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P0491 Diagnostic Trouble Code Discussion for April 2011

Secondary AIR System Insufficient Flow Detected (Bank 1)

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Trouble Ticket Help Requests for DTC P0491
Help Request Posted
2006 Ford Focus ZXW 2.0L MIL Lamp on VIN: 1FAHP36N97
P0491: Secondary AIR System Insufficient Flow Detected (Bank 1). I checked the relay,had my power and ground. I checked the air valve when i put vacuum to it to make sure it opens and closes.It work fine. I jumped the air injection bypass solenoid to make sure it worked. I jump the relay to the air pump and the pump ran.I t...
April 19, 2011