Long story short...
Myrtle ran sluggish. Smelled unburned fuel. 15A fuse F2 popped in engine bay with Check Engine Light (CEL) .
Grabbed Nanocom. Read 3 ECU fault codes:
P0141 - O2 Sensor Heater Circuit Malfunction b1s2 (left rear O2)
P0158 - O2 Sensor Circuit High Voltage b2s2 (right rear O2)
P0161 - O2 Sensor Circuit Malfunction b2s2 (right rear O2) - triggered CEL

Crawled underneath. Found b2s2/right rear/downstream O2 sensor wiring was rubbing against the front drive shaft.
Ordered a set of original NTK #25624 O2 sensors from Amazon at $25 a piece.
R&R'd both downstream O2 sensors with a large adjustable wrench. Repositioned O2 wiring away from moving and sharp edged parts. Replaced engine bay 15A fuse F2. Cleared fault codes. Reset adaptions. Went for a test drive.
Problem sorted.

Hope this helps others...

 

Good find!

Taking the time to trace and inspect paid off. Most people would have thrown o2 sensors at it and called it good.

 

Nice! Lucky short did not send 12v to ECU on sensor wire......