Least reliable executive cars

The best executive cars aren't only refined, efficient and packed with technology, they're reliable too. We reveal the most and least dependable...

Audi A4 35 TDI Sport S tronic

The three least reliable executive cars

3. Audi A4 diesel (2015-present)

Score 89.8%

Diesel versions of Audi’s executive saloon were marginally less dependable than petrol versions, with 24% of them going wrong, compared with 21% of petrols. The battery was the biggest issue, followed by non-engine electrics, and then the bodywork, brakes and suspension. Although most cars could still be driven, a third took more than a week to fix; 80% of work was done under warranty and only a small percentage of owners paid out £1500 or more.

Read our full Audi A4 review >>

Find Audi A4 deals >>

2. Vauxhall Insignia Grand Sport (2017-present)

Vauxhall Insignia Grand Sport

Score 87.4%

A quarter of Insignia owners reported a fault on their car, with the gearbox/clutch causing the most concern. Other problem areas included the bodywork, engine, engine and non-engine electrics and the suspension. Nearly half of the cars couldn’t be driven and were out of action for more than a week. Thankfully, four out of five were fixed for free.

Mercedes C-Class front three quarters

Score 87.3%

What went wrong? Non-engine electrics 11%, exhaust 6%, fuel system 4%, battery 3%, bodywork 3%, infotainment/sat-nav 3%, brakes 2%, steering 2%, engine 1%, gearbox/clutch 1%, interior trim 1%

A third of C-Classes went wrong, according to owners, who reported a wide range of issues. Faults rendered more than a third of cars undriveable, and one in four was off the road for more than a week. Although 81% of cars were fixed for free, a small percentage of owners paid out more than £1500 in repair bills.

Owner’s view “This is the worst car I have ever bought. Faults haven’t been properly fixed and the service from the dealer has been poor”

Read our full Mercedes C-Class review >>

Find Mercedes C-Class deals >>

The 2021 What Car? Reliability Survey is open; tell us about your car here

For all the latest reviews, advice and new car deals, sign up to the What Car? newsletter here

<< Previous | Next: Tell us about your car in the What Car? Reliability Survey  >>

Page 2 of 2