I threw a P1130 CEL (according to my AP V.1 which I just read may not be trustworthy for reading some codes) code on the way to work today. I just reset the ECU after reading the code so I'll wait for it to come back again before doing anything drastic, but just a feeler to see if anyone has a used one or even one I could borrow to verify it's the issue.
I have a feeling it's my craptastic wiring fix failing. 5 years ago when I installed my UP, I cut all 4 or 5 wires to that sensor and had to use butt connectors to fix them. The CEL description makes it seem likely:
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Front oxygen sensor circuit malfunction (open circuit)
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