1998 Audi A4 Quatro 2.8L Front Fuse Box Diagram 1998 Audi A4 Quatro 2.8L Front Fuse Box Map Fuse Panel Layout Diagram Parts: heated oxygen sensor, crankshaft position sensor, knock sensor, idle air control valve, fuel pressure regulator, engine coolant temperature sensor, evaporative emission canister sensor, EVAP canister purge regulator valve, ground connector.