Haz Posted August 26 Report Share Posted August 26 From the Edge-Nautilus 2.0L EcoBoost Workshop Manual, regarding the P0420 Diagnostic Trouble Code (DTC)... Placing your device cursor over underlined acronyms may yield pop-up full-words descriptions of the acronyms. DTC Fault Trigger Conditions DTC Description Fault Trigger Condition PCM P0420:00 Catalyst System Efficiency Below Threshold Bank 1: No Sub Type Information Sets when PCM detects the bank 1 catalyst system efficiency is below the acceptable threshold. Under normal closed loop fuel conditions, high efficiency catalysts have oxygen storage capability. As catalyst efficiency deteriorates, its ability to store oxygen declines. Refer to the Catalyst Efficiency Monitor description for additional information. Diagnose any base engine concerns. Refer to the appropriate 303-00 section, Engine System. Possible Causes HO2S 2WD 4WD circuitry concern Exhaust system concern Contaminated oil Base engine concern Fuel injector Turbocharger HO2S 4 Quote Link to comment Share on other sites More sharing options...
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