1 - cylinder head; 2.7 - centering sleeve; 3.8 - threaded plug (M8x1); 4 - cover (∅ 28); 5 - stud (M6x30); 6 - stud (M6x60); 9 - stud (M6x28); 10 - bolt (M8x28); 11 - harness holder; 12 - spacer; 13 - seal; 14.30 - lid; 15 - self-locking nut.; 16 - nut (M7); 17 - stud (M7x95); 18, 20 - center, bushing (∅ 9.5); 19 - support bar; 21 - bolt T (M6x50); 22 - bolt T (M6x70); 23 - bolt 7 (M6x100); 24 - threaded plug with sealing ring (M12x1.5x26); 25 - bolt; 26.35 - sealing ring; 27 - stud (M7x39); 28 - hairpin (M7/6x29.5); 29 - threaded plug (M18x1.5); 31 - guide bushing; 32 - head bolt (M10x110); 33 - spacer washer; 34 - cover (∅ 22); 36 - threaded plug (M10x1.0); 37 - cover (∅ 18); 38 - stud (M7x55); 39 - sensor; 40 - exhaust valve seat; 41 - valve seat; 42 - stud (M6x25); 43 - sealing gasket; 44 - check valve
They are based on the Hall effect and generate a pulse of the position of the first cylinder at TDC of the compression stroke, which is the reference signal for the start of the countdown and operation of the D-VANOS system.