I’m not certain but the red/white stripe wire that gets power from the f4 fuse provides power to the heater circuit on each of 4 O2’s. But at the F4 fuse box there is only one wire that runs out of the EBox into a wire bundle wrapped with waterproofing through a finned plastic conduit then breaks into 4 red/ws lines and 4 black rounds for the 4 O2’s.

If the short is somehow inside the wrapped wire bundle or the conduit will be beyond my meager skill and physical reach to replace a wire(s). Sure hoping the short is from the rear of the engine forward or I’m gonna have to send it out.

Been pouring over the Bentley electrical diagrams hoping there is some sort of relay or other fuse that makes it appear there is a short but so far nothing.


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