2012 Tucson - the alarm goes off ocassionaly when I put key in ignition and try to start vehicle?

The remote entry fob has 4 buttons and one them is blue with a key pictured, what does it do?

Car does not have remote start feature!

Thanks

 

What does your owner's manual say regarding the operation of the key FOB ?

 

The manual does not show a picture of the fob I've been using, it shows a different one!