P1273 Nissan - Altima 2005 2.5L

Question

I just replaced both my O2 sensors and drive about 50 -60 miles. After I turned my vehicle off for about 3-4 hours and turned it back on the check engine light came back after about 3 miles. The check engine code is P-1273 same as before. What's should I do?

Answer 1

If one or more sensors are replaced the Engine Control Module (ECM) Mixture Ratio Self-Learning clearing procedure must be perform.

1998-2012 Nissan Altima Clear Mixture Ratio Self-Learning Control Data

or any easier way to do it is disconnect the battery for 15min or so and drive the car again. if the light does come back on 

you might have issues such as

- Fuel pressure
- Faulty Fuel injector 
- Intake air leaks
- Faulty Air Flow Meter