The Pressure Control Valve (PCV) is an essential component in the 2.0 TFSI EA88.3 engines found in models such as the Golf 7 GTI, Golf 7 R, TT Mk3, Leon 3 Cupra, and S3 8V. A malfunctioning PCV can lead to several issues including excessive oil consumption, reduced power, unstable idle, and misfires..