Diagnostic code p0420 nissan altima 2004-2006 Nissan Altima Factory Service - Auto … Nissan Bulletins are intended for DESCRIPTION PFP OP CODE SYM DIA FRT DTC P0420 Diagnosis Select vehicle model and model year (Example: Altima... Source Source Source Source Source Source Source Source Source Source Read Also: Trouble code p0420 nissan altima Nissan diagnostic codes p0420 Nissan trouble code p0420 2006 Nissan altima code p0420 2003 Nissan altima code p0420 Nissan altima code p0420