The white plastic bung thing that is on small black pipe at the back of the egr. I will try and try a photo but maybe some will know what it is and what it is for. Mine is missing. I might put a small bolt or something in but would rather have the proper thing.
What year? for maybe 2010~2011 only that’s likely the engine coolant air vent. Commencing 2012 they nixed the vent function, mod’d that junction, kept mostly the same (it still serves as a junction) but it’s no longer a vent, white cap is gone. You used to unscrew that cap, allowed air to escape during coolant fill.
