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Fuel mixture too lean on both cylinder banks - 2006 Kia Sedona

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Check the large hose from the air filter to the throttle body for cracks.

Posted on Dec 31, 2012

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What is the probable cause(s) of DTC P0171?


Well code 171 means the computer thinks the fuel mixture is too lean on bank one. Bank one is the side with cylinder one.
The problem could be low fuel pressure, or a faulty O2 sensor among other things.

Jun 14, 2015 | 1997 Oldsmobile 88

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HOW TO FIX THIS CODE P 0174 FOR 2002 HYUNDAI SANTA FE


Code 174 means the fuel mixture for bank two is too lean.
Bank two is usually the side with cylinder number two.
The problem could be the O2 sensor or one of the fuel injectors.

Sep 11, 2014 | 2002 Hyundai Santa Fe

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What does it mean when it said to lean bank 1


It means that one side of the engine cylinders are running too lean of a fuel mixture Bank one is the left side of the engine. Put a fuel injector cleaner in the gas tank first. Once it has had time to do its work, test again. If it's still lean, then look at the injectors and the control module for a fix.

May 25, 2014 | 2006 GMC Envoy

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System too lean bank 2 mazda mpv


Code 174 means the O2 sensor is telling the computer the fuel mixture on bank two is too lean and the computer can not make the injectors give enough fuel to make it rich.
The problem could be the O2 sensor, or it really could be a fuel problem.
Bank two is the side with cylinder number 2 on a V6 engine.

Feb 06, 2013 | 2004 Mazda MPV

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Rough idle vibrates and po171 code service engine soon. jamesrowland9@aol.com


Hi, a Ford P0171 is a LEAN code for cylinder bank 1, and P0174 is a LEAN code for cylinder bank 2. These codes commonly occur on many Ford vehicles, and are set when the powertrain control module (PCM) sees the air/fuel mixture is running too lean (too much air, not enough fuel).
When the Check Engine Light comes on, either one of these codes, or both, may be found when a code reader or scan tool is plugged into the vehicle diagnostic connector. IF the vehicle is driven long enough, typically both codes will be set.
A P0171 lean code for bank 1 is the cylinder bank on the RIGHT (passenger) side of the engine on Ford vehicles with a V6 or V8 engine and rear-wheel drive.


A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance.
Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow (because the EGR differential pressure sensor that monitors EGR flow is faulty and is under-reporting EGR flow).
If the problem is not enough fuel, the underling cause may be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors.

Mar 24, 2011 | Ford Escort Cars & Trucks

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Engine code P2187 pops up. Also had miss in cyl 1 but resolved by changing long overdue plugs. Now P2187 comes on again (Lien at idle) Any suggestions before I bring it in. Vehicle has 145K miles. Runs...


P2187 = "system too lean at idle, bank 1"

The problem is in the bank of cylinders that includes cylinder 1. Running too lean at idle can often be caused by an air leak between the mass air flow sensor and the throttle body, a leaky intake manifold gasket, or some other vacuum leak. "False air" is downstream of the MAF sensor so it is not measured. The computer only attempts to add the correct amount of fuel to air that it knows about. It will attempt to compensate for lean mixtures but at a certain point, it will turn on the check engine light.

The miss that you had on cylinder one was caused by two things; the false air leaning out the mixture and a worn plug. You replaced the plug and now that new spark plug is able to fire the lean mixture. But the false air remains to be corrected. Eventually, you'll have misfiring again.

Feb 25, 2011 | 2006 Kia Optima

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Code say ox sensor bank 1 that the motor is running lean i replaced ox sensor , light was out for 10 miles than light came back on


Check plugs see what they look like a lean mixture will look light in color ,compare to the other bank. They need to look all similar,detect a lean fireing cylinder or cylinders on one bank, Could be fuel delivery,from an injector ! Or leaking intake manifold gaskets or bad hoses,leaking vacummn.

Sep 16, 2010 | 2001 Volkswagen Beetle

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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:
dirty/malfunctioning injectors
weak coil pack
fowling spark plugs/wires
Low fuel pressure

May 11, 2010 | 2003 Ford Ranger Regular Cab

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A po171 code came on my scanner i need to know


system too lean in bank 1. clean your mass airflow sensor, replace fuel filter. iff all else fails check you fuel pump.

Nov 06, 2009 | 1998 Ford Contour

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What are the descriptions for these DTC's PO171 & PO174 ?


P0171 - System too Lean (Bank 1)
P0174 - System too Lean (Bank 2)

They have to do with fueling the engine. Usually when a car is running a less-than-optimal fuel mixture, it's traceable to O2 sensors, mass airflow sensor, or sometimes a coolant temperature sensor. These all have a direct effect on the fuel mixture. If your O2 sensors have been in the car for more than 60k miles, I'd change them first, as they have the biggest impact on fuel mixture. I don't know what year your car is, but if it's 95 or older, there is only one sensor per bank of cylinders. If it's 96 or newer, you'll have four - two before the catalytic converters, and two after them. The ones you'd want to change are the pre-cat O2 sensors, closest to the engine. These are used for determining fuel mixture. The post-cat O2 sensors are there for monitoring the cats' efficiency.

Aug 03, 2008 | Chevrolet Chevy Cars & Trucks

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