How can you read codes on a 1995 Lincoln mark 8?

To read codes on a 1995 Lincoln Mark VIII, you can use an OBD-I scanner, as this vehicle is equipped with the On-Board Diagnostics system version I. Locate the diagnostic connector under the dash near the driver's side, and plug in the scanner. Turn the ignition to the "On" position (without starting the engine) and follow the scanner's instructions to retrieve the trouble codes. Alternatively, you can use the "Key On, Engine Off" method by turning the ignition key on and off several times, which will cause the "Check Engine" light to flash the codes on the dashboard.