Z Probing issues

Hi,
I hope you can help/ I look many website/forum and I can't find the answer. My extruder is lower that my Z minimum. 

ex: 
Do a homing (g28 X) and after it's done, the Z move down, the extruder is at the right position. I do G1 Z3 and Z go up to 3 mm. I do G1 Z0 and the extruder/z stop at around 1mm from the bed.

How can I bypass the Z sensor after a homing?

Thank
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