P0171 system is too lean on bank one?

Hello,

This code P0171 can be triggered by simply a oxygen sensor. However it can be the reason of few other issues as well.

Could be due to restriction in the air induction system.
Blockage in the injector.
Faulty Mass air flow sensor.
Fuel pressure.

https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor
https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

I have attached the diagnostics for that code. This will help you determine the issue and pin point the problem.

Please let me know of any questions.

Thank you.