A (!) flashes for awhile, then stays up, then goes away...what does this mean?

(!) Typically means that you have a low tire. Check your tire pressure and make sure they are inflated to your vehicle specs (not what the sidewall states, as that is just the max pressure) You can find your vehicle tire pressure specs by looking for a placard on the drivers door jamb which will tell you the pressure to run in all the tires. Sometimes the placard is located on the drivers side rear door jamb so look there too. My tire guide states that the pressure for all Murano tires under 20" diameter is 33 psi Front and rear, 20" tires require 34 psi front and rear, but it's always best to reference the placard or owners manual.

Yellow light... Have ALL tires checked for proper inflation or air pressure..... Now that includes the spare tire also!!!