Unveiling the Secrets of P0491 The Ultimate Guide

Sounds like a carbon build up issue in which case the car is safe to drive. You may have a problem when you come to your next emissions test but you can fix it ... The car will need to be in closed loop or hot for the 02 sensors to read the air input correctly. I bought this for my 2003 E46 BMW 325xi to fix the check engine light for code P0491 and P0492 which showed an error on the secondary air injection. Diagnose ... The ODBII code P0491 indicates a malfunction in the secondary air injection system for bank 2, which is responsible for reducing emissions during cold ... The OBD-II fault code P0491 means that the Secondary Air Injection System is not providing enough airflow into the exhaust system during ... My '07 Cayman presented engine codes P0491 and P0492 which are associated with the secondary air system. P0491 code means there is a problem on the side of the engine which contains cylinder #1 due to a bad air inlet, faulty wires, relay, pump, or fuse. It's code p0491 -- Secondary air pump, bank1. From what I've read it could be the bank 1 valve and/or the hoses that run under the manifold. The code it's showing is p0491: Secondary Air Injection System Insufficient Flow Bank 1. The thing is, I'm fairly certain that I do not have SAI. I got the following two codes: The first one (store trouble codes) P0491 (secondary air injection system insufficient flow bank 1) I did ...