Question about 2002 Nissan Altima

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What does engine fault code po171 system too lean bank 1 mean thanks

Hi
my car engine malfunction light vcabe on the code is reading PO171 system too lean bank 1 .could anyone please tell me what this means thanks

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  • Anonymous Mar 21, 2014

    i have a 2005 chevy impala LS what does error code po171 mean

  • Anonymous Mar 26, 2014

    After driving awhile my check engine light is on my mechanic find the code po171 system too lean bank 1 what was the problem ? Thanks for your time

  • Anonymous Mar 26, 2014

    check engine light came on car started running rough no real pick up had codes read at auto zone po507 420 430 300 they tell me 1 code may have triggered the rest any help

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I think its the oxygen sensor (pre cat) in exhaust

Posted on Sep 23, 2008

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Yeah i have the same problem with my prelude when i put straight pipe exhaust. They said its the OXYGEN SENSOR. if you have the same exhaust pipe, i would recommend putting the catalytic converter back. And reconnect the oxygen sensor.

Posted on Jan 29, 2009

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Po171 po174 code


Lean bank 1 and bank 2 , and throttle actuator system fault. Check reason for lean codes 1st, vacuum leak(s), air inlet boot and hoses, or low fuel pressure / clogged filter. Repair as needed then clear codes and recheck .

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Check engine light is on and when tested shows codes PO174 and PO171


The P0171 means System too Lean (Bank 1) and P0174 means System too Lean (Bank 2).
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FGTech Galletto 2-Master

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Check engine light obd code po171,po300,po302,po303 1997 camry 2.2 ltr.


PO171 OBD2 Code basically this means that an oxygen sensor in bank 1 has 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. The P0171 is one of the more common trouble codes.

his code is triggered by the first downstream (front) O2 sensor. The sensor provides a reading of the air:fuel ratio leaving the engine's cylinders, and the vehicles powertrain/engine control module (PCM/ECM) uses that reading and adjusts to keep the engine running at that optimum ratio of 14.7:1. If something is not right and the PCM cannot maintain the 14.7:1 ratio, but rather there is too much air, it triggers this code.

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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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Ses light on code po102 and po171 2000 buck lesabre


Have 2000 Buick Lesabre custom every time car gets up to operating temp. the engine misses going down the road , also let car sit and idle and it shuts off after about 2 minutes , my code reads PO171 system to lean bank 1, changed co2 censor, mass air flow censor, plug wires, and plugs.

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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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1 Answer

Don't know what system lean bank means.


hi it means you have a lean fuel/air ratio on the cylinders on that side of your engine look for air leaks [hoses gaskets loose manifold bolts etc yates210456

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