P0411 Secondary Air Injection System Code SOLVED! - AudiWorld Forums

Go Back   AudiWorld Forums > Audi Models > Audi TT / TT-S / TT-RS > TT (Mk1) Discussion
Log In 

TT (Mk1) Discussion Discussion forum for the Mk1 Audi TT Coupe & Roadster produced from 2000-2006

P0411 Secondary Air Injection System Code SOLVED!

LinkBack Thread Tools Search this Thread
Old 06-02-2008, 09:10 AM   #1
Junior Member
Join Date: Apr 2003
Posts: 734
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.

'01 TTQC 225
Black, Grey
APR Stock, 93, Valet, 100 Race
Milltek Resonated Hi-Flo Catback 100 mm tips
Forge DV-R--Blue Spring
AWE Vent Boost Gauge
TTDA'ed, ****'ed, 4 Bar FPR'ed, and Boost Machine'ed
18x8.5 Kosei K3 Silver
Falken Azenis ST115 245/40-18 Rear, 235/40-18 front
GoTToGo is offline   Reply With Quote
Old 06-02-2008, 09:28 AM   #2
Join Date: May 2002
Posts: 15,536

Cool! Great trouble-shooting!!
418 all wheel pony burnination.
AxeYrCat is offline   Reply With Quote
Old 06-02-2008, 11:05 AM   #3
AudiWorld Senior Member
Join Date: Aug 2002
Posts: 1,112

Way to stick with it!
2002 180 QC Denim Blue (in order of install)
OEM Roof Rack, Forge DVR, REVO SPS1,
TTDA, Seat Delete
Stock 225 exhaust, 3.2 rear valance
17" RS4 replicas, Neuspeed 19 mm rear sway bar, de-vaned and de-screened maf.
cedricl is offline   Reply With Quote

2005, a4, air, audi, code, detected, flow, hose, incorrect, p0411, po411, secondary, solved, troubleshooting, tt, vw

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -8. The time now is 01:28 AM.

Copyright 2014 AudiWorld.com Audi Enthusiast Community