Proper road test done, next is hunt for dust shield and see if connections on tail lamp can be cleaned up and resoldered. Will update in a couple weeks.

 

Wired in a new 921 plug to replace the burnt one. Still no dice, anyone know how to access the wiring under the designer high top?

 

Current status: guessing something was screwing with the tone ring readings in the sensor. Only valid code now is 81 likely referring to her CMSL being non functional. Gonna try pulling out the interior trim along drivers side and check for maintenance access/cancer.