I purchased a used 2003 GS300 on Ebay with 81,000 miles. At 83,000 miles, replace the diver door lock actuator $ 300.00. At 89,000 , replace one oxygen sensor $ 313. at 90,000, the seal between the engine and transmission started leaking will cost $ 700.00. At 91,000 the second oxygen sensor failed and will cost $ 400.00. At 91,500 the car will not start and juts setting in the driveway. This is my fisrt Lexus and just wonderding if these is normal reapir.