25 most unreliable cars

While some cars never go wrong, others are afflicted by numerous faults. Here's our round-up of the most problematic models aged up to five years old...

Land Rover Discovery front three quarters

5. Land Rover Discovery (2015-present)

Reliability rating: 77.9%

Although 34% of Discoverys had a problem, the most frequently cited areas were less crucial ones such as the bodywork and interior trim. There were a smaller number of issues with the air-con, gearbox/clutch and non-engine electrics. Two-thirds of the faulty cars were in the repair shop for more than a week, and although 96% of work was done under warranty, some owners paid out between £300 and £500.

Read our full Land Rover Discovery review >>


4. Range Rover Sport (2013-present)

Range Rover Sport front three quarters

Reliability rating: 74.2%

The Range Rover Sport is the least dependable luxury SUV. Owners told us that 40% of their cars had gone wrong, a worryingly high proportion of them with engine problems. There were also problems with the bodywork, engine and non-engine electrics, brakes and suspension. A third of cars couldn’t be driven and nearly half took more than a week to repair. The good news is that 98% of them were fixed for free.

Read our full Range Rover Sport review >>


3. Land Rover Discovery Sport (2014-2019)

Land Rover Discovery Sport

Reliability rating: 73.1%

The Discovery Sport is the most unreliable large SUV. A whopping 49% of cars went wrong, with the model chalking up problems in every one of our fault categories. Half of cars could still be driven, but a third took more than a week to put right. While 88% were fixed for free, non-warranty repair bills ranged from less than £50 to £1000.

Read our full Land Rover Discovery Sport review >>


2. Seat Alhambra (2011-2020)

Seat Alhambra

Reliability rating: 70.8%

The Alhmabra may be big and practical, but it's the least robust MPV, according to owners. They told us a third of their vehicles had a problem, with issues covering a wide range of components including the air-con, battery, bodywork, brakes and engine. A quarter of them couldn't be driven, and more than half took longer than a week to put right. Although 82% of repairs were done under warranty, the remaining owners paid between £300 and more then £1500 to get their cars fixed.

Read our full used Seat Alhambra review >>

See how much you could save on a new Seat Alhambra >>


1. Audi A6 (2011-2018)

Audi A6 Avant

Reliability rating: 70.6%

What went wrong? Battery 14%, bodywork 9%, engine 6%, engine electrics 6%, fuel system 6%, non-engine electrics 6%, brakes 3%, exhaust 3%, gearbox/clutch 3%, infotainment/sat-nav 3%

A wide range of problems afflicted the previous-generation Audi A6, including issues with the battery, bodywork, engine, electrics, exhaust, gearbox/clutch and infotainment/sat-nav. Overall, owners told us that nearly a quarter (23%) of their cars had gone wrong. More than half of those cars couldn’t be driven and took more than a week to fix, and although 40% of them were fixed for free, some owners faced bills of more than £1500. That's why the used A6 is the least dependable luxury car, and the most unreliable car in our survey. 

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