Honest John Satisfaction Index 2021: The 10 most unreliable cars

These are the UK's worst cars for reliability, based on the results of the Honest John Satisfaction Index 2021. 

Thousands of vehicle owners were asked to score their cars out of 10 for reliability. These are the cars that achieved the worst average scores across the 2021 Index with a minimum of 20 individual submissions per model.  

>>> The Honest John Satisfaction Index 2021 results in full

1

Mercedes-Benz A-Class

Reliability average score: 8.45

The A-Class is an affordable hatchback that gives Mercedes-Benz ownership to the masses. Sadly, for many drivers, the ownership experience falls short of what's expected. Not only does the A-Class get one of the lowest overall scores in the Satisfaction Index but it also has the worst average score for reliability. 

Read the Mercedes-Benz A-Class review

2

Mercedes-Benz C-Class Estate (2014-2021)

Reliability average score: 8.50

The C-Class Estate is a popular premium car but, like the A-Class, the ownership experience falls short of expectation with poor Satisfaction Index scores. Owners gave the C-Class Estate just 8.50 out of 10 for reliability while repair costs were heavily criticised with a disappointing average of just 7.25. 

Read the Mercedes-Benz C-Class Estate (2014 - 2021) review

3

Nissan Qashqai (2014-2021)

Reliability average score: 8.58

The Qashqai is the UK's best selling crossover but feedback from owners paints a disappointing picture when it comes to all-important reliability. The Qashqai scores a lowly average of just 8.58 out of 10. Nissan launched an all-new version of the Qashqai in 2021, which will hopefully bring much-needed improvements in reliability. 

Read the Nissan Qashqai (2014 - 2021) review

4

Jaguar XF

Reliability average score: 8.72

Owners praise the Jaguar XF for its performance, comfort and ease of use. However, when it comes to reliability and cost of repair, things are less impressive with the XF averaging just 8.72 and 8.22 out of 10 respectively. This sleek Jaguar is also criticised for poor fuel economy, which means the XF ownership is something of an expensive experience.

Read the Jaguar XF review

5

Land Rover Discovery Sport

Reliability average score: 8.81

The Discovery Sport is one of Land Rover's best-selling models; however, when it comes to owner satisfaction, drivers say they feel short-changed. The Discovery Sport averages just 8.81 out of 10 for reliability with a long list of build quality concerns and diesel engine problems reported by owners. 

Read the Land Rover Discovery Sport review

6

Jaguar XF (2008-2015)

Reliability average score: 8.85

No, your eyes do not deceive you, this is indeed a second entry for the Jaguar XF. However, in a strange twist, the older model - sold from 2008 to 2015 - proves to be slightly more reliable than the newer, more expensive XF. That said, the old shape XF gets one of the worst scores for repair costs which means problems are frequent and often expensive to put right. 

Read the Jaguar XF (2008 - 2015) review

7

Peugeot 3008

Reliability average score: 8.96

When Peugeot reinvented the 3008 as a crossover in 2017 it was hailed as a major milestone for the French carmaker, with the 3008 introducing new levels of style and quality that were missing from its predecessor. However, things are less impressive when it comes to reliability with the 1.2 PureTech petrol engine being a particular area of concern. 

Read the Peugeot 3008 review

8

Skoda Octavia vRS (2013-2020 )

Reliability average score: 9.00

Fun, fast and practical, the Skoda Octavia vRS has all of the ingredients for a brilliant family car. Sadly, reliability appears to be missing from the mix with the previous generation Octavia vRS getting an average score of 9.00 out of 10. Skoda launched an all-new model in 2020 and, like the Fiesta, problems appear to be less prevalent. 

Read the Skoda Octavia vRS (2013 - 2020) review

9

Ford Fiesta (2013-2017)

Reliability average score: 9.00

The Ford Fiesta is Britain's best-selling car but the previous-gen model is something of a mixed bag when it comes to reliability. Most complaints centre around the 1.0 EcoBoost engine, which results in the Fiesta getting a reliability average of 9.00 out of 10. Thankfully, problems with the latest model, launched in 2017, appear to be less common. 

Read the Ford Fiesta (2013 - 2017) review

10

Volvo XC60 (2008-2017)

Reliability average score: 9.04

The Volvo XC60 - built from 2008 to 2017 - is the final entry in this top 10. On the face of it, the XC60's score of 9.04 out of 10 isn't all that bad. And with the earliest models pushing 14 years of age, it could be argued that wear and tear problems are to be expected. That said, owners are critical of the XC60's reliability and expensive repair costs. 

Read the Volvo XC60 (2008 - 2017) review