EXPL ANA TION OF MAINTENANCE ITEMSMAINTENANCEScheduled Maint enanc e Log 69Spark PlugsReplace at specified inter val. A quali-fied technician should per form thisoper ation. T o ensur e optimum engineperformance on ES 3 50, replace onlywith D enso FK20HR11 plugs orequiv alent.Steering Link age and Boo tsWith the v ehicle stopped, check forexcessive freeplay in the steeringwheel. Inspect the link age for bendingand damage and the dust boots fordeterior ation, cr acks and damage.Replace any damaged par ts. A quali-fied technician should per form theseoper ations.Timing Belt (S C)Replace e very 90 ,000 miles or 108 months. A qualified technicianshould per form this oper ation.Timing Chain (ES, G S, IS, LS)The ES, G S, IS and LS ar e equippedwith a timing chain that r equir es noperiodic inspection.Tire RotationTires should be r otated accor ding to the instructions in y our O wner 'sManual. When r otating tir es, checkpressure and check for damage anduneven w ear. If the spar e is not r otat-ed, check the condition and pr essureof the spar e.Tire-P ressur e W arning Sensor sA tir e-pr essure sensor is mounted oneach full-siz e wheel. These sensor s do not r equir e periodic maintenance.When a sensor 's long-life lithium bat-tery becomes dischar ged, the batter yshould be r eplaced b y a qualifiedtechnician follo wing pr ocedur es inLexus ser vice and r epair publications.Transfer Case/T ransmis sion Inspect each tr ansfer case/ transmis-sion component for signs of leak age.If you disco ver any leak age, ha ve itrepair ed immediately b y a qualifiedtechnician.Note: The tr ansfer case/ transmis sionand tr ansmis sion fluid ar e a complete-ly sealed unit. Ther efor e, periodicchecks and r eplacement of the tr ans-mission fluid ar e not r equir ed, andther e is no dipstick on the tr ansmis-sion. Any r epair s that r equir e addingor replacing fluid should be per -formed b y a qualified technician fol -lowing pr ocedur es in L exus ser viceand r epair publications.81183_09_LexusSedans_046_080f_R1 7/2/08 7:51 AM Page 69
