We use cookies to allow us and selected partners to improve your experience and our advertising. By continuing to browse you consent to our use of cookies. You can understand more and change your cookies preferences here.

Coronavirus Read our latest advice
Reviews based on facts
Our rigorous tests find the facts, and our impartial reviews tell you the truth about how products perform. First month £5, then £9.99 per month, cancel anytime.
Try Which?
1 October 2020

Take part in the Which? Car Survey 2020

The Which? Car Survey 2020 has now closed - thank you for helping us to find the most and least reliable cars on UK roads.
Car survey speedometer
Adrian Porter

The 2020 Which? Car survey

The 2020 Which? Car Survey closed at 10:00am on 24 February 2020.

Whether your car is a flawless angel or a dodgy motor dogged by issues, we want to hear about it in our annual survey.

Why bother? Because while our in-depth lab tests reveal a car’s strengths and weaknesses, they won’t tell us what it’s like to live with – and that’s where you come in.

Thanks to the information you share with us, we can reveal which are the most and least reliable cars and car brands are the most and least reliable and what faults a car's likely to have. 

This means when the time comes to buy your next car, you can use our research to avoid an unreliable model that's going to leave you stranded at the side of the road. 

Every year, tens of thousands of people complete our annual Which? Car Survey. The information you provide is crucial.

How the Which? Car Survey helps you

Once results are in, we update: 

  • New and used car reviews - every review is updated with the latest reliability information. This means you'll know which cars you can trust, and which you can't 
  • Car reliability checker - our interactive tool reveals the most common faults for hundreds of new and used cars, giving you an idea of how much you're likely to fork out for repair bills
  • Most reliable car brands - we'll help you choose a car brand you can rely on
  • Top cars - our car experts will help you quickly pick the very best car for your needs, plus we reveal the models you should steer clear of

Finding the most reliable cars

Whether you’re buying a new car or something a little older, we can help you find a model you can rely on.

We dig as deeply as we can into each car’s track record, going back a maximum of eight years. To make sure we rate cars fairly, we classify every fault we hear about as one of the following:

  • Most-serious faults are major problems that are likely to result in a breakdown, are expensive to repair and likely to lead to the car being off the road for more than one day.
  • Serious faults are likely to result in a breakdown and will either be expensive to fix, or keep the car off the road for more than a day.
  • Medium-rated faults are likely to cause a breakdown, but not be expensive or time consuming to repair.
  • Less-serious faults are unlikely to require immediate repair work, but could still be costly to fix.
  • Least-serious faults are non-essential problems that require less than a day off the road, and are cheap to put right.

When manufacturers ask why a car has scored poorly in the survey, we share as much detail as we can to help them get to the root of a problem. So these results not only help us compare different cars, they also give carmakers a reason to keep evolving and improving their products.

Best cars to drive in the UK

Satisfaction counts for an awful lot when it comes to customer loyalty. A happy owner is likely to buy another car from the same manufacturer and wholeheartedly recommend it to others.

That’s precisely why our survey asks owners to rate (out of five) how satisfied they are with their car, and also how likely they are to recommend it to a friend. By combining the responses to these two questions, we’re able to award each car a customer score as a percentage.

We reveal the cars you love and hate.

Which? Car Survey 2019

The previous car survey, the 2019 Which? Car Survey, closed on the 24 February 2019. By completing the survey, you not only helped us find the most reliable cars in the UK, but one lucky person won the big prize of £2,500.

But it's not just car reliability the survey reveals - here are some interesting facts from the 2019 survey:

  • We received data on 52,443 cars in total, from 43,958 owners (some have more than one car).
  • We found five cars with faults so common, we challenged the manufacturers to recall them.
  • Electric cars owners are some of the most satisfied car owners: and cover over 9,000 miles per year on average
  • Among cars aged less than three years old, the leats reliable car had 42% of owners report san issue in the the twelve months prior to answering the survey: and went an average of over six days without the use of their car.
  • City-car owners do the least mileage, at just under 6,500 miles on average.
View all New and used cars