Yea try neutral, but the common problem that fits your description is the steering lock. The problem is that there is a POS tube that runs from the tumbler through the lock to the actual electric switch. The tube cracks and folds over not fully transmitting the rotational angle to the switch which then doesn't get to the start position.

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