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

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.