What Car? Reliability Survey: Most and least reliable coupés, convertibles and sports cars (2024)

Reliability rating 83.0%

What went wrong? Battery 9%, bodywork 9%, non-engine electrics 6%, air-con 3%, brakes 3%, fuel system 3%

The 2014-2020 BMW 4 Series isn’t particularly prone to problems, but when they do occur, they can be pricey and slow to fix. BMW covered the cost of only 42% of repairs, leaving nearly half the owners with bills of up to £1500 and 8% paying more than that. Overall, 21% of cars went wrong, and while 42% were fixed in a day or less, 50% took more than a week to put right. As well as the coupéversion, the figures cover the 2014-2020 BMW 4 Series Convertible.

Owner’s view“I’ve spent more than £3000 in the past year due to a coolant leak and resultant damage to the wiring harness – very disappointing.”

2. VolkswagenArteon(2017-present)

Reliability rating 86.6%

Issues affected 32% of VolkswagenArteon cars reported on for our survey, with the sat-nav/infotainment system playing up in 27% of those. Although Volkswagen covered the cost of 82% of remedial work, 9% of owners had to find more than £1500 to have their cars put right. Around a third of the affected cars were off the road for more than a week.

3. Porsche 911 (2019-present)

Reliability rating 87.3%

Bodywork faults were the main bugbear of Porsche 911 owners, accounting for 25% of all faults. Overall, 33% of 911s had issues, with owners also reporting battery and interior trim faults. Two-thirds took less than a week to fix, but although Porsche paid for 80% of repairs, 20% of owners faced bills over £1500.