Slk 230 Kompressor - chass. 170.449 - eng 111.983. Having a code come up stating the o2 sensor on bank 1 is bad ( front - next to the exhaust manifold ). Retrived part # 001 540 37 17 off the current sensor. According to serveral internet sales people this is the part # for the "rear" sensor ( behind Cat. Converter ). Have checked on this site and found conflicting part #'s 001 540 06 17 and 001 540 60 17 as front sensor part # ??? Can anyone tell me the " correct " OEM part # for the front o2 sensor. Has some idiot put the wrong sensor in the wrong position ??? Just wanting to be correct in replaceing with correct OEM proper parts. Thanks for your help.