Hello , I'm helping a friend of mine doing a engine swap , I'm putting a jdm engine with a P72 computer , we got the engine and headers & 02 sensors came with it , but not installed . is there anybody have a wiring diagram to look for the 02 sensor wire ?

 

Just saying P72 doesn't tell us what year it is. OBD-1 vs. OBD-2??

I'm guessing OBD-2 since you say O2 sensors (plural). So my OBD-1 wiring won't help you...

 

Sorry , its a 96 hatch matic , converted to 5 speed w/ a b18c jdm motor w/ p72 ecu , it only has 1 o2sensor at the headers . also i'm using obd1

 

So if your P72 ECU is OBD-1, try this...

One of the sensor heater wires should get power from the main relay. That's not really an ECU connection.

There's 3 ECU connections for the O2 sensor.

A6 is the ground side of the sensor heater.
D14 is signal wire from O2 sensor. Maybe that's a shielded wire?
D21 & D22 both should be signal ground, perhaps D22 is signal ground for O2 sensor.