oil in throttle body c220 cdi

[magentalic]

my 2004 c220 cdi has just blown the air pipe below the throttle body off at the joint.there is a fair amount of oil dripping from the body itself and down the pipes anyone any idea where it will be from.also the engine management light came on and when plugged in to a obd,code 2025 it said pressure between b28/5 and n3/9 is implausible.
also code 2079 purge control dpf engine protection is active.diff.presure;valve above limit. help appreciated