Join Now
International Automotive Technicians Network

P0491 Diagnostic Trouble Code Discussion for July 2014

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
2002 Volkswagen Passat GLS 2.8L MIL Lamp on
Air pump will not activate.I do not have a factory tool to activate.My Autel and Launch do not have the capability.The large 40 amp fuse in the engine compartment is not blown.The relay next to it(when I remove it ) I can make it click remotely.If I send curre...
July 21, 2014