cel code ?

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Im geting a 3 codes after my d16y8 swap. I know how to fix all but one and it is a code 91 any ideas. Also what is the proper way to test a 4 wire o2
 
well i guess i dont know how to fix all of them here they are and what i thing they are
54 CKF Sensor (Crankshaft Speed Fluctuation)
65 Oxygen Sensor Heater (Secondary)
91 Fuel Tank Pressure Sensor low input

how do i fix 91 and 54
thanks for any help that can be given
 
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