where exactly does the 2 o2 sensor heater plug into? is it behind the dash? or behind the motor? because my o2 sensor is it but not plugged into its plug

 

Huh?? really confused...my only o2 sensor when i had my d (im assuming you have a d otherwise im useless to you) was threaded into my headers and the stock location for the plug is on top of the tranny and the mount for it is wedged in between the bell housing and block if i remember correctly.

 

will, the o2 plugs into the engine harness, which goes to the chassis sub-harness, then goes to the ecu, so just follow it and see i guess