P0171 and P0174 lean codes, can’t seem to fix them.

[Avyn Nix]

Are the cats the same on 4.0 sohc explorer?

 

[DILLARD000]

Are the cats the same on 4.0 sohc explorer?

Pic below is arrangement for CatCons+OxSensors on my 2001 V6~4.0L~SOHC;
suspect yours is similar; best that you crawl underneath & confirm.

 

[Avyn Nix]

Pic below is arrangement for CatCons+OxSensors on my 2001 V6~4.0L~SOHC;
suspect yours is similar; best that you crawl underneath & confirm.
View attachment 96647

I’ve only got three cats on my 2004, if I remember 2004-06 run the same ones and all others are slightly different.