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Keep getting codes po171 and 174 bank 1 and 2 system too lean changed mass air flow, intake gasket, plugs and boots still getting the same codes can anybody help

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Hi! Have you tried adjusting the TPS (throttle position sensor)? Try it and see how it goes. Hope this helps and have a good one!

Posted on Jul 16, 2010

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Im throwing code p0171 bank 1 system too lean changed plugs fuel filter cleaned maf sensor swapped bank1 and bank 2 upstream 02 sensor to c if code red diff but it didnt and sprayed carb cleaner all over...

Your problem is the mass air flow sensor is bad theat code is miss leading a p0171 and p0174 are both miss leading replace the mass air flow sensor and clear the codes.

May 10, 2011 | GMC Sierra 1500 Cars & Trucks

1 Answer

02 stratus, 3.0, Code PO171, Lean on # 1 bank? Could this be something "other" than injectors?

It would help if you could get the car scanned with vag-com, it will show the full fault code.

P0171/ Fuel Trim; Bank 1: System Too Lean
Possible Causes

* Mass Air Flow Sensor defective

Possible Solutions

* Check Mass Air Flow Sensor
* Check Fuel Pressure Regulation
* Check Fuel Pump
* Check Injectors
* Check Intake System for Leaks
* Check Exhaust System for Leaks
* Check Secondary Air System for Leaks
* Check Vacuum Pipes for Leaks

Mar 16, 2011 | 2002 Dodge Stratus

1 Answer

I have a code reader and the code is P0171 P0174 System too lean. what makes the system too lean?

P0171 - Fuel Injection System Too Lean Bank 1
Possible Causes:
- Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection

P0174 - Fuel Injection System Too Lean Bank 2
Possible Causes:
- Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection

What Causes These Codes: Fuel injection system does not operate properly. The amount of mixture ratio compensation is too large. (The mixture ratio is too rich.) The Powertrain Control Module (PCM) monitors the engine Air/Fuel mixture ratio, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The PCM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios. In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the PCM judges the condition as the fuel injection system malfunction and light up the engine light. The codes is usually set when there is an intake leak after the air flow meter, before replacing any parts check for loose or broken hoses and intake gasket leak. On Ford some models dirty air filter, and dirty or faulty air flow sensor are the cause of the problem.

Jan 16, 2011 | 2000 Ford Explorer

2 Answers

What are these codes and how do I fix them? P0101 P0171 P0174

  • P0101 - Mass Air Flow (MAF) Sensor Performance
  • P0171 - Fuel Trim System Lean Bank 1
  • P0174 - Fuel Trim System Lean Bank 2
  • Would start with the mass air flow sensor the other two codes may have been triggered by the performance of the MAF sensor. Is the vehicle running poorly or have high or low idle?

    Nov 03, 2010 | 2004 Chevrolet Tahoe

    2 Answers

    1999 gmc yukon obd11 codes po101 po171 po174 po429 what could be the causes

    ok heres problem 101 is mass air flow sensor 171 running too rich 174 running too lean can find 429 but it the same lines i believe take out your mass air flow sensor and clean it check it connection if comes back on replace the mass air flow sensor

    Sep 24, 2010 | GMC Yukon Cars & Trucks

    1 Answer

    Generic code PO171 system 2 lean bank 1 generic

    This can be caused by a faulty mass air flow sensor

    Jul 06, 2010 | 1999 Ford Taurus

    3 Answers


    Hi Jonah,

    I have the same problem and it only propped up after i had my exhaust manifold repaired, do you think the mechanic didnt do the weld it right?

    2001 Saturn L200

    Apr 27, 2010 | 2000 Saturn SL

    1 Answer

    Service engine soon light on, says bank 1 and 2 lean

    this code sets when more air is entering the system than is designed to. the computer is having to overcompensate by adding more fuel. usually this code is associated with a vacuum leak, either a vacuum hose or a leak at the throttle body gasket, intake gasket, or another gasket on the intake manifold. if your vehicle has a mass air flow sensor (as opposed to a MAP sensor) a dirty or faulty mass air can cause both banks to be lean

    Feb 20, 2010 | 2004 Suzuki XL-7

    2 Answers

    Code 171 and engine light is on

    --BANK 1 = DTCs P0171 (lean) and P0172 (rich)

    -Check intake air system for leaks, obstructions and damage.
    -Check air cleaner element, air cleaner housing for blockage.
    -Verify integrity of the PCV system.
    -Check for vacuum leaks.

    I would try cleaning the Mass Airflow Sensor first. A dirty Mass Airflow Sensor is a common problem for triggering PO 171 & 174 codes.

    Good luck and keep me posted.

    Oct 21, 2009 | Chevrolet Colorado Cars & Trucks

    1 Answer

    Check engine light keeps coming up with same OBD-II codes

    if they did not replace the front valve cover with a new updated one when they did the intake the code will come back.there is a tech service bulletin about this . your mass air flow sensor can be cleaned but would recommend a shop do this.

    Feb 01, 2009 | 1999 Ford Windstar

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