How do i retrieve diagnostic trouble codes from 87 wagon?

To retrieve diagnostic trouble codes (DTCs) from an '87 wagon, you'll typically need to locate the diagnostic connector, which is usually under the dashboard near the steering column. Use a diagnostic scanner or a jumper wire to connect terminals A and B of the connector. Then, turn the ignition to the "On" position without starting the engine; the check engine light will flash a series of codes. Count the flashes to determine the trouble codes, referring to a service manual for specific code meanings.