EXPLANATION OF MAINTENANCE ITEMSMAINTENANCEScheduled MaintenanceLog71Spark PlugsReplace at specified interval. Installnew plugs of the same type as origi-nally equipped. A qualified technicianshould perform this operation. Toensure optimum engine performanceon ES 350, replace only with DensoFK20HR11 plugs or equivalent.Steering Linkage and BootsWith the vehicle stopped, check forexcessive freeplay in the steeringwheel. Inspect the linkage for bendingand damage and the dust boots fordeterioration, cracks and damage.Replace any damaged parts. A quali-fied technician should per form theseoperations.Timing ChainThe timing chain requires no periodicinspection.TireRotationSee your OwnerÕs Manual for tirerotation requirements. Check tirepressure and check tires for damageand uneven wear. If the vehicle isequipped with a spare tire, check thecondition and pressure of the spare.Tire-Pressure Warning SensorsAtire-pressure sensor is mounted oneach full-size wheel. These sensors do not require periodic maintenance.When a sensorÕs long-life lithium bat-tery becomes discharged, the batteryshould be replaced by a qualifiedtechnician following procedures inLexus service and repair publications.Transfer Case/Transmission Inspect each transfer case/transmis-sion component for signs of leakage.If you discover any leakage, have itrepaired immediately by a qualifiedtechnician.Note: The transfer case/transmissionand transmission fluid are a complete-ly sealed unit. Therefore, periodicchecks and replacement of the trans-mission fluid arenot required, andthereis no dipstick on the transmis-sion. Any repairs that require addingor replacing fluid should be per-formed by a qualified technician fol-lowing procedures in Lexus serviceand repair publications.
