Looking for a reliable car that won’t let you down? Whether you’re after a new or used model, our unique survey reveals the most-reliable vehicles in the UK

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Comfort, economy and performance count for nothing if your car spends half its time in a garage. Our unique survey reveals the most-reliable cars in the UK. In our Which? Car Survey, we ask thousands of motorists about their cars, what issues they’ve had and if they’ve broken down, so we can reveal the most-reliable cars on the market. With the data we collect, we can determine how reliable a model of car is in its first four years since being manufactured, aged 5-9 years and 10-15 years. If we find one that’s too unreliable, then it can’t be a Best Buy, regardless of how well it performed in our tests. For example, the least-reliable car was reported to have spent a hefty average of 18 days off the road being repaired in the year covered by our survey.   As a Which? member, you get exclusive access to our most-reliable car brands tool below, helping you choose a new or used vehicle that won’t let you down. Keep reading to see the results our survey.

Revealed: the most reliable cars

We’ve surveyed more than 48,000 car owners in order to give you robust reliability ratings for hundreds of cars. Use this research to make sure you don’t throw away your money on one that will let you down.

Car reliability

In our survey, we heard from more than 48,000 motorists about their cars, including the problems they experienced and whether theirs broke down.  Here’s a snapshot of our research:  A total of 48,034 drivers reported on 56,853 cars – thank you to everyone who took part in our survey. Only 10 cars managed a full five-star rating in the 0-4 and 5-9 year age groups, including one of the best-selling models in the UK.  19% of owners of a UK best-selling car reported battery problems.

Most and least-reliable new cars

Most-reliable new car

Honda Jazz (2020-present)       ★ ★ ★ ★ ★ ★ 

It doesn’t get much better than this – an incredible 100% of owners reported no faults whatsoever in the year covered by our latest survey, with no breakdowns at all, either. If reliability is important to you, look no further than the Honda Jazz.

Least-reliable new car

 Alpine A110 (2019 – present) ★ ☆ ☆ ☆ ☆

An alarmingly high 55% of Apline A110 owners had at least one problem that needed a professional fix in the year covered by our reliability survey. What’s more, owners said their car spent an average of 18 days off the road in the year covered by our survey, with 52% experiencing their car brake down.

Most and least-reliable used cars

Most-reliable used car

Mazda MX-5 (2015-present)      ★ ★ ★ ★ ★ ★ 

Only 11% of owners experienced a fault with their car in the 12 months before our survey and faults reported were relatively minor. Only 2% of cars broke down.

Least-reliable used car

 Tesla Model S (2013-present)     ★ ☆ ☆ ☆ ☆

58% of owners of this car had to get at least one fault fixed in the 12 months before our survey. There were numerous types of issues and 13% of cars actually broke down.

What is reliability?

To put the our reliability ratings into context, the table below shows the average fault rates per star rating and age group.

Age group         Reliability rating          Fault rate

0-4 years           Five stars                          11%

Three stars                       25%

One star                            40%

5-9 years           Five stars                          18%

Three stars                       31%

One star                              46%

10-15 years       Five stars                          25%

Three stars                       42%

One star                             57%

Which brand makes the most reliable cars?

If you’ve not yet decided on a model and want to narrow down your search, you can see which manufacturer puts the most effort into making sure its cars don’t break down and develop faults.

We’ve looked at the cars from 36 different manufacturers to find out which brand makes the most reliable vehicles.  Head to our most reliable car brands to see which manufacturers we recommend for reliability.