Chemboy14

Hello all. Im a new D3 A8 owner and have a couple problems that I just can not solve. I received two errors for "Bank 1, secondary air system, flow too low- lower limit not reached" and "Bank , secondary air system, flow too low- lower limit not reached" with DTCs of 17831 and 17819, respectively. I happened to notice this line was broken and hiding behind the engine. I cannot find out what it connects to or how to repair it. Any help?

Chemboy14

Well?

SaltyIrishman

Search for SAI ports or SAI Injection --It's a tiny stupid emissions thing that only runs when the car is cold but will throw a CEL and thus you won't be able to pass inspection.

Pothole5000

If you have VCDS or access to it there are several output tests to determine if it is the pump or something else faulty.


I just put a new pump in my 04 A4 (120k miles)

Chemboy14

If you look at the top of the second picture, you see a vacuum hose that's broken. Does anyone know where it goes to?

Mister Bally

That rubber hose connects to a small diameter synflex tube that goes under the fuel rails on that side of the engin which goes under the front engine decorative cover. It connects to a Tee on the opposite front side of the engine. The tee has two rubber hoses that connect to the two servos there which control the intake manifold flaps.

Chemboy14

Would that be #23? And thats located in the back underneath the PCV?

Chemboy14

I know where it connects in the front, but where does it connect in the back?