4001 4002 4003 CODES 4001 4002 4003 DIPSTICK TUBE (6619AF) 20 ENGINE OIL PAN, PUMP, DIPSTICK, PRESSURE REGULATOR, AND OIL COOLER 6619 OEM 6619AF, 6619TF-01 OEM Engines and Accessories (Waterloo) PC1563 in ENGINE, OEM (SERIES 500 DIESEL) 6619