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Similar issue
I have a 2018 X5 diesel and have been having similar issues--constant low coolant with no leaks detected after probably a dozen pressure tests.
EGR valve was replaced in April, then the main EGR 2 weeks later and then replaced again in June. X5 has been running worse since and coolant issues are worse.
No loss of power, at start, you can feel a shake probably 1 in every 3 starts and white smoke out of the exhaust.
Dealer says main EGR is fine, could be the rear EGR (my mechanic suspects this is the issue). Dealer also identified an EGR sensor temperature fault.
Did replacing the rear EGR solve your problem?
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