[Tyler]

yalymka, вот что пишут на одном зарубежном форуме по поводу этой ошибки:
As far as i'm aware p09f6 is a rail pressure fault during start up. It's quite a common fault on these engines. Are you experiencing longer cranking times? More often than not this fault is stored due to a drop in pressure in the common rail system cause by the failure of 1 or more injectors. Failing injectors will 'leak off' more fuel from the top causing the pressure to drop. From here you need have an injector leak off test carried out whci basically measures the amount of fuel being returned from the top of each injector. Failed injectors will be easily spotted as they will leak of far more fuel than the good ones.

Чаще всего эта ошибка появляется из-за падения давления в системе Common Rail, которое образуется в результате выхода из строя 1 или более форсунок.