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You need the service manual, a scan tool, DVOM.... need to go down the diagnostics in the service manual for that DTC code. Just throwing parts at it is guessing. Could be a wire, short, open, bad module, bad part.... the only way to know is using the service manual diagnostics.
With those mods, the O2 connectors have been apart several times. Could start with checking each end of each connector to make sure a terminal has not been pushed back or split open. Beyond that you will need the service manual to determine which terminals are ground, power, reference, signal... and a scan tool to watch the O2 data.
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