I've had the same problem with my 2014 Nismo with Stillen cold air intake. Intermittent safe mode on start-up. Returns to normal after shut-down for 15-20 seconds. Dealer has been working on it for a week now, still no answer. Factory technician was in and also looked at it--no joy. Replacing MAFs because they failed, but techs don't believe they are the cause.
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