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.

Which? Car Survey

Take part in the Which? Car Survey 2019

By Adrian Porter

Article 1 of 3

The Which? Car Survey 2019 is open to all - we need your help to find the most and least reliable cars on UK roads.

Put us to the test

Our Test Labs compare features and prices on a range of products. Try Which? to unlock our reviews. You'll instantly be able to compare our test scores, so you can make sure you don't get stuck with a Don't Buy.

UPDATE February 2019: The latest Which? Car survey has now closed. Thank you very much to everyone who took part.

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

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 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 of 2018 - 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 2018

The 2018 Which? Car Survey closed on the 1 March 2018. 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 2017 survey:

  • We received data on 50,742 cars in total, from 44,794 owners (some have more than one car).
  • Based on ownership figures, the most popular cars in the survey were both small cars - the Honda Jazz (2008-2015) and Ford Fiesta (2008-2017).
  • Based on cars aged 0-3 years, 47% of those who owned the least reliable car reported a breakdown.
  • City-car owners do the least mileage, at just over 5,000 miles on average.