The small ammount that an OBDII scanner will do only applies to check engine lights. No SRS, ABS, ESP, BAS, AMM, IC, AC, D2B, EAM, VG, ETC, ESM. It only applies to a small portion of ME in your case. It will do relatively more on your other cars as they have less electronic controls to work with.

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