TSB: FRONT WHEEL BEARING NOISE - THIS BULLETIN PROVIDES THE PROCEDURE TO REPLACE BOTH FRONT WHEEL BEARINGS ON 2014MY OPTIMA (QF) VEHICLES THAT EXPERIENCE AN UNUSUAL NOISE (HUMMING OR POPPING) THAT IS ISOLATED TO THE FRONT WHEEL BEARING. THE BEARINGS NORMALLY DO NOT HAVE ANY LOOSENESS; THE CONCERN IS SOLELY NOISE-RELATED AND MAY BE VERY DIFFICULT TO PINPOINT. TO ENHANCE CUSTOMER SATISFACTION, THIS BULLETIN OUTLINES THE REPLACEMENT OF BOTH FRONT WHEEL BEARINGS, EVEN WHEN ONLY ONE SIDE IS AFFECTED.
