Anybody here know the best way to access the upstream O2 sensor harness on the passenger side ? Don't want to remove the sensor while twisting the wires.
Hey, when I put my h-pipe on I loosened the the two nuts on the header flanges and lowered the h-pipe down and then tightened the bolts back up so as to not stress the harness. I was then able to blindly get my hand up to the harness and disconnect it. I have gorilla hands and there was just enough room, to force my hand in there. I spent a few minutes just orienting my myself to the harness and connector and it was a piece of cake after that.
Remove the battery and battery tray and you can access the O2 sensor connector from the engine bay. Much easier than fishing for it from underneath the car.
Can you really? It's not too far out of reach ? I imagine reaching down and my wife walking in the garage and seeing my legs up in the air. I guess I didn't think you could reach the top of the transmission where the harness is.
From the top I could barely squeeze a couple fingers down there. You have to be 125 pounds and bendy. I chose to go from underneath. I have a 4 post lift in my garage that allowed this. I removed the clamps from where the h pipe meets the catback. I then loosened the flange nuts all the way to the end of the studs. Pulled it back just enough to maneuver my hand up to the harness. I followed the advice of Draiter above