HI there
P0453 is an emissions code and the computer would have to be cleared of the code but not reprogrammed.
P1604 is for a startabilty malfunction. This code should only appear if the engine cranks longer then it should before starting. This can be caused by fuel issues or a low battery. The computer should not need reprogramming for this code either.
P1604 LEXUS - Startability Malfunction Read more: https://www.autocodes.com/p1604_lexus.html
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