Rear Left Inner Parking Sensor Failed

[sapph940-1]

Thanks. That’s the one I’m leaning towards.

Rear left inner is what Orbit output. No number.

There’s an additional sensor on each side, out of view, by the wheel wells.

All models with only 4 sensors it's exactly like this. 1,2,3,4 from left to right and rear outer left, rear inner left, rear inner right and rear outer right.

Maybe somebody knows better?
But I checked the wiring diagramm and the parts list but in both cases no numbers or namings...