Piston Slap: Xterra’s External Air Bag Influencers?

Mike writes: Ok Sajeev, I got one for you. I own a 2009 Nissan Xterra 4wd X model.  It has nearly 100k miles on the clock.  In the past week, whenever I start the vehicle, I hear a chattering noise coming from the passenger side dashboard.  The noise p…