Nissan trouble code p0420 2004-2006 Nissan Altima Factory Service - Auto … MIL ‘ON’ WITH DTC P0420: Nissan Bulletins are intended for use by qualified technicians, DESCRIPTION PFP OP CODE SYM DIA FRT DTC P0420 Diagnosis... Source Source Source Source Source Source Source Source Source Source Read Also: Nissan trouble codes p0420 Trouble code p0420 nissan altima Diagnostic code p0420 nissan altima 2004 Nissan altima trouble code p0420 Nissan altima code p0420 P0420 nissan altima 2006