Hi 36 is EGR Control-Back pressure transducer. 73 not in my list. 86 is ECR solenoid malfunction. 15 says Fuel quantity adjuster position sensor malfunction, so think as two are re the EGR this could be your problem area, think for the moment I would disregard 15, but as this is a 3 it may not correspond completely to the older codes, Rayf is your man on this one, Rick