Specified Values
WARNING: This page is about a different car, the 2014 Volkswagen Touareg, 2013 Volkswagen Touareg, 2012 Volkswagen Touareg, and 2011 Volkswagen Touareg. However, it is still accessible from the selected car via links, so may be relevant.
High-Pressure Side:
Increasing from pressure with engine not running to a maximum of 20 bar (290 psi).
Low-Pressure Side:
Decreasing from pressure with engine not running down to 1.3 bar (18.9 psi).