Question about Ford Explorer

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PO 174 Sys to lean bank1 . PO 171 Sys to lean bank2 for a 2000 ford explorer xlt OH .Cran what part do i need change to get the check egn light off ?

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  • vag01 Sep 03, 2010

    I change the MAF sensor.And the check egn. light didn't go off need more help. Thank-U

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  • Ford Master
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Hi.

The check engine codes reproted are telling you that the mixture has too much air (lean mixture). Test and eventually repair or replace parts that may be contributing to the problem.

Test fuel pump and fuel pressure. If fuel delivery is not regular or if pump is broken you may get a lean code from the O2 sensors. Fuel pressure is tested placing an hand pressure gauge within fuel lines.
Ensure that distribution is OK and that there is no misfire. In that case you should get a msfire code along with the lean code, but you never know the misfire does not get detected by PCM (main computer).
Check air intake and sensors, if the MAF or AIT sensors are not connected or malfunctioning you can get a lean mixture.
Check the vacuum system. If there is a leak, then the vacuum will be sucking air from the leak and this may return a lean code.
Check IAC and EGR valves.

I think I listed all most common factors that can return a lean code from both O2 sensors ( that tells you that the sensors are OK).

Posted on Sep 08, 2010

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Hi


Thanks for using FixYa. Codes PO171 and PO174in your Ford means a bad Mass Air Flow (MAF) sensor as a bad sensor will cause the vehicle not to start. Also these codes indicate a lean fuel mixture. Check for vacuum leaks by spraying carb cleaner around the intake manifold and any vacuum lines. If you do not find any intake leaks, replace the mass air flow sensor. Please do accept the solution if the issue is resolved or post a comment for further assistance.


Thanks
Rylee

Posted on Aug 31, 2010

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1 Answer

PO 171, PO 174, AND PO 506


171 and 174 are Lean mixture warnings from the exhaust oxygen sensors. 0506 is the idle air speed warning. Check for vacuum leaks.

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PO 171 and PO 174


You did not list a vehicle, so here are the generic codes.
Code 171 is system lean bank one and code 174 is system lean bank two.
The computer is getting a signal from the O2 sensors saying the fuel system is too lean, and the computer can not make it rich.
Possible causes are low fuel pressure, vac leaks, EGR valve problems, and so on.

Jul 27, 2012 | Cars & Trucks

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Hesitation while idling and stalling at times when not pressing the gas pedal. Codes PO 171 & PO 174 came up on my friends computer.


Lean O2 Sensor Codes for both banks or sides

If they have 100,000 miles on them, change them
Only the 2 closest to the engine,not the rear monitors

Other wise check for vacuum leaks & misfires

Clean MAF Sensor & Throttle Plate

New Spark Plugs -- nothing fancy, double platinium
OEM Style. NGK are good & oem on some fords

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Please tell me what this means,,, po171 band 1 system too lean and po174 band 2 system too lean, thank you, jill


PO 171--is an O2 Sensor Code for a Lean Condition
on Bank 1 (right side exhaust)

PO 174 -- is an O2 Sensor Codes for a Lean Condition
on Bank 2 (left side exhaust)

You gave us no vehicle
You gave us no drivability issues or
vehicle history,nothing

If the O2's have 100,000 miles on them,change the (2)
closest to the engine. They are most likely worn out
& the switching times are too slow to control injector
pulse width & thus set a MIL Lamp (OBD2 Fault ) on
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You can learn a lot on the internet if you put OBD2 in your
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Jul 15, 2011 | Lincoln Town Car Cars & Trucks

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Error codes po 134 po 153 po 154 po 155 po 171 po 174


PO 134 = 02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR1)
PO 153 =02 SENSOR CIRCUIT SLOW RESPONSE (BANK 2 SENSOR 1)
PO 154 =02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 2 SENSOR 1)
PO 155= 02 SENSOR HEATER CIRCUIT MALFUNCTION (BANK 2 SENSOR 1)
PO 171= SYSTEM TOO LEAN (BANK 1)
PO 174= SYSTEM TOO LEAN (BANK 2)
I WOULD SAY YOU HAVE FAULTY OXYGEN SENSORS CAUSING THE ENGINE TO RUN TOO LEAN REPLACE THEM AND YOU SHOULD BE BACK IN BUISNESS

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Check engine light diagnosis shows PO 171 and PO 174, what does it mean. Someone told me I need to replace the fuel filter and fuel cap, is this true


The system is too lean,this ,most of the time means that the fuel pump pressure is not enough,the fuel pump is going out,but change the fuel filter to see if it is the problem,if the fuel filter does not help,replace the fuel pump.

Feb 05, 2010 | 2000 Ford Explorer

1 Answer

I have a 98 ford windstar with check engine light on the codes are P1537, P1538, PO171 system to lean , and PO 174 what are they?


These are all related:
P1537 and P1538 are BOTH:
Intake Manifold Runner Control Stuck Open
P0171 is Lean Bank #1
P0174 is Lean Bank #2.
On the front of the Intake Manifold there are Plastic Clips. The Clips are currently broken and need to be replaced. Because these are broke the Computer is registering too much Air or not enough Fuel = Lean.
You should be able to purchase these at any auto parts store (call ahead for availablility).
After you replace these, all the Codes should disappear.
Let me know if this helped, or if you have addtional information or questions. Feel free to contact me at FixYa.com!

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I have a check engine light on my 1999 Chev Silverado 4x4 6.0L... he has codes PO 171 sys too lean (bank1) and PO 174 sys too lean (bank2). What do I need to do?


when u have these lean codes at both cylinder banks it means in most cases you have a intake vacuum leak, spray propane around the top of the intake and listen for the engine to change speed or sound, if u hear this u have a vacuum leak.

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PO 171 and PO174 codes but different problem


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2000 Ford explore XLT 4.0 soch


P0171 is System adaotive fuel too lean ( bank 1 )
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