First, make sure the oxygen sensor is getting heated. That voltage comes from fuse 4, so if there's a problem there, you'll get the 212 and no tank pump. The electrical heater is necessary. Then give it a new sensor. A universal is OK if you want to fool with the splice kit in trade for the $$, but anything you might hear on the internet about using an unheated sensor back where yours is... well you heard it on the internet. What can I say.

And when you check for codes, get them all. Don't stop with the first one that reads out. And reset the ECU after you get the codes by lifting out the 25A fuse momentarily.

--
Art Benstein near Baltimore

“The single biggest problem in communication is the illusion that it has taken place.” George Bernard Shaw