Most problems had cars fitted with less powered engines 122 bhp and 140 bhp (BMY engine code) since they had thinner cylinder walls on engine block and less strengthen pistons. Missfire was solved with ECU update somewhere at the end of 2006. 170 bhp model is equipped with BLG engine as well as late 2008 160 bhp model (do not mix with single turbo engine from MK6 and Scirocco).
Some cars have/had problems with electromagnetic supercharger pulley N421 that has integrated clutch and pulley for water pump on it. It is not built/construction problem but just clutch get weaker due time and use and needs replacement. Some owners do not take it seriously and prolong exchange of the pulley and cause greater damage due to poor water circulation through the system.
Brakes same as GTI, driveshafts also, clutch and flywheel same as 2.0 TDI (240m instead od 260mm on GTI) so bit cheaper.
