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The DTC (Diagnostic Trouble Code) connector would be located under the drivers side of the dash. Plug the scanner into the DTC connector and then follow directions that came with your scan tool.
Trouble code P0505 means: Idle Air Control System
Trouble code P0171 means: Fuel Trim Lean (Bank 1)
The 1998 Lincoln Continental OBD 2 port is under driver side dash next to center console
Trouble code P0505 means:Idle control system malfunction
That would be a OBD II system. You need a code scanner to read the codes.
DTC 54 Fuel pump low voltage
Code 22 means: VTEC Pressure Switch
Jump pins marked "D" and "F" for code retrieval.
Dtc #0418
DTC # IS 0262
Troublecode P1490 means: EVAP Vacuum Cut Valve Bypass Valve Circuit Malfunction