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Jordo!

I've been told the ECU may adjust the mixture by a good friend who is a very experienced Nissan tuner, but I'm not certain whether it would aim for a leaner burn to reduce emissions or something else entirely.

Next time I talk to him I'll ask.

EDIT: Actually, maybe he was thinking of a different DTC, like for heater circuit (or I misheard him).

Maybe worst issue is the CEL light?

I'm sure on the other comments about why the CEL and how to prevent it, but not on how or if the ECU adjust things in response -- I might just be totally wrong on that point.

If I'm just wrong on the ECU trim response, then that would explain why tripping the DTC isn't that critical -- just annoying.

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