The Whistler(1998)

Original title: Die 3 aus der Haferstraße

Ogu, a Turkish boy, loves fast motorcycles and his classmate Alexa. Unfortunately for him, when he whistles enthusiastically for Alexa, he accidentally alerts two robbers. Now he himself is suspected of belonging to the gang of thieves. It takes Ogu and his friends some effort to prove his innocence and catch the real robbers.