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2001 chevy Tahoe has codes p0171, P0174 I've replaced the fuel filter, spark plugs, air filter, mass air flow sensor and cleaned out the throttle body, but my SUV still idles, dribbles at times and feels like it's going to shut off. What can be wrong??

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  • Expert
  • 151 Answers

Those are codes for bank too lean. Look for vacuum leaks, failed cat converter, exhaust leak, plugged screen on in tank, failing fuel pump, bad fuel pressure regulator, dirty/weak injectors, bad ground,..I'd take it to a shop, a good tech can track it down in under 20 minutes, it's all about the tools.

Posted on May 09, 2014

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Posted on Jan 02, 2017

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bitchn65cuda
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SOURCE: 1996 s10 2.2 engine starts but idles rough and will not rev up.

Hi! You must be frustrated by now! your code is marking that the O2 sensor is bad in bank 1. Did you replace the O2 sensor that is located  before the catalytic converter?  The S10 has an O2 sensor specially made for that cat. its about 30$ That would explain for your blackened spark plugs; your pc on the car is asking for more fuel. GOOD LUCK!!

Posted on Apr 29, 2009

autodr
  • 260 Answers

SOURCE: Cleaning the Mass Air Flow Sensor

i will try to help. 171/174 indicates lean condition in engine. the mass air flow sensor is located in the rubber tube going to throttlebody. you can try to clean it. using mild carb cleaner safe for sensors, remove sensor from tube. spray clean the tiny wires located in the cylinder. do not touch them, they are very delicate. these engines are also notorious for leaking intake gaskets and faulty pcv valves. these will all set these 2 codes. feel free with anymore questions.

Posted on Nov 15, 2008

  • 151 Answers

SOURCE: car runs rough at idle

clean out ur throttle body, just follow the hose from the air filter to the throttle body. Need 2 people to do this. Don't remove the hose completely from the throttle body. Just enuff to be able to spray ur intake cleaner into the throttle body. Do this especially if its worse when the motor is hot, as this would confirm the problem.

Posted on Sep 04, 2008

  • 1 Answer

SOURCE: Mass Air Flow Sensor, oxygen sensor and coil plugs

I have codes 172 & 175 (Fuel trim bank 1 & 2, running to rich) So I was told to replace the Mass Air Flow Sensor. Easy install but very expensive ($150). We'll see if the service engine light comes back on.

Posted on Jun 19, 2009

1fastbob
  • 301 Answers

SOURCE: I have a 1998 ford explorer odb2 codes of p0171

I would first change the fuel filter.

Posted on Oct 18, 2009

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Have code P0171 on 2013 Escape


P0171 FORD - Fuel Injection System Too Lean Bank 1xicon.jpghttp://engine-codes.com/p0171_ford.htmlForum CodePossible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection Tech notes If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced

Nov 05, 2012 | Cars & Trucks

1 Answer

Fault code p0171 what the problem


P0171 - System Too Lean Bank 1
Possible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection Tech notes If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.

Oct 09, 2012 | 2001 Renault Sportwagon

2 Answers

I have a 2001 Jimmy with "Service Engine Soon"


P0171 System too lean bank 1
P0174 System too lean bank 2

Last time you changed your fuel filter?
Look for any vacuum leaks.

Sep 05, 2011 | 2001 GMC Jimmy

1 Answer

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

2 Answers

I have 97 tahoe with the dtc list as: p0171 and p0174,p1345


A code P0171 may mean that one or more of the following has happened:

  • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filter may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
  • There could be a vacuum leak downstream of the MAF sensor.

    Possible solutions include:

    • In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
    • Inspect all vacuum and PCV hoses, replace if necessary
    • Check for a dirty fuel filter and proper fuel pressure.

Feb 09, 2011 | 1997 Chevrolet Tahoe

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

    1 Answer

    I have replaced the port seals, isolater bolts, cleaned the EGR ports, plugs and wires, and chanced the air filter. I was getting both 171 and 174 codes. Now after 60 miles or so, pulled the codes again...


    P0171 is a lean fuel condition . The computer reflashed has nothing to do with it . Vacuum leak intake manifold probably . If both P0171 & P0174 were back could be fuel pump low flow or restricted fuel filter . or O2 sensor problem or mass airflow sensor. Suggest you take it to a qualified repair shop to have it diagnosed .
    Ford 150 P0171 P0174 Trouble Codes vacuum leak water test

    Diagnosing Faulty Mass Air Flow Sensor P0171 P0174 Lean Codes

    Aug 10, 2017 | 2000 Ford Windstar

    1 Answer

    OBDII SETS CODES P0401, P0171 & P0174 . 1998 Mercury Sable


    P0401- Exhaust Gas Recirculation Flow Insufficient Dectected
    Possible causes - Harness or connectors (EGR volume control valve circuit is open or shorted.)
    - EGR volume control valve stuck closed
    - EGR volume control solenoid valve
    - Dead (Weak) battery
    - EGR passage clogged
    - Exhaust gas leaks Possible solution - Clean EGR Valve
    - Repair EGR harness or connector
    - Replaced EGR volume control solenoid valve
    - Replaced EGR volume control valve
    Code 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 Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem 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 Possible solution Dirty air filter of faulty air flow sensor are common causes of the problem.

    Jun 28, 2010 | 1998 Mercury Sable

    1 Answer

    99 chevy tahoe...5.7 po171,po174,po420


    P0171 and P0174 Means engine is running lean-Possible a dirty mass air flow sensor (can be cleaned with brake clean) failing fuel pump, vacuum leak...

    P0420 means your catalytic convertor is failing-time to see your exhaust shop

    May 06, 2010 | 1999 Chevrolet Tahoe

    1 Answer

    99 CHEVY trouble shoot code P0171


    LEAN TROUBLE CODES (P0171 or P0174) A code P0171 or P0174 indicate the engine is running lean. This means there is too much air and/or not enough fuel. You can confirm the engine is running lean by looking at Short Term Fuel Trim (STFT) and Long Term Fuel Trim (LTFT). Normally, STFT and LTFT should be plus or minus 8 from zero. If STFT and/or LTFT are more than about +10 or higher, it indicates the engine is running LEAN. Negative numbers (-10 or more) indicates the engine is running RICH. A lean fuel condition can be caused by:

    * Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (use a fuel pressure gauge to check fuel pressure at idle)

    * Dirty fuel injectors. (try cleaning the injectors)

    * Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

    * Leaky EGR valve. (Check operation of EGR valve)

    * Leaky PCV Valve or hose. (Check valve and hose connections)

    * Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)

    ______________________________-- Causes A code P0171 may mean that one or more of the following has happened:
    • The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
    • There could be a vacuum leak downstream of the MAF sensor.
    Possible Solutions Possible solutions include:
    • In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
    • Inspect all vacuum and PCV hoses, replace if necessary
    • Check for a dirty fuel filter and proper fuel pressure

    Jan 02, 2010 | 2001 Dodge Ram 1500 Truck 2WD

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