Question about 1988 Toyota Cargo

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Location of elec. connectors for main O2 sensor on 88 toyota van

Have an 88 Toyota Van Wagon LE (4Y-EC). Somehow the main oxygen sensor electrical connectors were disconnected and I can't find the female end to re-connect to. The male end coming from the sensor is only about 18 inches long, so the female end can't be that far away. Could it be stuck behind something / where could it be? I don't even see any wires where the end may have broken off. HELP.............Thanks

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