The answer to your code 19 and reset question comes with the use of a proper tool. Code 19 is an adaptation code so the obvious answer is to know what your adaptations are! Code 19 occurs when the adaptaions are used up. There are two separate forms of adaptations and the ones that are used up will tell the story. The chip doesn't change anything it just opens up a larger range of adaptation, so larger correctiona can be made by the controller.

A proper tool will clear all codes at once.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician