Question about 1997 Buick LeSabre

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My 97 buick stalls some time and wont start for while

My 97 buick i get a code that reads system to lean bank 1 what should i check the maf sensor gas cap fuel filter if the maf is there a way to test it without buying new one first i get code po171 system to lean bank 1

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Code po 171 system lean on bank one on 2002 buick lasabre

Posted on Mar 01, 2009

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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

Posted on Nov 30, 2008

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P0171' p0174 96 buick roadmaster 5.7


System Too Lean P0171
Clean the MAF sensor and IAC valve with MAF cleaner
Inspect all vacuum and PCV hoses, replace/repair as required.
Inspect all hoses and connections in the air intake system.
Inspect and/or test the intake manifold gaskets for leakage.
Check for a dirty fuel filter and proper fuel pressure.

As a last resort, replace O2 sensor

System Too Lean P0174
Error code P0174 is described as System Too Lean (Bank 2). This means there is incorrect ratio of air and fuel on the car's engine system, specifically on Bank 2 of the Cylinder. “Too Lean” means there is too much oxygen in the exhaust.

As a last resort, replace O2 sensor

Jan 27, 2018 | Buick Cars & Trucks

2 Answers

Hello, I have a 2010 BMW X3. Got a P00BC, P0171, and P0174 code. Got MAF sensor changed, but mechanic said when he install the new MAF, he got the same code, so he install my old MAF back.


No mechanic would take an electrical part and install it and then take it back out after it failed to repair the issue. They are supposed to know what part is bad before they do that and he did not use diligence. Unplugging a MAF will not usually kill the engine. IT will produce and error code though. No usually a too lean error.

Jan 03, 2018 | BMW Cars & Trucks

1 Answer

2000 toyota alvalon check engine light keeps coming on for code p0171 after replacing 02 oxygen sensor in bank 1


code p 0171 refers to system too lean bank 1===causes ---intake /exhaust leak---AIR system---MAF/VAF sensor/s---fuel pressure/ pump---injector/s---heated oxygen sensor (HO2S) the one in the exhaust manifold for bank 1 nearest the firewall

Apr 15, 2017 | Toyota Cars & Trucks

1 Answer

Codes 0171 0174, 0316,0430


code p0171 refers to system too lean bank 1 causes---intake exhaust leak--- AIR system----MAF?VAF sensor fuel pressure/ pump injectors HO2S
code p0174 refers to System to lean bank 2 causes the same except Maf and vaf are not mentioned and hose connections are added
code p0316 refers to misfire detected at star up first 1000 revs causes ---engine mechanicval fault---wiring---ignition/ fuel system--injector
code p0430 refers to cat convertersystem bank 2-- effeciency below threshold causes ----cat converter--- wiring ----HO2S. Personally I would chewck the cat converter first as if it is blocking the exhaust system the ret of the sensors will have irregular readings.

Mar 14, 2013 | Cars & Trucks

1 Answer

Engine check light on error code 1 is P0171 system too lean bank 1 error code 2 is P0174 system too lean bank 2


P0171 system too lean bank 1
P0174 system too lean bank 2
links to information on the codes

it means that the O2 sensors in your vehicle detected a lean condition in their respective banks. this could be caused by a dirty MAF (mass air flow) sensor or a vacuum leak downstream from the MAF sensor

sometimes you can clean the MAF with electronics cleaner or brake cleaner but be sure to take it off the vehicle first. be careful not to damage the MAF while spraying the cleaner, and allow it to dry completely before installing it on the vehicle.

May 21, 2011 | 2001 Jaguar S-Type

1 Answer

Speedometer sudenly stoppped working. now works intermittently. also shows check engine light. It is showing p0171 & p0172 codes. Lean and rich. seams like they contradict each other. occasionaly the...


P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks.Replace MAf sensor,if cleaning the MAF does not help.
OBD II P0172 Fuel System Too Rich (Bank 1).P0172 - System Too Rich (Bank 1) Essentially this DTC means that an oxygen sensor in bank 1 detected a rich condition.
When the code says that the Fuel System is "too rich," it means that the computer has been subtracting more and more fuel, which is called Long Term Fuel Trim. Ideally, the Long Term Fuel Trim should be close to 1 to 2 percent. When a code P0172 is set, it means that the Fuel Trim is anywhere from -15 percent to as low as -30 percent compensated. When this happens, the computer knows that there is an improper condition in the control of the Fuel System.


Thanks.

Feb 07, 2010 | 1996 Volvo 850

1 Answer

Codes


Your sensors are reading correctly so leave them alone. What you have is a fuel delivery issue. Your MAF sensor is telling your engine to lean your fuel mixture. You need to remove and clean or replace (is better) the MAF. But first replace your PVC valve and clean your ERG valve.

Jan 20, 2010 | 2000 Dodge Intrepid

1 Answer

My 98 sw1 is running rough.it started last nite.no power/almost stalling but no code set.it set a po171 code on the way home.any ideas(i just have a code reader.)


P0171 (fault Location) System to lean, bank 1 (probable Cause) Intake/exhaust leak, AIR system, MAF/VAF sensor, fuel pressure/pump, injector(s), HO2S

HO2S is Oxygen sensor. MAF is Mass air flow sensor. Any one of these could cause a problem. Is this what your code reader said or does your code reader only read the codes and tells you nothing else?

Jul 31, 2009 | 1998 Saturn SW

2 Answers

4 codes P0171,P0174,P2195,P2197


Hi
171 system too lean
174 system too lean
2195 - 02 ozygen sensor signal stuck lean Bank1 Sensor 1
2197- 02 ozygen sensor signal stuck lean Bank 2
Sensor 1
The 2 front 02 sensors are located on the front of
the exhaust manifold.
Should solve problem and increase gas mileage.

Apr 01, 2009 | 2003 Ford Expedition

1 Answer

Obd code P1131 and PO174


P1131 - Heated Oxygen Sensor (HO2S) Circuit Low Variance Bank 1 Sensor 2
P0174 - Fuel Trim System Lean Bank 2

Clean the MAF sensor and check for vacuum leaks at the intake manfold or the injector O rings.

Nov 13, 2008 | Ford Ranger Cars & Trucks

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