The picture in the eautopartscatalog is the right picture. It looks like the one on my benz. #47 is different from that picture. #47 is the one AZ sold me. Look closely and you will see the difference. The catalog sensor has a different electrical connection than that on #47. I may be checking in with you guys later when / if the CEL comes on again. It probably will, and, when it does, I'll get the diagnostic check again to see if the same code comes up. If it does I'll order the part from this site.

Thanks again for all of your help.