[xk8] My 1999 XK8 codes PO172 & PO175 1&2 banks rich help

Any clues where to look with these codes in header? I just
had my Throttle Body rebuilt and all codes associated with
it are now gone. I am still stuck with
The banks 1&2 rich codes. Any thoughts on where to start
looking? I did put Techron in fuel tank and have used 1/2
tank so far.
1999 XK8–
Merrick New York, United States
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