Question about 2000 Nissan Quest

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2000 nissan quest, service engine light on, idles rough...

Black smoke, terrible gas mileage, got fault code P0171, system too lean (bank 1) when I took it to advance auto for diagnostic check. They suggested Oxygen sensor (upstream), Where is that located? and is this the first place to start?? thanks

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  • Anonymous Mar 26, 2014

    my light service motor is on for gas level sensor problem how fix this problem?tks

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Check enging light p0325 knock sensor bank 1 or sensor closed loop bank 1 p0135 o2 sensor

Posted on Feb 05, 2009

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Sounds like it , the sensor should be on the exhaust somewhere,whith wires on it

Posted on Jan 06, 2009

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Im getting P0171 code- lean .


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Jan 27, 2016 | Cars & Trucks

2 Answers

2000 Lincoln Navigator - few days ago started idling very rough when truck is at a stop or in park. Service Engine Light came right around time I noticed that it was idling rough when stopped. Following...


P1131 Lack of HO2S-11 Switch ,Sensor Lean
P1151-Lack of HO2S-21 Switch ,Sensor Lean
PO171- System to Lean (Bank 1)
PO174-Systen to Lean (Bank 2)

Fuel Filter -Plugged
Low Fuel Pressure
Evap System -Leaks
Leaks - in ducting,air filter to throttle
PCV -Leaks
Exhaust System -Leaks
O2 Sensors-worn out

Apr 06, 2011 | 2003 Lincoln Navigator

1 Answer

Rough idle vibrates and po171 code service engine soon. jamesrowland9@aol.com


Hi, a Ford P0171 is a LEAN code for cylinder bank 1, and P0174 is a LEAN code for cylinder bank 2. These codes commonly occur on many Ford vehicles, and are set when the powertrain control module (PCM) sees the air/fuel mixture is running too lean (too much air, not enough fuel).
When the Check Engine Light comes on, either one of these codes, or both, may be found when a code reader or scan tool is plugged into the vehicle diagnostic connector. IF the vehicle is driven long enough, typically both codes will be set.
A P0171 lean code for bank 1 is the cylinder bank on the RIGHT (passenger) side of the engine on Ford vehicles with a V6 or V8 engine and rear-wheel drive.


A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance.
Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow (because the EGR differential pressure sensor that monitors EGR flow is faulty and is under-reporting EGR flow).
If the problem is not enough fuel, the underling cause may be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors.

Mar 24, 2011 | Ford Escort Cars & Trucks

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

2 Answers

01 nissan sentra- check engine light on found codes-p0171 system to lean bank 1 p0172 system rich bank 1 exhaust smells like raw fuel vehicle does stall sometimes only at idle at stop lights


hola mi nombre es victor y tengo un nissan sentra y stoy tratando de pasarle emicion pero cuando voy para motor beiculos el carro ensendio un chec engine y me *** los codigos p0134 p0325 p0171 si tiene alguna idea que puede ser mi numero de telefono es 2039790930 y mi correo es victorleiva79@yahoo.com

May 15, 2010 | 2001 Nissan Sentra

1 Answer

I'm getting the check engine light code: P0171 running lean on bank 1 for my 2000 Toyota Echo. Any advice on what this means and the cost of getting it fixed? Thanks for your time and expertise.


Trouble Code: P0171

Fuel System Too Lean (Bank 1)
Possible Causes:


A/FS or HO2S is contaminated, deteriorated or it has failed Air leaks after the MAF sensor, or in the EGR or PCV system Base engine "mechanical" fault affecting one or more cylinders Exhaust leaks located in front of the A/FS or HO2S location Fuel system supplying too little fuel during cruise or idle (faulty fuel pump or fuel filter) Fuel injector (one or more) dirty or pressure regulator has failed Vehicle driven low on fuel or until it ran out of fuel

Jul 23, 2009 | Toyota ECHO Cars & Trucks

1 Answer

Cavalier blowing out black smoke car idles fairly well considerin


Black smoke is usually unburned fuel. P0171 reads bank 1 system too lean. There isn't one answer. You need to dig further and inspect your cars fuel system, from the pump to the injectors. Because of the mileage you may want to start off with a compression test just to see where you stand with the motor. write back if you have any other questions.

Apr 24, 2009 | 1999 Dodge Intrepid

1 Answer

2005 silverado..5.3...motor idle rough.. getting 3 codes


p0171 and o0174 is lean replace intake gasket they will be a teal color,the old ones are red. i work for chevrolet.this is a common problem

Feb 11, 2009 | 2005 Chevrolet Silverado

1 Answer

3.9 v6 4x4 check engine light, runs rough


Replace the ECT sensor.
And letme know. If you feel any diference. ok.

Aug 15, 2008 | 1998 Dodge Dakota

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