Thousands of drivers with cars less than 12 months have been quizzed by the Auto Express Driver Power survey across 31 different categories.
BMW’s 5 Series ranked worst with a 51 per cent of owners claiming to have suffered a problem in the last 12 months.
36 per cent of new 4 series owners reported issues while the 2 Series and 3 Series also ranked poorly at 35 per cent and 31 per cent respectively.
Complaints were spread across paint and trim, electrics, engine, suspension and brakes.
For all the cars rated, the failure rate was 14 per cent with one in seven drivers having a problem with their new car.
The Peugeot 2008 was recognised as the best performer with no drivers taking it back to the garage in the last year.
Also impressing drivers with reliability, the Nissan Juke (two per cent) and Mercedes A-Class (three per cent).
New cars most likely to develop faults
|1||BMW 5 Series/M5||51 per cent||Exterior paint and trim|
|2||Alfa Romeo Giulia||40 per cent||Electrics|
|3||BMW 4 Series/M4||36 per cent||Electrics, suspension and brakes|
|4||BMW 2 Series/M2||35 per cent||Suspension|
|5||Land Rover Discovery Sport||31 per cent||Engine|
|6||BMW 3 Series/M3||31 per cent||Engine|
|7||Toyota C-HR||29 per cent||Exterior paint and trim|
|8||Citroen C4 Cactus||29 per cent||Engine, exterior paint and trim|
|9||Audi A4/RS4/S4||28 per cent||Exterior paint and trim|
|10||Dacia Sandero/Stepway||24 per cent||Electrics|