I just wanted to say thanks again for having such a great forum. My CEL came on, coding lean fuel on both banks. Doing a search here gave several very helpful ideas of what to look for and how to proceed. Thanks to all, but especially MBDiagMan and swwright_47. I really appreciate the help, no telling how much money I've saved.

 

So what fixed it?

 

Sorry! It was the torn boot at the firewall connecting to the PCV valve. All I did was tape it up for now, will go by the dealer for a new piece today. Thanks again!