My luck with Nissan is pretty shitty. We family has owend 7 Nissans over an almost 30 year period currently my parents have two and my sister and I each have one. My alternator crapped out about 200 or so miles after the warranty and they told me to pound sand.

Now back to your question. Ive never heard of a MAF going bad but it is an electrical part so anything can happen. 490 is pretty step of a price but you might talk to the service manager and remind them that you have two nissans and hopefully you have brought the truck their for maintenance, that helps alot, and if the repair could be good willed!!! Its worth a try.

Good luck and let us know what happens.

Tim