OBD unit is in the engine compartment
The Volvo 240, 740, 760, 780, 940 and 960 cars from 1989, non-turbo engines only and 1990 to 1995 for both turbo and non-turbo engines were fitted with an On-Board Diagnostic (OBD) unit in the engine compartment. It is mounted behind the left strut assembly and can be used to check for Diagnostic Trouble Codes (DTC), more commonly known as fault codes, in both fuel injection and ignition systems.
This tool is a first step in diagnosing engine problems. Unlike the later models you do not need a scan tool to read the codes.