Does anybody knows for sure the role of that part in the CIS system ? Part number is 035 133 563E (Bosch 0 280 160 143). You can see it on this EKTA PDF file, 1,33, 15-00 ,number 29. (http://filebox.vt.edu/users/rfitton/ETKA/1_33_15-00.pdf) TIA, Louis-Alain