Lug nuts are 2-piece: steel nuts with chromed covers crimped on. the nuts rust inside the chrome covers and swell so that the lug wrench that comes with the vehicle (nor sockets or typical 4-way lug wrenches) will not fit the nut. one can be stranded on the side of the road unable to remove a flat tire. besides the wheel locks, all 16 of the remaining nuts were affected. i have ordered replacement nuts, on advice from my local tire shop, that are chrome plated and not 2-piece. i informed toyota customer service of the problem and they acknowledged receipt butoffered no solution or compensation. the problem occurred when i needed to remove a tire, but thankfully it was still driveable. my local tire shop was able to hammer-on a socket to remove the swollen nuts, and i will have to return to them to have them install the replacement nuts. i am retaining the original nuts in case they are needed by nhtsa or toyota for examination. there are many reports of this issue online, as well as mentions in product questions about replacement nuts on amazon.com (eg, are these nuts one-piece or not, and reports of ...
I was driving on i-35 and has to stop at the shoulder for about 30 seconds to fix something. the shoulder is smooth and newly paved. then i went on driving again, minutes late, the tire low air indicator was on and a few more minutes later, the left front tire was totally flat. the tire has only 7500 miles on it and was told by toyota dealer that i need to purchase a new one. and there is no warranty on it since it is from a new car and i did not purchase their extended coverage. i think it is quality of the tire used and i saw tons of same complaints from other toyota highlander owners. *tr