I have a 02 Toyota Avalon I have a code p1135 p1155 I changed all three O2 sensors upstream and downstream and the cold still won't come off my car is also has a problem starting early in the morning and I have to rev It Up just for it to start at one time I was at a light and my gauges went up and down that happened once why is the check engine light not coming off for the sensors

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those codes are relatively generic, dozens of things can trip them. Have a pro with a toyota dealer level scanner at least analyze it first.