Go Back  AudiForums.com > Audi Models > Audi A4 > B6 Models
P0411 Secondary Air Injection System Incorrect Flow Detected >

P0411 Secondary Air Injection System Incorrect Flow Detected

B6 Models Please discuss all 2002 - 2005 B6 A4 topics here...

P0411 Secondary Air Injection System Incorrect Flow Detected

  #1  
Old 05-02-2013, 04:55 PM
1st Gear
Thread Starter
Join Date: Jan 2011
Posts: 23
Default P0411 Secondary Air Injection System Incorrect *solved*

Hello everyone, 04 A4 B6

I am just about to go insane with this issue, cant pass my emission test because of this. So far I have replaced all the vacuum lines to ensure there is no leaks. I have changed the n80 valve ( I put the b7 one instead of the b6 one )
Everything I try leads me back to this issue. Latest try I cleared the codes waited for the systems to go ready, for about 5 days it showed no errors, but just today the check engine light isnt on yet but it showed the code.

The only thing I havent done is change the relay in the ecu box regarding the SAI.
What am I missing here?

Also which way does the one way valve and the n80 valve flow?
Any help would be great
 

Last edited by jafferman; 05-06-2013 at 03:29 PM.
  #2  
Old 05-02-2013, 07:03 PM
2nd Gear
Join Date: Mar 2012
Location: Hellertown, Pennsylvania
Posts: 550
Default

I'm not 100% certain here, but I think you're looking for the n112 solenoid. Maybe another member can either confirm or deny this.
 
  #3  
Old 05-02-2013, 07:18 PM
1st Gear
Thread Starter
Join Date: Jan 2011
Posts: 23
Default

I definitely haven't checked that or the relay j299. Water did get into my ecu box a while ago, also when I cold start I do hear the sai for slightly over a minute then then rpms idle down. So would that eliminate the relay?
 
  #4  
Old 05-02-2013, 10:34 PM
2nd Gear
Join Date: Mar 2012
Location: Hellertown, Pennsylvania
Posts: 550
Default

If it's starting when you first turn on your car in the morning then I'd say the relay is good. You should certainly hear it when it first turns on as you'll notice the noise coming from the engine bay changes after about a minute and a half when the cats are heated up.

You could have a kombi valve that's on its way out as well. I would pull up the codes again and see if it's from bank 1 or bank 2. Once you know that you can narrow your search down to a particular side.
 
  #5  
Old 05-02-2013, 11:33 PM
1st Gear
Join Date: Jan 2007
Location: western NJ
Posts: 460
Default

This worked for my 1.8. check the discharge line from the air pump up to the metal pipe for leaks. that metal pipe goes to the combi valve and that pipe has rubber elbows in it that rot. At cold start, remove the vac line from the combi valve nipple and see if vacuum is present in the line, by letting it suck your thumb. If vac is there, then your combi may be bad. remove the combi and suck on the nipple to see if it actuates.

I guess you have two of everything I just mentioned.
 
  #6  
Old 05-05-2013, 09:58 PM
1st Gear
Thread Starter
Join Date: Jan 2011
Posts: 23
Default

Just to give an update, ended up paying for vagcom, here's the code


VCDS-Lite Version: Release 1.2

Control Module Part Number:

Component and/or Version: 1.8L R4/5VT G 0003



1 Fault Found:

16795 - Secondary Air Injection System: Incorrect Flow Detected

P0411 - 002 - Lower Limit Exceeded

-------------------------------------------------------------------------

So I ran output test

my n80 was clicking, n112 was clicking then i heard this plunger sucking sound coming from the n112 and nothing else.

on the j299 relay test i only hear clicking (dont hear the pump coming on, from what i read i should hear the air pump cycling?)

So i decided to pull out the ecu box next to the battery and the contacts j299 relay was green and salty looking and looks like water got into the ecu box before.
Would the relay click and not cycle the air pump if it was on its way out?

When I do cold start my rpm goes to 1300 rpm then drops a minute or so after. the car engine sounds louder for sure where could i listen to to hear if the sai is turning on?

I will remove the lines from the combi valve to see if it can replicate the conditions.
 

Last edited by jafferman; 05-05-2013 at 10:05 PM.
  #7  
Old 05-05-2013, 10:14 PM
1st Gear
Join Date: Feb 2013
Location: San Antonio, TX
Posts: 231
Default

id just slip the dude 100 bucks and ask for it to pass... works 100%, 80% of the time...

just grow a mustache they wont be able to say no.

besides secondary airpump is a joke it literaly works for like 2 sec when you start the car....thats it.
 
  #8  
Old 05-05-2013, 10:36 PM
1st Gear
Thread Starter
Join Date: Jan 2011
Posts: 23
Default

Originally Posted by Expplucky View Post
id just slip the dude 100 bucks and ask for it to pass... works 100%, 80% of the time...

just grow a mustache they wont be able to say no.

besides secondary airpump is a joke it literaly works for like 2 sec when you start the car....thats it.
Unfortunately they changed the system here this year and you can only pass once it's plugged into your obd slot so I can't even take that option lol for cars newer then 2001
 
  #9  
Old 05-06-2013, 11:32 AM
1st Gear
Thread Starter
Join Date: Jan 2011
Posts: 23
Default

Does the relay trigger the air pump? Should it cycle when I output test the relay? So is my relay gone?
 
  #10  
Old 05-06-2013, 03:26 PM
1st Gear
Thread Starter
Join Date: Jan 2011
Posts: 23
Default

Ended up buying a relay and it worked pump was cycling in the out put test, just waiting for the oxygen sensor heating system to go ready then I can finally pass it
 

Thread Tools
Search this Thread
Quick Reply: P0411 Secondary Air Injection System Incorrect Flow Detected


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.