audi a3 2.0 tdi bkd coolant leak

I have a audi a3 2ltr tdi 2014
Lost all coolent garage replaced egr cooler then a week later lost all coolent again then said header tank leaking replaced that been fine round town for 700 miles drove to London last night come out this morning coolent empty no white smoke no water marks any where any ideas plz??

Read the above posts. It's your cylinder head that's porous.
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