Engine Controls - DTC P0420 Stored In ECM: Overview
Classification: EC10-014Reference: NTB10-083
Date: July 8, 2010
2005 - 2006 ALTIMA WITH QR25DE ENGINE AND 50 STATE EMISSIONS; MIL ON WITH DTC P0420
APPLIED VEHICLE: 2005-2006 Altima (L31)
APPLIED ENGINE:
QR25DE* Engine Only
* 50 State emission specification ONLY
IF YOU CONFIRM:
DTC P0420 (Catalyst System Efficiency Below Threshold) is stored in the ECM.
ACTION:
Determine if this bulletin applies by checking the ECM Part Number.
^ You will do this by performing Step A in the SERVICE PROCEDURE.
If this bulletin applies, reprogram the ECM and perform P0420 DTC Confirmation.
^ You will perform Step B and C in the SERVICE PROCEDURE.
If this bulletin does not apply, refer back to ASIST and the Electronic Service Manual (ESM) for further diagnostic and repair information.
IMPORTANT:
The purpose of ACTION (above) is to give you a quick idea of the work you will be performing. You MUST closely follow the entire Service Procedure as it contains information that is essential to successfully completing this repair.
CLAIMS INFORMATION