Freddy90

Hi all, After driving audi for years I've finally got myself a VW Tiguan today. When I put the key in all the lights flash on dashboard as usual however the Amber engine light stays on until I turn on the engine and then it goes away. This only started after filled it with diesel about (half the tank) later today. Before that it was not there. I read something that it might be the fuel cap but it is back on tight. Is this something that needs addressing? As I am new to VW.