I need help with my 03 G35 sedan!!

Musicassassin

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Yesterday I replaced my Mass air flow sensor, because a code popped up. Everything ran fine after that. This morning on my way to work; my SES light came on and my vehicle went into limp mode. I haven't had a chance to get the code scanned due to me being at work, but does anyone have any ideas as to why it would run fine and then go into limp mode the next day?
 
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