Don't blame the 'Eastern Europeans', these cars can easily cope with jet washers, unless sensor is not sitting properly and there will be more water going behind it than usual.
Lay on your back and look up if there is connector. You may not see it as there is fairly big/long return on the bottom of the bumper so you may have to get your hands dirty. Or ask Eastern boys, they don't mind getting hands dirty.
Main control unit is in the boot where the front and rear connects to, but that's not where the problem is.
I can't remember, but the rear bumper isn't a piece of cake to take off, battery out, boot edge trim, wheel arches ??
And yes to your question if its the no 3 & 4 sensor if you stand behind the car.
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2006 D3 S8 5.2 V10
Ceramic Brakes, Bang&Olufsen, DTV, DAB, Rear Camera, BT, TPMS, Soft Close, Auto Boot, AMI , 4 Zone AC, Home Link, All Electric Blinds, Fingerprint, Ski Hatch, Black Extended Leather, Heated Sport Seats, Alacantra, Carbon Trim inc Aluminium Pack 2.
2015 A3 S line 1.4 TFSI - for the missus to keep her away from my car.
Standard S-line equipment, no extras.
2006 D3 A8 3.7 V8 - SOLD but not forgotten
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