I'm guessing from this fault that you're in the US, possibly California, since Euro cars don't have N335 as far as I can tell from the reference material.
There is provision in the air filter box on some models for it to take a warm air feed from the inlet manifold to aid with engine warm-up. There would be a vacuum valve and likely an associated solenoid to control it. From your description I suspect N335 may control that, in which case I think the first place to start is to see if you do indeed have this feature on the airbox and start following vacuum hoses.
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