ChrisD

Its my car Phil was talking about so to answer your question: I guess the guys that installed the ECU for me must have drilled a hole for the canbus wiring as there is a hole in the front of the case that these wires go into. The USB cable is still there permanently so that hasn't been replaced. I've taken the ECU case off and done continuity test right from the pins on the circuit board to the ends of the wires where they plug into the little boxes that run the O2 sensors and all was fine. FYI here's a screenshot from the link software if that helps. To clarify, the O2 sensors and EGT sensors that run on this canbus wiring were all working fine for several months. Then one O2 sensor stopped working, then about 2 months later the other O2 sensor and EGTs stopped.