After repairs, you must clear the codes manually:
Some late-model Volvo 940s (specifically 1995 and some 1996 models, often Turbo models) were equipped with the or modified Motronic 4.3/4.4 systems. If the vehicle has a single ECU managing both fuel and ignition, the diagnostic unit in the engine bay might be OBD-II compliant . felkoder volvo 940