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[Chris_H]

So there are two types of factory-fitted sensors?

with a 4-pin connector and a large hole in the bumper, and

with a three-pin connector and small hole.

Are these units interchangeable does anyone know?  Clearly connectors and holes need sorting but do they work with the same parking ECU? and what wiring patching is required?

The relevance is that I have a pre-loved replacement bumper with the diddy ones and the old bumper (with one mullered sensor) with the whoppers.

Any relevant advice (apart from learning to park properly ) would be appreciated.