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Audi A6 1998-2004, S6 2002 and later, allroad 2001 and later, rs6 2003 and later (C5) Intermittent codes p01423 & p01411

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Last Post: Sep 8, 2012 1:05 PM Last Post By: FKH161
pete0621

Posts: 6
Registered: 01/22/08
Intermittent codes p01423 & p01411
Posted: Jan 28, 2008 11:14 AM
au_rg01_on_board_diag , p1423 , p1411
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I've been getting the codes P01423 and P01411 intermittently (low secondary air flow).
After dealing with this for months I've come to these conclusions:
1. All secondary air components including vacuum hoses are okay. The air pump itself functions regularly.

2. The problem seems to be that the computer controlled secondary air solenoid is only activated intermittently.

Any idea on where I can get information on which sensors etc. the computer relies on in order to determine whether or not to activate the solenoid?

Thanks
pete0621

Posts: 6
Registered: 01/22/08
Re: Intermittent codes p01423 & p01411
Posted: Jan 28, 2008 11:29 AM   in response to: pete0621 in response to: pete0621
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Now that I'm awake let me make some corrections to my original post. The codes are P1423 and P1411...... not p01423 & p01411. Also, the car is a 2000 A6 2.7T (APB).
Also I need to ask ... can anyone tell me where the oil temp sensor is located on this engine? The Bentley manual does not reveal the location. I found the thermal oil level sensor on the bottom of the pan, but I unhooked that and it made no difference on the oil temp gauge which occasionally reads too high.
pascualito

Posts: 1
Registered: 09/04/12
Re: Intermittent codes p01423 & p01411
Posted: Sep 4, 2012 6:49 PM   in response to: pete0621 in response to: pete0621
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what part is the code P01411
FKH161

Posts: 7,531
Registered: 12/29/05
Re: Intermittent codes p01423 & p01411
Posted: Sep 8, 2012 1:05 PM   in response to: pascualito in response to: pascualito
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P1411 is Bank 2 flow too low... so focus on items that control air flow to bank 2 (driver side head).

Red circle in below link is what you need to check if you only have a bank 2 code.

If you have a bank 1 code, check the blue circle.

If you have bank 1 & bank 2 code, check the whole system (but it's most likely 1 item, such as the air pump, the fuse, the vacuum control valve for the combi valves etc).

http://fkh161.ca/Audi/SAIcomponents.jpg
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