Hello, again and again I hear that the exhaust gas recirculators are defective with the G 400 CDI. Also with me, the engine was only more to drive in emergency run. I now can repair the parts without removal, a work of about an hour (because now I know how to do it) and saved me the cost of the new part (700 EUR) and the whole work of the exchange! The controllers have a plastic cap behind the back, which is sitting over the mechanics. They can be clipped down, then you can use the mechanics with Aluspray again (there are a lot of soot particles in there, because not everything is as dense as it should be). A few times with the hand moved, and already the part has been fine again. Let’s see how long this is going to work.