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I just finished replacing the head gasket in my ‘03 z4 3.0i, and it almost runs well, minus the problems described in the title. The check engine light is on, and when I scan it I get 2 codes, p16a1 (internal control module memory checksum error in application software) and a secondary code p1634 (throttle valve adaptation spring test failed). (The coolant light also won’t go away, even though the resevoir is full, not sure if this is related or something else). I have been searching the internet furiously looking for an answer, but I have barely found any mention of the primary code anywhere. I found a lot of people resolving the secondary by cleaning the throttle body, but I just cleaned it before I put it in over the weekend. Any help is appreciated, much thanks!