Don't know a lot about lincolns, but it should be the same as a ford. I'd say check the wiring to the o2 sensors, and there should be a fuse for the 02 heater, check that to make sure it hasn't blown. If you have the owners manual you should be able to locate the fuse. Good luck!
well I had just gotten a job done on it for short to ground for fuse 44 because it came blowing an the tech said it was bank 2 sensor wiring rubbing on the transmission and he rewired it and the fuse stop blowing and it cleared some of the codes but still stuck with the two I mention in the blog
Then I would say it is likely the CAT like @alexrickard86 said, but that should be a different code.