How do you check 1992 Mercury Topaz XR-5 codes?

To check the trouble codes on a 1992 Mercury Topaz XR-5, you need to use an OBD-I diagnostic tool or a paperclip to connect the diagnostic connector pins. Locate the diagnostic connector, usually found near the driver's side under the dashboard. By connecting the appropriate pins, you can trigger the check engine light to flash a series of codes that correspond to specific issues. Make sure to refer to a code chart for interpreting the flashes.