The boy fled after a reported row with his parents in Italy.
Having driven from Italy into Austria, he proceeded to Germany where he was stopped by police after his family had alerted Interpol.
The boy, who had been adopted two years ago, was reportedly heading to his original home country, Poland.
The teenager lives in the northern Italian town of Montebelluna.
After an argument with his adoptive mother – allegedly over a mobile phone payment – the boy, a keen go-cart racer, left on Thursday afternoon.
And he seems to have been completely confident at the wheel of his father’s high-powered Mercedes car.
His parents say he was probably heading for Poland – he was said to be missing his sister who lives there and to have been in touch with her via the internet, according to Italian media.
The car was eventually tracked and stopped near Moisburg, about 150 km from the Polish border.
Police said it was “incredible” that the boy-driver had managed to cross two international borders and filled up with petrol twice without anyone en route raising the alarm.
The teenager’s parents are understood to have gone to Germany to bring him home.
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