I've been throwing ABS fault 045 "left rear sensor low output" for a few days.

This afternoon, after clearing the code - it returned. This time as "left rear sensor Bad Output". I decided to swap the sensor with a known good one from my parts truck And the first bump I hit after install during a "test drive" the "four Amigos" illuminated again. Same code, 045, "left rear sensor bad output".

It seems every time I hit a bump in the road the ABS TC HDC and Brake light illuminate.
I'm stumped...

I performed a resistance test on the replacement sensor prior to installing, I think it read roughly 1020 ohms. In the upper limits of specified range. I think optimal range is within ~950 - ~1120 ohms. The reading bounced around a bit as I tapped the sensor against metal...

What should I be looking for?

* trace wire back to SLABS - inspect for ground faults along chassis?
* bad wheel hub? What makes up the hub? A bearing and casing? I don't believe the bearing is worn.
* fault at connector at SLABS unit?