Tonight's lottery numbers are 6 - 24 - 18 ... I can't see the rest ...

I mentioned Conshy Ford (OK, John Kennedy Ford, but JK didn't pay me anything to call it the new name) because that's where I go (only when I have to). The car was there yesterday getting heater blower resistor pack replaced (under recall/warranty).
Your CEL will most likely come back on. If you want, I can hook up my OBD-II stuff and get the actual code for reference. I'm not sure I'd know what to look for to confirm a diagnosis leaky manifold gaskets though.
The $110 is forcing everyone that gets the "O2 sensor is bad" code (30 sec diagnostic) to share the costs in the "Bank 1 Lean" code (usually a little tougher to track down the culprit). Conshy Ford is OK by Ford standards, but I've seen less that stellar workmanship out of them. Like reused axle bolts (supposed to be one time only) found when doing the 3.0. Or trying to sell me a new front lower control arm (at $750 with labor

) when the spring guard recall parts were knocking around and they couldn't figure out why. And overtorquing my lugs when rotating the tires. I don't pay them any more money - other places can do the work better and cheaper.