My w204 is kicking into limp mode at various points, usually when trying to build speed or uphill. The gearbox kickdown is slow and sluggish. The engine light shows egr issues, and an injector with issues. After clearing a few times the injector persists and the egr hit and miss. Also, the engine fan is full blast from turn over and never stops. I'm guessing this is an AC sensor after reading some forums.. Ill put that on also, give it new filters and oil and see if really need new injectors... I hope not Getting new egr in next few days, will try it let you know if it improves.