Where can I buy z4M O2 sensors

Hi I've made a test right now, I've unplugged both pre cat O2 sensors, an VOILA no me idling problem.... afeter that I've turned off the car I've plugged both O2 sensors and idling problems came back
BMW has requested the O2 sensor to Germnay so now I wonder....is there any problem driving with both O2 sensors unplugged????

regads
 
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