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Hi, I was looking fitting an induction kit, but when I lift the air filter out, there seems to be some sort of sensor in the bottom of the air box with a vacuum pipe on the top of it, does anyone know wot this is and wot it is for? And if so wot do u do with it if u remove the air box Thanks

Hi newbie here, I have an Audi A4 b8 2011 2.0 tdi, I was looking at putting an induction kit in but wen I removed the air filter there seems to be a sensor in the bottom of the filter house underneath where the filter is, it has a 2 pin plug going into the bottom of it also has a vacuum pipe...