Possible causes – IACV-AAC valve harness is open or shorted– IACV-AAC valve poor electrical connection– Faulty IACV-AAC valve Tech description There is a factory service bulletin for the following Lincoln Models: 2005-2007 Town Car2006 Mark LTLincoln Factory Service Bulletin OBDII Code P0505 When is the obd code mean? The P0505 code is set when the…