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removing o2 sensors

hey everyone am having problem removing 2 of the 4 o2 sensors. 2 came off easy and the last 2 would not move at all. can i use wd40 on them?
 

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hey everyone i need help. i bought new bosch o2 sensor for my 98 na. theres 4 wires on the new o2 senor which is 2 white 1 black 1 grey. does anyone know which wire goes where. i need the car running by tomorrow. or does anyone know what 4 wires on the stock harness is and i can go from there.
 
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