2000 avalon with error codes 1150, P1155 and P1250

Why replace any parts based solely on a trouble code?? Codes do not indicate any part has failed - they simply offer a place to commence *hands-on* testing so the actual culprit can be discovered. In fact P1250 is likely contributing to the other codes. Quite frankly - this need to be properly diagnosed by qualified personnel using the required testing equipment.