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

Replaced gas cap, cleaned maf sensor, replaced 02 oxygen sensor in bank 1, and put additive in fuel. Light still comes on.

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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

Posted on Apr 15, 2017

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Posted on Jan 02, 2017

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P0171 System Too Lean (Bank #1)On a 2000 Toyota Avalon. I have replaced gas cap, cleaned massive air flow sensor. The check engine light keeps coming on.


Gas cap would not have anything to do with a lean code . Your vehicle could have a vacuum leak , videos on youtube showing how to check for a vacuum leak . Or you could have a fuel delivery issue , low fuel volume , a dirty fuel filter , clogged injectors , videos on youtube ,test fuel preesure an flow . Injector testing etc.... Also testing engine sensor data with a professional type scan tool would be adviseable .

Mar 05, 2017 | Toyota Cars & Trucks

1 Answer

P0171 code


A code P0171 may mean that one or more of the following has happened:
The MAF (Mass Air Flow) Sensor is dirty or faulty Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.

There could be a vacuum leak downstream of the MAF sensor

Possible cracked vacuum or PCV line/connection

Faulty or stuck open PCV valve Failed or faulty oxygen sensor (bank 1, sensor 1)

Sticking/plugged or failed fuel injector Low fuel pressure (possible plugged/dirty fuel filter!)

Exhaust leak between engine and first oxygen sensor

Apr 19, 2014 | 2000 Toyota Tacoma PreRunner

1 Answer

P0171 just replaced mass air flow


p0171 is system to lean ( bank 1 ). did you turn off check engine light with a scanner! if not go to auto-zone and they will erase it for free, then you can see if light stays off. There could be a vacuum leak downstream of the MAF sensor.
  • Inspect all vacuum and PCV hoses, replace if necessary
  • Check for a dirty fuel filter and proper fuel pressure. 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. good-day!!
  • Aug 18, 2011 | 2002 Toyota RAV4

    1 Answer

    Ive been having issues with my 2001 tacoma pre runner. The check engine light goes on and off. It read a P0171. I replaced spark plugs and MAF sensor. Light has not come back on again but engine still...


    That code is P0171= system too lean (bank 1). The computer is reading a lean condition and is trying to richen up the mixture but is unable to fully compensate for the condition. That is why the engine is running so rich and you are losing mileage. You should be looking for an air leak in the intake system after the MAF, a vacuum leak into the intake manifold, or an exhaust leak at the exhaust manifold gasket or some where above the oxygen sensor. The O2 sensor is seeing excess oxygen that is unaccounted for by the MAF.

    Feb 04, 2011 | Toyota Tacoma Cars & Trucks

    1 Answer

    2003 Corolla P0171 code check engine light on slightly rough


    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 is very similar to P0174, and in fact your vehicle may show both codes at the same time.

    Symptoms: You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.

    Causes: A code P0171 may mean that one or more of the following has happened:
    * The MAF (Mass Air Flow) Sensor is dirty or faulty. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry.
    * There could be a vacuum leak downstream of the MAF sensor.

    Possible solutions include:
    * In the vast majority of cases, simply cleaning the MAF sensor does the trick. Consult your service manual for it's location if you need help. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling
    * Inspect all vacuum and PCV hoses, replace if necessary
    * Check for a dirty fuel filter and proper fuel pressure


    Hope this helps (remember to rate this answer).

    Dec 08, 2010 | 2003 Toyota Corolla

    1 Answer

    2oo0 chevy blazer cel and code p0171 and p0174


    Depending on the engine it will have between 4 and 2.

    If you had a straight 4 or 6 engine then there would be only 2, one on the exhaust manifold or exhaust pipe and then one just after the catalytic converter.

    If you have a "V" engine (V8, V6) then you have an oxygen sensor on each exhaust manifold and will have a catalytic converter for each bank of the V. There will also be an oxygen sensor downstream of each converter as well. In this case there would be 4 oxygen sensors.

    Oct 05, 2009 | 2000 Chevrolet Silverado 1500

    4 Answers

    1999 Toyota 4Runner - Code 0171


    Code P0171 Means that an oxygen sensor in bank 1 detected a lean condition

    All this means is that one or more of the following happened Your MAF (Mass Air Flow) Sensor is dirty or faulty. The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. There could be a vacuum leak downstream of the MAF sensor. In most cases, simply cleaning the MAF sensor does the trick. Take it off and spray it with some electronics cleaner or brake cleaner. Make sure you are careful not to damage the sensor, and make sure it's dry before reinstalling. Inspect all vacuum and PCV hoses if damaged replace. Check for a dirty fuel filter and proper fuel pressure. Hope this gets you going, Please Rate Me. And you can always Ask Me.wutxtye0rjd9d9ekmodqt1eoxkvn9hr9qjz1l3dabggyud7sdgr36czsrfxqenadhnijx9nfayi+sz1sug0aaaaasuvork5cyii=

    Apr 26, 2009 | 1996 Jeep Grand Cherokee

    2 Answers

    Ford Windstar 1996 Trouble Codes P0171, P0141, P0161, and P0174


    Bank one is toward the front of the vehicle. Sounds like the heated oxygen sensors have gone bad. The Oxygen Sensors are located in the exhaust pipe and require a special socket to remove and replace.

    Jan 16, 2009 | 1996 Ford Windstar

    3 Answers

    Check engine light on a 2001 Toyota Corolla


    No need to replace the MAF. If it was bad, the check engine light would have come right back on as soon as you started the engine. The MAF not only measures the air going into the engine, but also measures the air temperature. Those 2 circuits are constantly sending info the the ECU. If either would fail, the ECU would light the check engine light. P0171 is a common code for incorrect readings (dirty) in the MAF. Cleaning it always helps, and cuts off the light. Your acceleration problem may be either a wrong Air-Fuel sensor (the one before the cat), or an "aftermarket" AF sensor. "Aftermarket" AF sensors have been shown to not work properly in Toyota vehicles. Hope this helps

    Sep 27, 2008 | 2001 Toyota Corolla

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