z4 2003 SMG GEAR

could be a number of things:

1. hydraulic fluid level on pump on gearbox
2. could be smg relay
3. could be drivers seat pad sensor

would say likely to be no. 1
 
I agree with mac27040. Likely to be hydraulic fluid related. What does your gear display on the dash say when it throws it into neutral and when it will not select a gear ? Have you checked any fault codes ?
 
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