indication of code PO420 on 2005 F150 5.4Lit. eng.

Question

I need explanation of code P0420 on my Ford F150 / 2005/ 5.4 engine

Answer 1

P0420 Cataltyic below efficiency Bank 1

 Here a catalytic that was recently replaced on a Ford with a 5.4 engine, what happen here was a misfire condition that was ignored and as a end result it damage the catalytic convertor. This would be one typical devestation to a catalytic convertor. The main purpose of the CK ENG LT is to protect the catalytic convertor and the catalytic is to protect the enviroment.