Originally Posted by amgstyle
wat does it mean when it says upstream and downstream?? also that show's the wire diagram of the o2 sensor itself i was looking for the wire diagram for the ecu. i want to tap into the o2 sensor wires but not from underneath the car but from under the hood near the ecu. thanks for the fast response back.
upstream (before) and downstream (after) of the cat.. I have the ecu pinout page number on a postit at home.. Use the search function on the pdf reader, search for ecu pinout.