PDC Reset

[dazzpowder]

I recentlt reversed into another car and the corner PDC sensor popped out of it's housing, I bought a new fitting collar for the sensor and refitted it, it appears to work yet a BMW dealer is quoting to 'Rest PDC' amongst other things.

Des anyone know if the PDC has to be reset after a a slight knock I thought these things either worked or didn't, the face of the sensor isn't damaged.

Anyone throw some light on this?

Thanks