I have a really good question for all the Ford folks. What is the Wire color for the Upstream O2 sensor that is located on the passenger side exhaust manifold? I have the Mitchell diagrams in my Haynes manual and I also have the '92 Powertrain/Emissions manual and I cannot find anything corresponding to that sensor or what wire color it would use.
When I got the truck, the weather pack connector was completey destroyed. I re-wired it, but I must be wrong. I traced the wires back, and the color wires I have are YEL-RED and GREY-RED. Those 2 wires correspond to a knock sensor, which I could not find a connector from a actual sensor working from the block. there was a 6-pointed piece in the block but it is flush with the sides.
I'm at a lost on my code 41, but my assumption about having the signaling O2 sensor not working correctly leads me in this direction.