Hello,
i have Audi a4 1.8 turbo 2001.

i got check engine, scan it and got the following code:
16795- secondary air injection system: incorrect flow detected.

17887- boost vacuum system: mechanical failure.

i toke it to my mechanic but he cant fix it.
i have a hose that he can't find were to connect...

and we can't find this vacuum reservoir does someone know were is it?
or were can i find a diagram of it's location.

Please HELP

thanks,
kobi

 

My car had the same 2 codes when I sold it.
My mechanic used a smoke generator to locate
leaks. He replaced a three-way valve for the brakes,
and a hose for the secondary air system. The codes
kept comming back every 10 days. I reset the CEL
with a code reader and passed inspection. The car
ran well, so I never tried additional repairs.

 

www.alldatadiy.com

 

The hose he probably has found is for the sai. They get brittle and break. The sai is located under the engine bay, passenger side in the front. You will find a vacuum cleaner type pump, follow input and output. If it is broken it could deffently be the reason for the incorrect flow.