P0171 Code System too lean Bank 1 Diagnosed and Resolved | Toyota Corolla

I explained how I diagnosed and fixed P0171 code for my 2010 Toyota Corolla for just $2.

Support my channel, purchase directly from our online store https://eazidiy.square.site/s/shop

Kindly use my amazon link below for your purchase(s), it helps me with a little commission. Thank you!
https://amzn.to/3vRirMP

What does the P0171 code mean?
A Code P0171 or system too lean bank 1 means either too much oxygen or too little fuel in the exhaust. This is a ‘lean’ condition or a ‘low fuel trim’ code.

The P0171 OBD-II code indicates that the fuel system on the first bank of the engine is weak or that a vacuum leak exists near this side of the engine. A lean state happens when the engine receives either too little or too much fuel.

What causes a P0171 code?
Some possible causes of a P0171 engine code are:
Vacuum leak
Weak fuel pump
Broken fuel pressure regulator
Blocked fuel filter
Faulty powertrain control module
Defective injectors
Faulty oxygen sensors
Clogged catalytic converter
Problems with the mass airflow sensor