i bought this ef hatch with an ls in it recently. they told me that the o2 sensor wasnt plugged in but when i look under there i dont see one at all. So my question is where do they wires for the o2 sensor go? somewhere on the back of the engine? just need to know where the wires are going. its an obd0 b18a
thanks

 

it goes on the engine harness.

 

if it is an obd0,
the o2 wire should be right were your wires are that go down to the revers switch,
and under the dizzy. it is a white wire with a ground wires's around it sometimes you cant even see the ground wires. and the o2 wire goes down to the ecu pin c16 i think... wiite wire.