Question about 2000 Oldsmobile Silhouette

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PO171 error code System too lean bank 1

Replaced intake manifold on 2000 silhouette 3.4. now getting error code PO171 system too lean, bank 1Is that an O2 sensor? how to check

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  • Anthony Caprio May 11, 2010

    was the code there before you did the intake?

  • Anonymous Mar 25, 2014

    po171

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Here are some possible causes, I would start with anything related to replacing the intake.

Air leaks in intake manifold, exhaust pipes or exhaust manifold
Fuel control sensor is out of calibration
Low fuel pressure (fuel filter clogged, pressure regulator failure)
One or more injectors restricted or pressure regulator has failed
O2 sensors contaminated, deteriorated or has failed
Vacuum hose is disconnected, broken, leaking or loose

Posted on Jan 28, 2009

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I had this problem. I had a code reader that I got from Costco for $35 and the error key read P2187 and the problem was "System Too Lean at Idle Bank". I talked to my uncle that was a mechanic and he said that it is usually a vacuum hose problem if there is an inconsistent idle as I was experience, especially is it was only at idle. I got a flashlight start the car up lifted the hood and looked at every rubber hose starting at the air filter. There was one that was loosely connect to the nipple, I pressed it down all the way and looked for more possible leaks but that fixed it. I started the car with the code reader twice, and it said "no codes found" both times. Try that first!

Posted on Sep 22, 2009

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1 Answer

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

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

Jan 06, 2014 | 1998 Ford Taurus

1 Answer

My 2000 has codes po171 po300 po 463 po480 what


P0171 =system too lean (bank 1)
P0300 = multiple misfire
P0463 = fuel level sensor circuit high input
P0480 = cooling fan 1 control circuit

Aug 16, 2013 | 2000 Oldsmobile Silhouette

1 Answer

My freestar engine light is on OBD says PO171 what should be replaced


I believe this can be a bad O2 sensor error. It is a lean reading on bank 1. Also what can happen are intake manifold leaks, and stuck Intake manifold runners on 1 side of the engine. For the Manifold runners, these work like a gating system. Some Intake manifolds have 2 chambers, a low and high flow. When the gating runner sticks in the high flow position, too much air enters the engine on Bank 1 during idle or low rpm.
Manifold leaks. Use a spray water bottle and with the engine running, spray the seams of the manifold. A leak will change rpm or stall the engine.
Hope this helps you.

Jun 30, 2013 | 2004 Ford Freestar

1 Answer

Po171 2003 ford transit


p0171 is the code for system too lean bank 1. possible causes intake/exhaust leak--air system maf/vaf sensor-fuel pressure--manifold regulator/ pump--injectors Ho2s Check for leaking rubber hoses. Have a fuel pressure test done and replace the sensor.

Mar 06, 2013 | 2003 Ford Expedition

1 Answer

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

Generic code PO171 system 2 lean bank 1 generic


This can be caused by a faulty mass air flow sensor

Jul 06, 2010 | 1999 Ford Taurus

3 Answers

CODE P0171 KEEPS ON COMING BACK ON,REPLACE O2 AND MAP


Hi Jonah,

I have the same problem and it only propped up after i had my exhaust manifold repaired, do you think the mechanic didnt do the weld it right?

James
2001 Saturn L200

Apr 27, 2010 | 2000 Saturn SL

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.

Nov 06, 2009 | 1998 Ford Contour

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