2008 code P2096

[KCPat]

Mother in law drove from California to Kansas and midway her truck engine light came on. Checked at Autozone and read P2096 (post catalyst too lean B1). As far as I can tell no difference when it idles or is running down the road.

Suggestions on if this is something I should be looking into getting fixed for her before she heads back to Cali? This feels like it’s something that may take some troubleshooting but I don’t want to let her get stranded either.

Thanks in advance.