
Citroen C2
Why it ranks here: No clear difference from cars the same age and mileage by our 20% rule (ratio 1.21, 95% CI 1.19–1.23), from 16,032 MOT tests at 13 to 15 years. At typical mileage its rate would be about 49.8% (49.0%–50.6%), against 41.3% for all cars at the same ages; raw (its own ages and mileage) 47.4%. Rank range 6–7.
Check before you buy: fails on body and structure 2.3–2.5× as often as cars the same age (2,277 fails in 16,306 MOT tests at ages 3 to 15, not mileage-adjusted); fails on visibility 1.7–1.9× as often as cars the same age (1,763 fails in 16,306 MOT tests at ages 3 to 15, not mileage-adjusted); fails on seat belts and airbags 1.7–2.0× as often as cars the same age (428 fails in 16,306 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a supermini; the ones tested were mostly petrol.
7 · About average
Citroen C4 Picasso
Why it ranks here: No clear difference from cars the same age and mileage by our 20% rule (ratio 1.25, 95% CI 1.23–1.28), from 24,782 MOT tests at 4 to 9 years. At typical mileage its rate would be about 23.6% (23.1%–24.2%), against 18.9% for all cars at the same ages; raw (its own ages and mileage) 23.3%. Rank range 6–8.
Check before you buy: fails on body and structure 2.9–3.3× as often as cars the same age (759 fails in 25,245 MOT tests at ages 3 to 15, not mileage-adjusted); fails on lights and electrics 1.5–1.6× as often as cars the same age (1,963 fails in 25,245 MOT tests at ages 3 to 15, not mileage-adjusted); fails on suspension 1.4–1.5× as often as cars the same age (1,384 fails in 25,245 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at an MPV; the ones tested were mostly diesel.
8 · 27% more MOT fails
Citroen C3
Why it ranks here: 27% more MOT fails than cars the same age and mileage (ratio 1.27, 95% CI 1.26–1.27), from 673,810 MOT tests at 3 to 15 years. At typical mileage its rate would be about 34.1% (34.0%–34.2%), against 26.9% for all cars at the same ages; raw (its own ages and mileage) 32.6%. Rank range 7–8.
Check before you buy: fails on body and structure 2.7–2.8× as often as cars the same age (46,919 fails in 677,231 MOT tests at ages 3 to 15, not mileage-adjusted); fails on steering 1.96–2.01× as often as cars the same age (21,572 fails in 677,231 MOT tests at ages 3 to 15, not mileage-adjusted); fails on lights and electrics 1.5–1.6× as often as cars the same age (102,735 fails in 677,231 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a supermini; the ones tested were 65% petrol, 35% diesel.
9 · 31% more MOT fails
Citroen C4
Why it ranks here: 31% more MOT fails than cars the same age and mileage (ratio 1.31, 95% CI 1.31–1.32), from 507,153 MOT tests at 3 to 15 years. At typical mileage its rate would be about 36.7% (36.6%–36.8%), against 28.0% for all cars at the same ages; raw (its own ages and mileage) 38.2%. Rank range 9–9.
Check before you buy: fails on body and structure 2.99–3.04× as often as cars the same age (39,608 fails in 510,583 MOT tests at ages 3 to 15, not mileage-adjusted); fails on steering 2.08–2.14× as often as cars the same age (18,325 fails in 510,583 MOT tests at ages 3 to 15, not mileage-adjusted); fails on lights and electrics 1.68–1.70× as often as cars the same age (86,805 fails in 510,583 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at a family hatchback; the ones tested were 77% diesel, 22% petrol.
10 · 41% more MOT fails
Citroen C4 Grand Picasso
Why it ranks here: 41% more MOT fails than cars the same age and mileage (ratio 1.41, 95% CI 1.40–1.43), from 86,056 MOT tests at 3 to 15 years. At typical mileage its rate would be about 31.3% (31.0%–31.6%), against 22.1% for all cars at the same ages; raw (its own ages and mileage) 33.1%. Rank range 10–10.
Check before you buy: fails on body and structure 3.3–3.5× as often as cars the same age (4,936 fails in 87,133 MOT tests at ages 3 to 15, not mileage-adjusted); fails on steering 2.0–2.2× as often as cars the same age (1,972 fails in 87,133 MOT tests at ages 3 to 15, not mileage-adjusted); fails on lights and electrics 2.0–2.1× as often as cars the same age (12,622 fails in 87,133 MOT tests at ages 3 to 15, not mileage-adjusted).
Suits: buyers looking at an MPV; the ones tested were mostly diesel.
How we rank
2,213,659 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.