Air con pressure sensor/switch part number

AshT

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Hi guys,

Had my air con looked over this morning as the light instantly goes out when turning it on, turns out that i have a faulty pressure switch/sensor which seats towards the front end of the car just behind the rad.

Computer confirms it too, does anyone know the correct part number for this so I can get source a decent replacement without paying a fortune.

Car is and Audi S3 SB 2011

Cheers