I may have got the sensor wires totally wrong - don't rely on the pins I mentioned - I haven't touched the wiring on my car since 2006.
The comment about voltage remains though - with the narrowband, the Ecu is simply measuring the voltage.
If your ECU isn't correctly earthed that could explain the voltage offset and the problems.
I have a honda manual somewhere with the official wiring diagram within. I'll dig it out tomorrow if I have a chance.
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