so i finally took my car down to get scanned and it came back all 3 o2 sensors are out and my air to fuel mixture is off........ i have to use ac delco o2 sensors, correct....... do i have to take it to a shop to fix the air to fuel ratio

Codes do not say replace 02 sensors.
What were the code no.?
What engine?
All 3 02 sensors do not go bad at one time.
What is the tune up history?
Any blinking check engine lights?

i don't remember the code number, however i do know that i had 9 errors, six of those were saying that the o2 sensor in bank 1, 2, and 3 were not responding........ the others were pertaining to the air/fuel mixture being off........ i had a complete tune up done when this problem started, all ac delco parts.......... i reset my computer after all of this, correct

i don't remember the code number, however i do know that i had 9 errors, six of those were saying that the o2 sensor in bank 1, 2, and 3 were not responding........ the others were pertaining to the air/fuel mixture being off........ i had a complete tune up done when this problem started, all ac delco parts.......... i reset my computer after all of this, correct

Code do not say replace sensors.
They only point you to the problem and say check it out.
Code no would go a long way in pointing out the problem.
I would reset the pcm first and see what code comes back first.
And watch that fuel pressure for up to specs and no fast leak down.
What year make and model and engine do you have?