I think he says fuse blows when zero O₂ plugged in. You need to unplug the TCM (EGS) and you can meausure the wire squid to ground vs. Blow fuses to test.

Four O₂ heater will look like a short on a DMM so leave those unplugged. Unplug the EGS and see if the wire is shorted before putting in a new fuse.

The egs can be opened to check for a mechanical short eg: pin to chassis. I can't remember if egs or DME needed to be drilled open. One uses rivets but a simple machine screw can replace the rivet.


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2011 E70 • N55 (me)
2012 E70 • N63 (wife)