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Lexus is300 Limp mode

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so recently my wife overheated her is300 (bad radiator cap) and the car went into limp mode. i had to change all of the front seals on the motor anyways so i did that and put a new radiator cap on it, along with a new bank 2 sensor 1 o2 sensor, timing belt and vapor sensor as it was broke. None of this stuff has fixed the problem and the car is throwing no codes sadly any ideas?

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car wont rev passed 4k and checked throttle already also just found it has a rattle in the bottom end coming off of revs....

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do you have any pending codes?  the IS300 ECU is insanely sensitive to things. 

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im honestly thinking it went limp mode with the knock sensor due to bottom end rattle off rev's

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