RepairPal Certified shops can diagnose and repair your 2005 Ford Crown Victoria. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
OBD II Code P0442 = Evaporative System Malfunction, Small Leak
http://repairpal.com/OBD-II-Code-P0442
OBD II Code P0420 = Catalyst System Efficiency Below Threshold
http://repairpal.com/OBD-II-Code-P0420