Ok im doing a d16z6 swap on my 88 ef i bought the ecu jumper harness i know i have to wire the four wire O2 sensor but now do i have to plug up my old 1 wire O2 sensor? or just leave the old plug for the old O2 sensor alone and wire the new sensor?

 

obd-1 only uses one 4 wire o2, so no. u just wire up the one 4 wire and be done

 

thanks i thought i had to wire both of the O2 sensor