00 A6 2.7 Secondary Air pump Issues

gadgetmeister2711 · 07-04-2007, 08:48 PM

Posted this in 2.7 forum, looking for an answer here. Keep getting error code on cold start, Insufficient Air Flow, Bank 1 and Bank 2.
I've gone through the entire system, all parts and hoses are working properly.

THE QUESTION:
Does anyone know what the computer actually monitors to determine if the airflow is sufficient or not? There is no actual sensor in the system, so it must be either cat temperature vs. time or upstream O2 sensor vs downstream O2 sensor comparison. I really don't want to start randomely replacing expensive parts.
Thanks for input.

ub2slw · 08-10-2007, 03:00 PM

here's a picture of the valve on my rs6... my guess is that the hose has deteriorated, like mine and isn't opening the valve...BTW its only for heating the cats faster when the car is cold...it won't affect performance. Check behind the valve covers between the engine and firewall

Vier Glühende Ringe · 11-06-2007, 02:47 PM

reddiamond · 10-27-2008, 08:46 AM

most often it is vacuum problem a smoke machine is very helpfull . if you have access to vagcom activate soleniod and see if you can hear valve move (put a screwdriver on it).also i have opened valve with vacuum pump and activated air pump you should fell air out exhaust. have seen 2.8 cars with pluggrd passages in head

08-10-2007, 03:00 PM	#2
ub2slw AudiWorld Member Garage is empty, add now Join Date: Dec 2004 Posts: 433	check the combi valve here's a picture of the valve on my rs6... my guess is that the hose has deteriorated, like mine and isn't opening the valve...BTW its only for heating the cats faster when the car is cold...it won't affect performance. Check behind the valve covers between the engine and firewall __________________

11-06-2007, 02:47 PM	#3
Vier Glühende Ringe AudiWorld Senior Member Garage is empty, add now Join Date: Nov 2003 Posts: 668	Do you have 15inches of supply vacuum? __________________ Audi Performance Denver at Avalon Motorsports Audi Repair Denver at Avalon Motorsports

10-27-2008, 08:46 AM	#4
reddiamond AudiWorld Member Garage is empty, add now Join Date: Apr 2008 Posts: 145	Re: 00 A6 2.7 Secondary Air pump Issues most often it is vacuum problem a smoke machine is very helpfull . if you have access to vagcom activate soleniod and see if you can hear valve move (put a screwdriver on it).also i have opened valve with vacuum pump and activated air pump you should fell air out exhaust. have seen 2.8 cars with pluggrd passages in head

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10-27-2008, 08:46 AM
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