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P0411 Secondary Air Injection System Code SOLVED!

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Old 06-02-2008, 09:10 AM
  #1
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Default P0411 Secondary Air Injection System Code SOLVED!

For a very long time I have had the infamous secondary air injection code thrown...
************************************************** ****
16795 - Secondary Air Injection System: Incorrect Flow Detected
P0411 - 35-10 - - - Intermittent
************************************************** ****
I replaced the secondary air injection solenoid valve (n112) leading to the secondary air pump--it actually was not bad b/c the old one did read the correct resistance (25 to 35 ohms). I replaced the secondary air injection pump--it was bad, the rivets holding it together had given way and air would rush out on start up. I pressure tested the system. I smoke tested the system. It held boost fine. But after resetting the code, it would come back after about 30 miles. This went on for nearly a year.

I did not give up.

The problem was found by actually disconnecting hose after hose and blowing smoke down them until we found the culprit. It was the vacuum hose shown in the picture. The hose had broken where it runs down under the manifold, and due to the closed one-way valve it comes off from, conventional smoke testing does not find it. The hose was replaced, and no more code being thrown.

<img src="http://www.epsthree.com/audi_pics/vacuum_hose.jpg">
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Old 06-02-2008, 09:28 AM
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Cool! Great trouble-shooting!!
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Old 06-02-2008, 11:05 AM
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Way to stick with it!
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