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I am having the same 2 codes on my N20 along with 321C which is a leak in the tank deaeration and purging air system. I get the half check engine light only on highway speed when I am on an incline saying engine malfunction and reduced power but I do not notice any reduction in power. The only symptoms I am noticing are increased fuel consumption by 4l/100km in both highway and city driving and a rattle noise which I think is the wastegate because it sounds like when you stop pedaling on a bike and the bike continues to move.
Did you notice any reduction in power or fuel economy? Or did you hear a wastegate rattle noise?
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