SECONDARY AIR INJECTION CODES AFTER ENGINE SWAP

2016 AUDI A3
95,000 MILES • 2.0L • TURBO • 4WD • AUTOMATIC
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BHAMDOC1
  • MEMBER
  • 303 POSTS
I did not unplug the harness on the air pump under the bumper, just put it aside after I removed the two tubes from engine. Connected them back. Is it possible it is due to the fact that the intercooler is not yet connected so the air isn't like or where it should be or the amount is different? Don't worry about the cam code that was because I forgot it unplugged/ So I have 2 secondary air codes, the ambient temp cause it is unplugged, cooling fan cause it is unplugged still, and the one that am not sure why it is there the intake manifold runner control stuck closed, don't know what it means or where to look
Aug 17, 2026 at 12:03 PM
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BHAMDOC1
  • MEMBER
  • 303 POSTS
Edit: only thing I found was that the hose/tube to the brake booster was not connected to the booster so just did, can't tell yet till I run it for a while,, but don't wanna do that till I attach everything back and add coolant. I also found the little vac hose that comes from underneath the intake and goes to either the air filter box or the tube it connects to. can't tell where it goes as it's aftermarket, but it fits on both nipples.
Aug 17, 2026 at 1:31 PM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,236 POSTS
Hi:

It lookes like it perfectly aligns with the air induction tube. Where is the other location? Is the hose coming from the intake manifold?

I attached two pics of EVAP schematics. Can you identify the hose you are dealing with?

Let me know.

Joe

See pics below
Aug 17, 2026 at 8:16 PM
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