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I really don't think that adding wire is causing a code. There is something else going on here. I had to add wire to O2 sensors before for turbo installs, and never had an issue.
Also, the signal that is sent to the ECU is very very low current, there is no way that there is a significant voltage drop from the wires. The heater circuit may take a few amps, but I am sure the signal is in mA.
BUT! They do reach. Mine did.
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