May not be pertinent here, but I believe the Climate control's Air Quality Sensor can cause various CAN communication issues if faulty/not an original part.
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(current) '06 P2 S80 D5 SE LUX, Met. Gold/Black leather, 200k
(past)'99 P1.5 V40 SE 1.8 (1731cc), Metallic Peacock Blue-Green, Black Leather, Winter Pack. 101k
(past) '88 340 GL 1.7, gifted to me with "slipping clutch" that was a sticky linkage
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