People, With my Smart Fortwo 451 bj 2009 km 122000 today the yellow control light approached. Although it drives normally also normal accelerated etc I wanted to know by a few smart experts what this could be about?! He has paper-based 61ps, however, has chipped it for two years on about 75 ps. Also runs flawlessly. Checkbook maintained means maintenance is done properly. Oil does not consume so much. Thanks in advance for the next answers and possibly helpful comments