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So here's an update. We tried switching the B1S2 and B2S2 sensors, and the error code stayed on the B1S2 sensor, so it isn't the sensor. We chased the wires pretty much the whole length, and haven't found a wear spot, break, or short, and power seems to be getting to the heating element. Right now it looks like I've either got a problem with the grounding wire, or we have a problem with the computer.
I haven't tried cleaning the contacts where the wiring harness comes back to the computer, so I may try that next. I'll keep you guys updated, thanks for the help. If anyone else has any further advice or experience, I would appreciate it. Thanks, guys!
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