Why doesn't the colored wires in my stock civic vx ECU wiring harness match the colors of the pinout diagrams I've been seeing for "civic/integra OBD1 P72". A lot of the wires match the pinout diagrams but then many (including my O2 sensor wire) are a different color than they should be. How can I check the wiring if the colors are not 100% matching? Are they not supposed to match?