hello,

my 2006 A3 SI is giving me the MIL light and a Code 171.

i'm under the impression that it can be a vacuum leak.

whats a good way to test for the leak? i can't hear anything amiss.
does anyone know how or where to get a tear-down manual for this car?

does anyone have a drawing of the vacuum system?

it's winter here, and i've had other vehicles give me seasonal issues with sensors.
could it be this?

thanks.