TSB: FRONT STRUT FLANGE NUT REPLACEMENT - This bulletin provides the procedure to replace the front strut flange nut on some 2016MY Optima (JF) vehicles, produced from February 2, 2016 through May 19, 2016, which may exhibit a noise coming from the front strut area while driving on uneven surfaces or a bumpy road. Diagnose the noise complaint and once confirmed to be emanating from the front strut area, follow the procedure in this bulletin to replace the front strut flange nut.
