I've replaced my rear O2 sensor twice in less than a year, and now another one has failed. This time, it came has come back to life for a few weeks and died again a few times. I can't find any obviously loose wires. Anybody have any ideas. It is a 1996 2.2 four-cyl. (It's really an Odyssey, but it is the same engine as the '96 Accord.)