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What causes and how to fix code PO171. System too lean, bank # 1

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Description : The adaptive fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. Now that we have an Idea of what the codes mean , we need to narrow them down. More than likely the problem is causing both codes to set. Keeping this in mind, lets concentrate on Code PO1309. Of the possible causes listed above I see two Sensors that may throw up a lean code. I would look at the MAF Sensor first and then the Temp Sensor. You may find that if you remove the internal Sensor from the MAF Case that some degree has collected on the thin wire. If you find debree, use a Q-Tip to clean it. DO NOT USE CHEMICALS TO CLEAN IT. If no debree is found, try a Known Good MAF Sensor. Still no fix, move on to testing the rest of the Sensors on the list till you find the problem. Keep in mind that the check engine light will have to be cleared after you have fixed the problem.

Posted on Jun 07, 2011

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We have a Ford Aerostar model 2000. We want to know what these errors are: PO141; PO171; PO174


code p 0141 refers to the heated oxygen sensor (HO2S) 2 bank 1 in the exhaust manifold
check wiring and replace the HO2S unit
code p0171 refers to system too lea bank 1
among the causes is the HO2S which controls the air fuel mixture settings for the ECM so replacing the HO2S for the first will probably fix this code
code p0174 refers to system too lean bank 2====causes for this code include the following
intake / exhaust leak---fuel pressure/pump---injector/s---AIR system---hose connections

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Bank 1 system too lean code po171 how to repair


code p 0171 refers to system too lean bank 1===causes --intake/exhaust leak---AIR system---MAF/VAF sensor---fuel pressure/ pump/ pressure regulator---injector/s---heated oxygen sensor (HO2S unit in the exhaust manifold or before the cat converter
If the engine is running well then consider replacing the HO2S unit as that reports to the ECM that then adjusts the mixture for that bank by altering injector amounts and timing
all the rest affect both banks but the code is bank 1 specific

Sep 18, 2016 | Cars & Trucks

2 Answers

What does code po171 mean.


System too lean, bank 1.

Dec 11, 2014 | Cars & Trucks

1 Answer

What can cause po171 code


code p0171 refers to system too lean bank 1==causes intake /exhaust leak--AIR system--MAF/VAF sensor--fuel pump /pressures--injector/s--HO2S sensor

The easiest one to check is the HO2s sensor before the cat converter in bank 1

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It's turning off engine shaking


code p0171 refers to system too lean bank 1===causes ---intake /exhaust manifold leak---ARI system--MAF/VAF sensor--fuel pressure /pump---injector/s---ECM
code po172 refers to system too rich bank 1===causes --intake blocked---EVAP canister purge valve---fuel pressure---EGR system---injector/s---HO2S

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1 Answer

Check engine light is on codes are po171 system too lean (bank 1) po174 system too lean (bank 2) so what can i do


Look for vacuum leaks,that are causing the O2 Sensors to go lean, and set codes on both banks

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Generic code PO171 system 2 lean bank 1 generic


This can be caused by a faulty mass air flow sensor

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97 Mercury cougar xr7 v6. po443, po430, po171, po174,


Sounds like you have low fuel supply or a leak in intake system causing lean codes, check fuek pressure and volume first. Cat converter effeciancy could be caused by the lean codes, purge system sounds like solenoid failure, check for high resistance accross purge vent solenoid.

Mar 08, 2010 | 1997 Mercury Cougar XR7

2 Answers

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.

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2 Answers

My 97 buick stalls some time and wont start for while


remove maf sensor and check for air filter debris on it, gently blow off debris taking care not to damamge the wires on the sensor. also check forvaccum leaks as this can cause a lean condition

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