This is super common on the 3.0T/2.9T. The evap pressure sensor is inside the heat wrap on the passenger side of the turbos, just snap open the silver wrap and you'll see the sensor. They fail frequently and Audi has a new revised part number for them. It's a bit tough to see but it's #4 on the diagram (different from the MAP sensor, which has nothing to do with emissions):
s6 2.9 SENSORS.png
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