I would tap splice a different sensor that is working. Use some thermostat wire, splice in without cutting the wires just the insulation to the right side.

Use the plug from an old sensor to connect to car side.

Unplug left and right rear sensors and you can do two tests:

1) connect left wheel sensor to right car fitting.
2) connect right wheel sensor to left car fitting.

You could do one at a time or both at once.

If the speedo starts working and the computer sees the "left", indications are the problem is inside the wheel:,eg bearing tone ring.

If the problem stays on the "left" now the right wheel, indication is the wiring or the module.

When the bond wires fail in the module, the usual symptom is some intermittent problems as they touch some or most of the time then eventually a no signal in one or more wheel

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