In my 7 Series I have been running empty for 2 months now and still when I press the Ambi Air to setting no. 3 I can sense the smell, so it certainly opens the valve and lets the air through. If you look at the delaer options when trying to order you have a couple of sents of which you have them labeled no1. Or no2. As I think no.2 is a stronger sent than no.1
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