code p0306 cause codes p1135 an p1155 to come on on a 1999 lexus es300

Code p0306 cause codes p1135 an p1155 to come on a 1999 lexus es300

the fault code [generic-po306] is a cylinder 6 misfire,and can throw up manufacture specific p1135 and p1155. get a local garage to remove the number 6 plug from your lexus,and view the electrode end to see if it is 'oiled up'as you could have an internal engine problem,however it is rare to just have 1 cylinder with a specific problem,and will most commonly be the coil,you would be better off to replace all the 6 spark plug's and the 1 coil for that defective cylinder,