Question about 2002 Ford Ranger Regular Cab

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2002 Ranger 4L v6 engine light stays on. Quick trouble shoot showed both banks were lean. What might be the cause?

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  • Ford Master
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A dirty Mass Air Flow Sensor (MAF) will cause and lean condition and also and dirty IAT will give you a lean condition. If you are using a oil charged air filter like K&N, droplet of oil will make there way to the MAF sensore and IAT causing them to give the wrong readings. You can buy a can of MAF sensor cleaner and clean both sensors. Make sure it's a MAF cleaner and follow the instructions. Good luck and hope this helps. Keep me posted, there are other reasons but this is the most common. 

Posted on Jun 27, 2009

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2002 Mazda MPV P0172 and P0300


-25 LFT? your dealing with a fuel injector that is leaking or not atomnizing, Inspect the fuel pressure vacuum line is fuel coming out of the pressure regulator?

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Code po171 system too leen bank 1


DTC P0171 - System Too Lean (Bank 1)
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC (Diagnostic Trouble Code) is very similar to P0174, and in fact your vehicle may show both codes at the same time.

I would suggest that you take a look at the front oxygen sensor. Typically speaking the oxygen sensor causes this code to appear. Here is the possible cause list from the manual for your car.

Trouble Code: P0171 - Fuel System Lean (Bank 1)

Possible Causes:
Air leaks in intake manifold, exhaust pipes or exhaust manifold
Base engine mechanical problem causing a lean A/F condition
Fuel control Sensor is out of calibration (e.g., ECT, IAT or MAP)
Fuel delivery component fault (clogged filter, low fuel pressure)
O2 element is contaminated, deteriorated or it has failed
Vacuum hose is disconnected, broken, leaking or loose

Hope this helps (remember to rating this answer ans leave us a testimonial comment). Thank you for using FixYa.

Oct 12, 2011 | 2000 Ford F150 Flareside SuperCab

1 Answer

2003 Chrysler Town & Country po171 code


DTC P0171 - System Too Lean (Bank 1)
Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1.

Note: This DTC (Diagnostic Trouble Code) is very similar to P0174, and in fact your vehicle may show both codes at the same time.

I would suggest that you take a look at the front oxygen sensor. Typically speaking the oxygen sensor causes this code to appear. Here is the possible cause list from the manual for your car.

Trouble Code: P0171 (2.5L V6 Auto) - Fuel System Lean (Bank 1)

Possible Causes:
Air leaks in intake manifold, exhaust pipes or exhaust manifold
Base engine mechanical problem causing a lean A/F condition
Fuel control Sensor is out of calibration (e.g., ECT, IAT or MAP)
Fuel delivery component fault (clogged filter, low fuel pressure)
O2 element is contaminated, deteriorated or it has failed
Vacuum hose is disconnected, broken, leaking or loose

Hope this helps (remember to rating this answer ans leave us a testimonial comment). Thank you for using FixYa.

Oct 12, 2011 | 2001 Chrysler Town & Country

1 Answer

P0171 just replaced mass air flow


p0171 is system to lean ( bank 1 ). did you turn off check engine light with a scanner! if not go to auto-zone and they will erase it for free, then you can see if light stays off. There could be a vacuum leak downstream of the MAF sensor.
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Check for a dirty fuel filter and proper fuel pressure. Basically this means that an oxygen sensor in bank 1 detected a lean condition (too much oxygen in the exhaust). On V6/V8/V10 engines, Bank 1 is the side of the engine that has cylinder #1. good-day!!
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    Ford ranger engine codes P0171 &P0174 ?


    Hi hope I can help.
    P0171 mean bank 1 is to lean
    P0174 means bank 2 is lean
    You did not state what engine you have but by your codes you must have the V6 4.0.
    These codes refer to a fuel issue. bank 1 and bank two represent each of your manifolds.
    being you have a V6 you have 2 manifolds.
    Each of your manifold have an O2 sensor in it. That's what is giving the lean reading.
    This does not mean that you have bad O2 sensors.
    They are just doing there job.
    So you should check your fuel pressure with a gauge and make sure your pressure is correct.
    It seams as your fuel pump maybe weak.
    Hope this helps.
    Please leave feed back
    Thank you urnuts73@ FixYa

    Mar 10, 2011 | 2003 Ford Ranger Regular Cab

    1 Answer

    My 2000 Ford Ranger keeps showing codes PO 171 and


    These codes mean that the oxygen sensor is reading too "Lean" on both the left and right cylinder banks and the engine control system can't compensate any further to solve the problem. You may have a dirty or failing Mass Airflow Sensor that is miscalcuating the amount of airflow the engine is taking in which in turn can cause both of these codes to set. If the sensor is reporting less air than the engine is actually taking in then the engine computer will add only the amount of fuel it should based on what it was told by the sensor which will cause both cylinder banks to run "lean". There could be something else going on such as having two bad oxygen sensors [very rare] but I do see these two codes together quite often and usually its the sensor that is causing it. Hope this helps a bit!

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    2003 Ford Ranger 4x4 extended cab- diagnostics checked and got these codes- P0171, P0174, P0300, P0316. Can you tell me what they mean?


    P0171------ system too lean bank#1
    Po174------ system too lean bank#2
    For these 2 codes, try cleaning the maf sensor (mass air flow), that is mounted in the big black hose that goes from the air filter housing to the throttle plate, if it is dirty, that will cause those 02 sensors to send a signal to the computor to lean the air fuel mixture. If cleaning it doesn't work, the sensors will probably need changing.
    P0300---- Random/multiple cylinder misfire
    P0316---- Cylinder misfire at start up---- first 100 revolutions.
    On those 2 codes, you have to do some testing to find out why there is a misfire.
    Possible causes:
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    weak coil pack
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    1 Answer

    Ford windstar check engine light comes on after stopping when starting to get moving again shows p0171 & p0174 codes why??


    P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks. P0174 OBD-II Trouble Code


    Technical Description

    System Too Lean (Bank 2)


    What does that mean?

    Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust.

    Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.

    -----------

    Thanks.


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    My check enging light is on and when I check codes I get lean bank 1 & 2. The truck is a 2000 Ford Ranger with the V6 and auto 2W drive.


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