Historical estimate

A breakdown or non-start within a year for a recent car

Probability:
4.9%
Odds:
1 to 19
dBan
−12.9 dBan

In the 2021 Which? UK Car Survey, 4.9% of cars aged up to four years had at least one breakdown or non-start during the preceding 12 months, about one in 20 cars in that age group.

Calculation

p ≈ 0.049 with at least one breakdown or non-start

Assumptions

This retrospective survey result covers UK cars aged 0–4 years in 2021. The whole survey included 48,034 respondents reporting on 56,853 cars. The published article does not give the age group’s separate sample size. The annual result is not a per-trip rate and does not describe all car ages or current reliability.

Sources

  1. Which?: 2021 UK Car Survey reliability findings 48,034 respondents and 56,853 cars overall, published 3 March 2022