P0171 Generic System Too Lean (Bank 1)

SOURCE: P0171 Code (Lean Fuel Bank 1) Engine light on

you nead to check all you vacuum lines for leaks it sounds like you have a vacuum leak or the o2 sensor is going bad on bank 1 **** i still say vacuum leak

SOURCE: check engine light on

Generally when these codes appear it is due to insufficient fuel pressure. Test your fuel pump to ensure it is within specs. Have you changed your fuel filter?

SOURCE: CHECK ENGINE LIGHT CAME ON P0171 FUEL TRIM BANK1 SYSTEM TO LEAN.

Hi. You need to clean the Mass Air Flow Sensor.
This is an easy job.
Get a can of throttle body or brake cleaner spray at your local auto parts store.

Open the hood, and locate the air filter box. follow the tube from the filter box towards the engine. Look for a small black box with 2 screws holding it to the air tube, Remove the wire connector and observe inside the sensor with a flashlight. You will see 2 small wires, and they will appear fuzzy or dirty. Spray the interior with the cleaner until the wires are nice and clean. Do not use compressed air, you will damage the sensor. Put it all back together and drive it.
This will def fix your issue. This is a vey common problem. If you do it yourself, you will save 70 + bucks.

Thanks for choosing FixYa, and a FIxYa rating for my assistance would be greatly appreciated.

SOURCE: diagnostic code #'s p0174,p0171

oxygen sensors are telling you that the mixture is too poor on ur sistem need to check its behaviour and see whats causing that lean mixture
hoope this helps

SOURCE: codes P0171, P0174, P0440

This is usually an oxygen sensor, replace the O2 sensor located above the catalytic converter before replacing the evaporator purge canister.