Volvo Specialist Tool Adapter (20-Pin Diagnostic Adapter) 9511505 Genuine Used. Make – Genuine Volvo. Condition – Used fully working. Allows workshop technicians to connect diagnostic and electrical test equipment (such as multimeters, test lamps, or proprietary Volvo scan tools) to the vehicle’s 20-pin onboard diagnostic socket. Vehicles equipped with the rectangular 20-pin diagnostic connector under the dash, predominantly Volvo models from the 1980s through early 2000s (for example, the 240, 740, 940 and early 850 series). Always verify fitment against the workshop manual or your VIN. If you have any queries, please get in touch and don’t forget to check out my other listings – Thanks.