Air-flow sensor The air-flow sensor flap and compensation flap are clearly visible behind the Plexiglas housing and can be moved back and forth. Can be seen: from behind the potentiometer and the IC. description ordernumber 1183 see also: vane-type camshaft adjuster in-line fuel-injection pump with centrifugal governor tandem hydraulic pump, PC cylinder head with direct petrol injection (GDI)