Well its involved a subscription with alldata and alot of testing, Teky you were indeed correct. Alldata confirms that error 6 of pin 6 is a right rear sensor. In the attempt to remove, attaching hex bolt broke and the original sensor could not be removed from its socket. Its amazing how much copper wire is wrapped up in the magnet of those things. Had to break the original sensor at the face of the hub (right word?), remove the core magnet and pry out all of the copper windings. Took a little time. The worst was breaking 2 twist drill bits (able to remove successfully intact), one easy out and the multiple cable supports. Man was that thing rusted in.

Anyways.....done. Works beautifully again.

__________________
1995 E320 -171k-km
1995 S420 -333k-km