I am passing this on as I found this error on my truck, and after buying a shiney new O2 sensor, found out it was something else.

I saw the check engine light, and decided to extract the codes to do a self-repair.

Of course I pulled a lean-code out and the indication was the O2 sensor was giving bad results.
(forgot the actual description)

Long story short, I have a brand new O2 sensor in my manifold right hand side, and ended up replacing a little short rubber elbow in my vacuume lines to repair a leak that was causing my error code.

Moral to the story?.. the error code isnt an indication of the problem, just an indication of a sensed fault. Check your not-so-obvious causes before buying what the auto parts guy is more than willing to sell you.

Dude you probably just saved me some money. My Dodge 4x4 is pulling this EXACT code and I have been putting off buying one until I get home to work on it but now I know to check the simple things before I go that far. Thanks