i thought mine was a pd its a 2003 150 tdi gti, but the info from here says its a ARL all very confusing ! sorry to hijack your thread !
It is a PD and a ARL.ARL is the engine model 110KW (150bhp)PD stands for Pumpe Duse which means unit injector. Basically it has 4 high pressure fuel pumps (the injectors). Common rail diesels which have one pump, a pressurised common rail and and electric injectors.