P0491 and P0492??

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07-21-2007, 02:43 PM

tjolson19

1st Gear

Thread Starter

Join Date: Apr 2006

Location: Littleton, CO

Posts: 75

P0491 and P0492??

Got these codes saying Secondary Air System bak 1 and bank 2? What could this be? I had them reset and the CEL hasn't come back on yet....?

07-22-2007, 12:17 AM

CRAZYHAWK

4th Gear

Join Date: May 2004

Location: Northern NJ USA

Posts: 4,078

RE: P0491 and P0492??

Bentley Publishers doesn't list those codes. Lets hope they
don't return.

07-22-2007, 09:07 AM

theguy1084

1st Gear

Join Date: Jun 2006

Location:

Posts: 434

RE: P0491 and P0492??

could be a combi valve or the vacuum lines to the valves. Do you hear the pump running after start up(sounds like a hair dryer). If the engine is already hot enough though you will not hear it run

07-22-2007, 12:11 PM

96audia4

Senior Member

Join Date: May 2006

Location: Townsend, MA

Posts: 607

RE: P0491 and P0492??

This is a picture of the secondary air injection pump. You might want to check the hoses for any leaks.

[IMG]local://upfiles/18457/4C1472AF8F5D45BEBF4FC73745E9D577.jpg[/IMG]