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Are you still taking it to dealer because it is under CPO warranty?
If not, stop talking to those idiots unless you have a verifiable warranty claim.
It looks like you are pretty leavel-headed, judging by your comments about deleting and egr valve itself.
Do you have any scanner to read BMW specific codes?
At the very least, can you ask the dealer to give you codes they pulled?
EGR valve acting up is most likely due to oil getting into its electronics side.
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