4 wire O2 sensor

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Vince-ek3

New Member
Right I have an ek3 and I've put a b18c4 engine in and has a obd2a loom, jumper harness going to a p28 ecu chipped. Now on the loom there is only one wire for the o2 sensor but need to make it a 4 wire. Does anyone know where the wires will go on the pinout? Many thanks
 
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