Sir plz i have bs4 3118 truck previous 3 month se 1 fault code 2772 jo k bar bar active ho jaa rha maine 3-4 bar cilabration krwaya 50-100km thik chalta hai then firse wahi problem ho jta hai or pickup low ho jata hai mailage v khrab ho jata DEF to barabar le rha... Plz sir bhut preshan hun kiya solution hai iske?