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Diagnostic code po171 cleaned maf sensor check engine light still on.. How do I clear check engine light?

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Remove the Negative battery terminal for 1 minute and reconnect, this should reset the stored codes in the ECM.

Posted on Oct 14, 2010

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200 ford expedition diagnostic code P0171


PO171- System too lean (Bank1)

Most likely a failed oxygen sensor on the passenger side,
if you never changed the front or upstream sensors at 100,000
miles, as preventative maintenance

Do both sides,clear codes & if they come back, check for vacuum leaks

Do spark plugs every 3 years, as well as fuel & air filter

Spray throttle body inlet with CRC Throttle Body Cleaner

Spray MAF Sensor with CRC MAF Cleaner

Check Fuel Pressure a rail port with a gauge (38# to 42# )

Nov 18, 2012 | 2002 Ford Expedition

1 Answer

Crank but no start after replacing MAF on 2001 corolla po171


Disconnect the maf and see if it starts, if not the MAF is not the problem.

Jul 25, 2012 | 2001 Toyota Corolla

1 Answer

P 0171 (m)


PO171 refers to "system too lean - bank #1", This means that the upstream oxygen sensor detected too much oxygen in the exhaust. Cleaning out the MAF (mass air flow) housing and sensor will help eliminate the PO171 code. It's also necessary to clean the upper portion of the engine and fuel injectors, to make sure they are not clogged or "fouled." check for vacuum leaks and around intake manifold. spray around manifold with engine running, if it flares up you have a leak. in most cases. cleaning the MAF sensor does the trick !

May 03, 2012 | Jeep Grand Cherokee Cars & Trucks

1 Answer

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


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.

Mar 21, 2011 | 2007 Chevrolet Equinox LS New Cars

1 Answer

Error code po171- system too lean bank 1 error code po137- downstream, left bank downstream & pre-catalyst 02 sensor shorted to ground


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.

Oct 18, 2010 | 2004 Jeep Grand Cherokee

1 Answer

Hi, have rav4 y-reg 2ltr the engine light is on and had car put on machine says system too lean error code PO171 BANK 1 also PO174 BANK 2 can anyone please advise? thanks brian


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.

Sep 08, 2010 | 2004 Toyota RAV4

1 Answer

Check engine light on after getting gas on Code PO174 and PO171 codes


Check and clean gas cap "O" ring, and threads and mating surface in filler neck as well, and re-install cap tightly. If that doesn't take care of it, you may have a vacuum leak to the MAF (Mass Air flow) sensor, or a faulty or dirty MAF sensor, which can be sprayed with some success to clean it with electrical spray cleaner or tuner spray cleaner from electronics store.

Oct 09, 2009 | 2005 Toyota Camry Solara

2 Answers

Code's po171 and p0125


Bank 1 and 2 detecting too lean a condition. Yuck. Per the 1998 official Toyota shop manual for a Sienna, it could be a bad 1) coolant temp sensor 2) bad HO2S (or Fuel/Air sensors) 3) bad mass airflow sensor 4) restricted fuel somewhere (like the fuel filter in the tank! ouch.) First, check to function of the coolant temp sensor. You can pull it and play wiht your stove and boiling water or just buy a Carchip data collector and download the data to your computer to analyze. Second, before you replace that horribly expensive Mass Airflow Sensor, pull it out and *carefully* spray it clean with brake cleaner or an electronic cleaner of some sort. And do NOT touch any of the itty-***** wires inside with anything or you WILL be replacing it. Third, if you have HO2S sensors, you can check the resistance of them using an multimeter to see if they are within spec. I forget exactly but it's something low like 9-12 ohms at 68F. If you have Fuel/Air sensors instead, it's dealer diagnostic time. Fourth, if you suspect fuel pressure or fuel flow issues, I recommend dealer diagnostic time too. My best friend got severely burned (2nd and 3rd degree on 50% of his body) messing with fuel and his VW bug when we were in high school. 25 years later, he is still covered in scar tissue and will be forever.
I hope this helps you

Oct 06, 2009 | 2001 Toyota Prius

1 Answer

Traction control light comes on and Check engine light when accelerating to highway speed.The performance is not affected most of the time. I did an engine diagnostic, and the only code that flashed...


cleaning the sensor may not have fixed problem --also check connections with abs and speed sensors but recheck code and if still maf possible wiring ir sensor failure

Sep 05, 2017 | 1996 Oldsmobile LSS

1 Answer

Car is stalling


PO171 means that the MAF (MASS AIRFLOW SENSOR )sensor is dirty or deffective . Or that there is a leak in the vacume hose leading to the MAF sensor.Try cleaning the MAF sensor with brake cleaner .Be careful not to damage it.Check your Air filter also. Make sure it is clean. the reason the MAF sensor gets dirty is because of the filter. Also look for any leaks in the hose or hoses connected to it.It is located near the top of the air filter...little black box with wires coming out toward the front of the car.

Oct 16, 2008 | 2002 Ford SVT Focus

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