25 most unreliable new cars

Some cars motor along for years without missing a beat, but others are afflicted by fault after fault. Here's our round-up of the most problematic 25 cars aged up to four years old...

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Claire Evans
19 December 2017

Mercedes-Benz E-Class
Mercedes-Benz E-Class

15. Mercedes-Benz E-Class (2016-present)

Score 83.5%

Bodywork issues were also reported on latest Mercedes-Benz E-Class, along with in-car electrics (8%) and sat-nav (6%). More than a third (37%) of cars suffered an issue, but virtually all were fixed for free. Around a third took longer than a week to repair.

Mercedes-Benz E-Class

14. Mercedes-Benz C-Class (2014-present)

Score 83.1%

A prestige brand image isn’t always an indicator of superior quality, as the data for the Mercedes-Benz C-Class shows; nearly a third of cars presented a problem. Most were back on the road within a week, though, and only a few owners had to pay for repairs.

Read our full Mercedes-Benz C-Class review

Get a great deal on a Mercedes-Benz C-Class with What Car?'s New Car Buyer service


Renault Zoe

13. Renault Zoe (2013-present) 

Score 83.0%

The Renault Zoe can’t match the exemplary record of its main rival, the Nissan Leaf; 36% suffered faults, of which 21% were engine electrics. More than half of Zoes were forced off the road for more than a week, but all were repaired under warranty.

Citroen C4 Cactus

12. Citroen C4 Cactus (2014-present)

Score 82.5%

The Citroën C4 Cactus may look hardy, but in reality 19% of these small SUVs developed a fault. The main trouble area was engine electrics (14%), followed by the brakes, engine and wheels/tyres. Most cars were rendered undrivable and some cost up to £750 to repair.

Read our full Citroen C4 Cactus review

Get a great deal on a Citroen C4 Cactus with What Car?'s New Car Buyer service


Audi Q5

11. Audi Q5 (2008-2017)

Score 82.1%

Almost a third of Q5 owners told us their car had suffered a fault, with bodywork the most common complaint. There were also issues with engine and non-engine electrics, air conditioning, and the fuel and exhaust systems. More than half of the cars we were told about couldn't be driven, but all were fixed under warranty. 

Read our full Audi Q5 review

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