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How to use the On-Board Diagnostic (OBD) unit.

Let’s talk about the On-Board Diagnostic unit


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.

How to use the On-Board Diagnostic (OBD) unit.

Bonus! 10 Interesting Volvo Facts

  • In Latin, the word Volvo means: I spin. Today however the nearest meaning is “I roll”.
  • Volvo was founded in 1924. The two founders were Gustav Larsson and Assar Gabrielsson.
  • The ÖV 4 is the first Volvo car. The first car was sell-ready in 1927. The 2-Liter, 4-cilinder car got the nickname: Jakob.
  • Volvo’s very first commercial vehicle was the Type-1 truck. The release year was 1928. In the same year, Volvo released the second car, the Volvo PV 651. Volvo manufactured a total of 1383 of both vehicles in the first year; of which automaker exported 27.
  • This trend saw a sharp rise in 1932 when Volvo released a good amount of 10,000 vehicles, both trucks and cars.
  • The company, however, started making a large-scale profit from the year 1935. The first luxurious car by Volvo was the PV36, which could carry six passengers at a time. The design of this iconic car paved the path for future Volvo cars to come. I came in the market with a price tag of 8,500 Swedish kronor.
  • Volvo touched a landmark in 1941, with the sale of its 50,000th vehicle; this is a unique achievement considering the time when WWII was in full swing.

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Visit The Official Volvo Cars Website


I downloaded the OBD atachment of 1.35 MB. When I reviewed the document, I did not see a listing of codes, only a few codes were noted inside the document. Did I download everything or is there another listing? I saw a code list for a Volvo 850 which had several pages of codes.

Thanks for your help in navigating the site.

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