Test requirements

WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2006 Volkswagen GTI, 2005 Volkswagen Jetta, 2005 Volkswagen GTI, 2004 Volkswagen Jetta, and 2004 Volkswagen GTI. However, it is still accessible from the selected car via links, so may be relevant.

Knock sensor securing bolt tightened to 20 Nm.
On Board Diagnostic (OBD) must have recognized a malfunction at one or both of the Knock Sensors (KS).
Ignition switched off.