I have a 2013 Kia Sorento with 9,000 miles on it. The transfer case started making a whining noise that corresponded to the RPM'S and lowered in pitch when the RPM's reduced! Took it to KIA and after just listening to it without looking deeper said I needed a new transfer case. Anyone have similar problem or should I be worried about a lemon. This vehicle needed new O2 sensors after a week of purchasing it.