The Check Engine Light may illuminate due to throttle valve related fault codes. The repair is to replace the appropriate connectors, if the problem persists the throttle body should be replaced.
Car Problem Reports
Volkswagen GTI Check Engine Light due to throttle body fault codes
Volkswagen GTI Problem
Visitor, 2008 Volkswagen GTI
Engine light came on, dealer replaced throttle body and some wiring. Week later Engine light went on again. Dealer replacing throttle body. Doesn't seem like the route of the problem is being fixed