I had the engine light going on last November. No loss of power or any other mis-behavior of the engine. They did not find a reason why the light went on.
Finally I got a new ECU as the car was still under warranty.
Similar to the Austrian dealer thought it was oxygen sensors, the fix did not last till I got home. Ran it for 2 months with the light on with no apparent loss of performance. Back at the dealer it eventually turned out to be the ECU which was changed under warranty.
