Ways to Launch an OBD Code Reader

    1

    Locate the Assembly Line Diagnostic Link (ALDL) under the dashboard from the vehicle, close to the steering wheel . It is a 12- or 16-port electrical outlet that may perhaps have a plastic cover, depending on your car. Click the link within the "References" section below to get a diagram of the ALDL.
    2

    Plug the OBD code reader in to the ALDL port and turn the ignition crucial for the "on" position. Do not crank the engine.
    3

    Follow the prompts on the code reader screen, entering information such as the year, make and model of your car.
    4

    Write down the codes that appear on the diagnostic scanner's view screen, and consult your owner's manual for the code definitions . Go online for code definitions for your specific vehicle if you don't have an owner's manual, or buy a repair manual.