DTC P0420 Or DTC P0430: Notes

WARNING: This page is about a different car, the 2002 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

Code Description

DTC P0420: Catalyst System Efficiency Below Threshold - Bank 1
DTC P0430: Catalyst System Efficiency Below Threshold - Bank 2

NOTE: Before performing diagnostic procedure, follow testing procedure. See TESTING PROCEDURE under SELF-DIAGNOSTIC SYSTEM.