DTC P0420: Catalyst System Efficiency Below Threshold - Bank 1 Or DTC P0430: Catalyst System Efficiency Below Threshold - Bank 2: Notes
WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Before performing diagnostic procedure, follow testing procedure. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM.
NOTE:
DTC P0430 is for 3.5L only