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13 April 2021

Take part in the Which? Car Survey 2021

The Which? Car Survey 2021 is open to the UK public - and there's £2,500 up for grabs
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Adrian Porter

The Which? Car Survey 2021

The Which? Car Survey 2021 is now open to the UK public - you don't need to be a Which? member to take part.

Click to take part in the Which? Car Survey 2021.

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 least and most reliable cars and reliable car brands. Plus 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 
  • Most reliable cars - 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 up to ten 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 vehicles.

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.

Last year's survey: Which? Car Survey 2020

The previous car survey, the Which? Car Survey 2020, closed at 10:00am on the 24 February 2020. If you completed 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.

It's not just car reliability the survey reveals - here are some interesting facts from the 2020 survey:

  • We received data on 55,833 cars in total, from 47,013 owners (some have more than one car).
  • We found seven five cars with faults so common, we challenged the manufacturers to recall them.
  • We revealed that luxury cars are more likely to have faults
  • Electric cars owners are some of the most satisfied car owners: and cover over 9,000 miles per year on average
  • We also found out that 97% of electric car owners have not had to replace their battery, and revealed just how electric car batteries degrade and lose range
  • Among cars aged less than three years old, some of the least reliable models had 60% of owners report at least one fault occurring within the the twelve months prior to answering the survey: and went an average of four to six days without the use of their car while it was off being fixed.
  • City-car owners do the least mileage, at just under 6,700 miles on average. 

View all New and used cars