Check Engine Light On problems of the 2007 Lexus IS

I work for Toyota/Lexus manu plant in ky. My vehicle started throwing a misfire code (p0304) and check engine light came on. My car was diagnosed by Lexus dealer as having carbon build up in engine (temporary repair will cost $600 to clean engine. Permanent repair that will eventually have to happen $15,000). Lexus did offer a csp on this Issue and extended warranty on this Issue but you could not go to the dealer and have it diagnosed until the check engine light came. The check engine light did not come on until it was out of warranty. After many phone calls and continuous complaining Lexus would not stand behind their product. I finally had to file a complaint thru the warranty dept at the manu plant. Lexus finally called me back and said they would pay the $600 to clean the engine, she did tell me that the only reason they were even talking to me was because I work at the plant. I had the engine cleaned oct 2017. The dealer told me that this carbon build up will return and I will eventually need an engine replacement.

Vsc warning light came with check engine light. Pulled in a local dealership, was told car was ok to continue driving but make an appointment for service. Left dealership, went approx 0. 5 miles to get gas. When I stopped the car there were loud scrambling noises like an animal was loose in the dash. Popped the hood, couldn't see anything- looked under car and all the transmission fluid was pouring out. Had car towed back to dealership. Still waiting for verdict. Car Is only 7 months old and this will be my 3rd time in the shop. At 3 months had to receive full wheel alignment due to severe shaking and pulling to the left. At 6 months brought car in complaining of a loud creaking during turns- arm bolt was loose and needed to be tightened. Also, the windshield makes a loud crack/pop noise every morning on my way to work. This car had excellent reviews, what happened!.