The O2 sensors are not connected through any relays. What is the problem that you are trying to solve. I do not believe the diagrams can assist you with O2 problems but I have included them. Please elaborate on your problem and I'm sure I can direct you to a solution.
Locations of fusible link, junction and relay block:
Fusible link block:
Junction block:
Relay block #2:
Relay block #3:
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