Скачать или смотреть What Do DTCs P0171 & P0174 Mean? Fuel Trim System Too Lean (Bank 1 & Bank 2)

This video will help you determine the meaning of Diagnostic Trouble Codes (or DTCs)
P0171 and P0174.
P0171 & P0174: Fuel Trim System Too Lean (Bank 1 & Bank 2)

Possible P0171 & P0174 signs & symptoms:
Check engine light
Lack of power
Coughing/sputtering
Misfires
Knocking
Pinging
Trouble idling
Difficulty turning over
Outdated control module

Possible P0171 & P0174 causes:
(MAF) Mass Airflow Sensors: https://orly.cc/46E0sx5
Vacuum Testers: https://orly.cc/4lCuPs2
Fuel Filters: https://orly.cc/4gvs6h0
Fuel Pumps: https://orly.cc/4lEspcs
Fuel Injectors: https://orly.cc/4lDzrhB
Oxygen Sensors: https://orly.cc/4hmqLu1


0:00 Welcome Back
0:30 Fuel System Diagnostic
0:45 Cylinders and Corresponding Components
1:30 P0171 & P0174 Possible Issues
1:50 P0171 & P0174 Possible Symptoms
2:30 Driving Recommendation
2:50 Additional Resources

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How To Repair and Diagnose a Lean Fuel System
DIY Code Repair Check Engine Code P0171
DIY Code Repair Check Engine Code P0174

Hey everybody—Reneé here from O’Reilly Auto Parts to talk to you about two common diagnostic trouble codes, or DTCs. Today, the codes I’ll be talking about are P0171 and P0174.
If you haven’t stopped by a store for a free O’Reilly Veriscan diagnostic test, it’s a simple way to get a full readout and recommendations that could help with diagnosis and repair.
Technically speaking, OBD-II fault code P0171 means “Fuel Trim System is Too Lean” in bank 1.
Code P0174 indicates the same issue, but for your bank 2 air-to-fuel ratio.
Bank 1 and bank 2 are just names indicating the banks of cylinders and corresponding components on either side of a V-type engine, with bank 1 being the side that contains cylinder 1, and bank 2 indicating the opposite side. In four-cylinder or straight-six engines, there will not be a bank 2, since there are not two sides to the engine itself.
In practical terms, when you see P0171 or P0174, it means the powertrain control module in your vehicle is receiving information that indicates your engine’s air-to-fuel mixture contains too much air, and not enough fuel. This is referred to as the engine running lean.
These two codes will often show up with P0170 and P0173, which indicate Fuel Trim Malfunctions in bank 1 or bank 2.
P0171 and P0174 can have several causes: a dirty or faulty mass air flow sensor; vacuum leaks from the intake manifold gaskets, vacuum hoses, PCV hoses or other components; a clogged fuel filter or weak fuel pump; an outdated control module that may require reflashing; clogged or contaminated fuel injectors; or faulty or contaminated oxygen sensors.
Besides a Check Engine light, you may also notice a lack of power; coughing or sputtering, misfires, knocking or pinging when accelerating; your vehicle may have trouble idling, or you could experience difficulty with your engine turning over.
Unfortunately, this is a difficult problem to diagnose, and while replacing the oxygen sensor, also called an O2 sensor, may seem like an easy fix, it won’t always solve the problem.

If you suspect this problem could be related to your fuel system, you can perform a fuel pressure test on your vehicle with the fuel pressure tester available in our Loaner Tool program. We also have a video on how to use this tool in our How-To Hub.