2020 What Car? Reliability Survey: coupés, convertibles and sports cars

In our exhaustive annual survey, we reveal how dependable cars up to five years old are, based on the experiences of 13,000 owners...

2014 BMW 2 Series revealed

Most reliable coupés, convertibles and sports cars

=1. BMW 2 Series Coupé/Convertible (2014-present)

Reliability rating 97.4%

What went wrong? Bodywork 7% non-engine electrics 3%

Just 13% of two-door 2 Series models went wrong. Bodywork was the biggest cause for complaint, then non-engine electrics and suspension. All remained driveable, but three-quarters of them took more than a week to fix. All work was done under warranty, though.

Owner’s view "My car is reliable and feels well built, and I've been well looked after by the dealer's service department"


=1. Volkswagen Arteon (2017-present)

Volkswagen Arteon front three quarters

Reliability rating 97.4%

What went wrong? Exhaust 7%

A mere 7% of Arteons went wrong, according to owners, but those that did couldn't be driven and took more than a week to put right. However, all work was carried out for free, keeping owners happy.

Owner’s view "The thing I like best about my car is its reliability. I've had no niggles or issues with it in the past two years"

BMW 4 Series Convertible

 Reliability rating 95.3%

Faults were reported by 19% of owners; the exhaust was the main area of concern, followed by the bodywork, gearbox/clutch and steering. Virtually all cars could still be driven and four out of five were repaired in less than a week. Although 86% of work was done under warranty, some owners paid out between £100 and £750.


Least reliable coupés, convertibles and sports cars

1. Porsche 718 Cayman/Boxster (2016-present)

Porsche Cayman T front

Reliability rating 82.5%

What went wrong? Air-con 10%, engine 10%, engine electrics 10%, non-engine electrics 5%, interior trim 5% 

Owners reported that 25% of their cars had suffered a fault, and a worrying 10% of those were with the engine. More than a third were rendered undriveable and a quarter spent more than a week in the workshop being fixed. Only 63% of work was done for free, leaving owners to pick up bills ranging from £300 to more than £1500.

Owner’s view "The thing I like least about my car is its poor reliability. It's had two engine problems and it's only three years old"


 2. Porsche Panamera (2016-present)

Porsche Panamera 4 E-Hybrid

Reliability rating 84.5%

A disappointing 47% of Panameras suffered faults, and almost half of those were to do with the bodywork. Other problematic areas included the air-con, brakes, engine, exhaust and interior trim. All of the faulty cars could still be driven, and the majority were fixed in less than a week. While most work was done under warranty, some owners paid between £50 and £1000.


3. Porsche 911 (2012-present)

Used Porsche 911 2012-present

Reliability rating 90.1%

Overall, owners of 911s reported faults in 36% of cases, with the main area of concern – as with the Panamera – being the bodywork (21%). Engine electrics and the exhaust were the only other trouble spots. Most of the cars could still be driven and two-thirds were back on the road in a week or less. More than 80% of repairs were done for free, but a small percentage of owners paid out £100 to £200.


Reliability for coupés, convertibles and sports cars aged up to five years old

Rank Make and model Score
1= BMW 2 Series Coupé/Convertible 2014-on 97.4%
1= Volkswagen Arteon 2017-on 97.4%
3. BMW 4 Series Coupé/Convertible 2014-on 95.3%
5= BMW 4 Series Gran Coupé 2015-on 94.6%
5= Audi A5 2016-on 94.6%
6. Audi TT 2015-on 94.1%
7. Mazda MX-5 2015-on 93.3%
8. Porsche 911 2012-on 90.1%
9. Porsche Panamera 2016-on 84.5%
10. Porsche 718 Cayman/Boxster 2016-on 82.5%

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