× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network

P0491 Diagnostic Trouble Code Discussion for March 2015

Secondary AIR System Insufficient Flow Detected (Bank 1)

Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0491
Help Request Posted
2007 BMW 328i 3.0L MIL Lamp on VIN: WBAVC53507
P0491: Secondary Air Injection System Insufficient Flow Bank 1. Hello BMW Techs, We have tried multiple things to make this code go away. We checked the hose going to Air Injection valve and it's fine. We tried a different Air Injection pump (used one)with no luck. We installed a new Air Injection Valve and we still have t...
March 24, 2015
2009 Audi Q5 Premium 3.2L MIL Lamp on VIN: WA1KK78R59
P0491: Secondary Air Injection System Insufficient Flow Bank 1. ... Manifold Tuning valve stuck open. We would like to know if these manifolds have internal issues and if anyone has seen anything external cause this code. The second code on the list we are familiar with P0491 Air Injection...
March 26, 2015