Buy a scanning tool that's designed for your make of car, eg Ross-Tech VCDS for VW Group cars.
If you want something for all brands, you're up into workshop money.
If you want something cheap and cheerful, the Torque ELM327 Pro (£12) or Carista Bluetooth OBD2 (£16) - but don't expect perfection.
Edited by RT on 27/10/2018 at 13:37
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