EXPLANATION OF MAINTENANCE ITEMSMAINTENANCEScheduled Maintenance Log 71Spark 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 perform theseoperations.Timing Belt (SC)Replace every 90,000 miles or 108 months. A qualified technicianshould perform this operation.Timing Chain (ES, GS, IS, LS)The ES, GS, IS and LS are equippedwith a timing chain that requires noperiodic inspection.Tire RotationTires should be rotated according to the instructions in your Owner'sManual.When rotating tires, checkpressure and check for damage anduneven wear. If the spare is not rotat-ed, check the condition and pressureof the spare.Tire-Pressure Warning SensorsAtire-pressure sensor is mounted oneach full-sizewheel. These sensors do not require periodic maintenance.When a sensor's 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 are not 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.2010 Lexus Sedans_48-80d 7/21/09 2:00 AM Page 71
