2007 Lexus IS 250 Owners Manual - Page 300

4-3. Do-it-yourself maintenance n Selecting ID codes When replacing tires, make sure to select the ID code set that matches the new tire set. If the incorrect ID code is selected, the tire pressure warning system will not operate properly. Tire pressure ID code settings display Press < or > repeatedly until the setting display appears. Switching ID codes Press the ON/OFF button to switch between MAIN and 2nd ID codes. n When to replace your vehicle's tires Tires should be replaced if: l You have tire damage such as cuts, splits, cracks deep enough to expose the 4 fabric or bulges indicating internal damage l A tire goes flat repeatedly or cannot be properly repaired due to the size or Maintenance and care location of a cut or other damage If you are not sure, consult with your Lexus dealer. n Tire life Any tire over 6 years old must be checked by a qualified technician even if they have seldom or never been used or damage is not obvious. n If the tread wears down below 0.16 in. (4 mm) on snow tires The effectiveness of snow tires is lost. n Low profile tires (models not equipped with 16-inch tires) Generally, low profile tires will wear more rapidly and tire grip performance will be reduced on snowy and/or icy roads when compared to standard tires. Be sure to use snow tires or tire chains* on snowy and/or icy roads and drive carefully at a speed appropriate for road and weather conditions. *: Tire chains cannot be mounted on 18-inch tires. 287