Diesel Intake Carbon Cleaning. The Service Engine Soon light is on and the engine may run roughly. Possible Fault Codes stored: z 3FF1 air mass sensor z 4595 rough controller Cylinder 6 z 459B rough controller Cylinder 5 z 4592 rough controller Cylinder 4 z 4596 rough controller Cylinder 3 z 4593 rough controller Cylinder 2 z 459C rough controller Cylinder 1 CAUSE Based on the above stored "Fault Code" profile, there is excessive carbon buildup in the intake system.
