Question about 2000 Ford Expedition

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Oxygen sensor ford expedition p0171

How will i know which one needs to be changed and how much will it run me

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This is a lean code bank one the o2 is not the problem it is working because it gave lean code a o2 code would be136 or 138 depending on which one .i would suspect vacuum leak in pcv hose assembly .this a common problem.if you still want to change 02 it will be passenger side upstream 02 which just below exhaust manifold.171 says lean bank one and bank one is the side were #1 cylinder is pass side. i hope this helps and please rate my answer thanks.

Posted on Feb 01, 2009

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Hi, i have a 2000 exp. the code p1131 is on.how do i fix thank you

Posted on Feb 02, 2009

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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

I have a 2001 ford expedition that bogs out when i put it in drive but runs fine in second gear.


DTC P0171 - System Too Lean (Bank 1) and P0174 - System Too Lean (Bank 2)
Basically this means that an oxygen sensor in bank 1 or bank 2 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. Bank 2 is generally the side of the engine that doesn't have cylinder #1.
Note: This DTC is very similar to P0174, and in fact your vehicle may show both codes at the same time.

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.

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 reinstallingInspect all vacuum and PCV hoses, replace if necessaryCheck for a dirty fuel filter and proper fuel pressure

DTC P0155 - 02 Sensor Heater Circuit Malfunction (Bank 2 Sensor 1)This code refers to the front oxygen sensor on Bank 2. The heated circuit in the oxygen sensor decreases time needed to enter closed loop. As the O2 heater reaches operating temperature, the oxygen sensor responds by switching according to oxygen content of the exhaust surrounding it. The ECM tracks how long it takes for the oxygen sensor to begin switching. It the ECM determines (based on coolant temp) that too much time elapsed before the oxygen sensor began operating properly, it will set P0155. See also: P0135 (Bank 1).


You will likely notice poor fuel economy the illumination of the MIL.

A code P0155 may mean that one or more of the following has happened:O2 Heater element resistance is high
Internal short or open in the heater elementO2 heater circuit wiring high resistanceopen or short to ground in the wiring harness

Possible SolutionsRepair short or open or high resistance in wiring harness or harness connectorsReplace oxygen sensor (cannot repair open or short that occurs internally to sensor)


DTC P0161 - Oxygen O2 Sensor Circuit Low Voltage (Bank 2, Sensor 2)It basically means the PCM detected either an excessive current draw, or an open or short in the circuit powering the oxygen sensor's heater circuit. This is in reference to the Heated Oxygen Sensor (2) located rear of catalytic converter (Bank 2).


There will likely be no obvious symptoms other than MIL illumination.


A code P0161 may mean that one or more of the following has happened:HO2S heater power circuit openHO2S heater ground circuit openHO2S signal tracking (due to oil or moisture in the connector)HO2S is damaged or has failed PCM has failed

Possible Solutions:Replace HO2 SensorRepair open or short in power circuitRepair open or short in ground circuitRepair damaged connector due to tracking

Hope helps.

Mar 27, 2012 | 2001 Ford Expedition

1 Answer

What is po171 on a 2000 ford expedition eddie bauer


P0171 - System Too Lean (Bank 1)
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.

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.

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.

If you need additional details about this and other solution details, feel free con contact us clicking in the fault code link.

Hope this helps and just keep in mind that your feedback is important and I'll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa.

Oct 31, 2011 | 2000 Ford Expedition

1 Answer

What is the dianosis of a 2004 Expedition/ with the (dtc) PO171.


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.

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.


Hope this helps.

Oct 03, 2011 | 2004 Ford Expedition

1 Answer

I have a 04 expedition the engine light came on the code read po171 and po174 it die out when I'm at a red light but cranks back up missing bad when it warms up


P0171 - Fuel Injection System Too Lean Bank 1
Possible Causes:
- Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection

P0174 - Fuel Injection System Too Lean Bank 2
Possible Causes:
- Intake air leaks
- Front Heated oxygen sensor may be faulty
- Injectors may be faulty
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Mass air flow sensor may be faulty
- Incorrect PCV hose connection

Jan 14, 2011 | 1998 Ford Expedition

1 Answer

An Engine Light came on the dashboard of my 2003 Ford Windstar.The code came up saying p0171 (Fuel System too lean.(Cylinder bank 1) What does this mean?


P0171=System Too Lean Bank 1,
not cylinder 1,it means the oxygen sensor on the drivers side exhaust was stuck on lean and set a code.
doesn't mean you need to change the oxygen sensor yet,first clear the code and see if it corrected its self.

Dec 16, 2009 | 2003 Ford Windstar

1 Answer

Diagnostic Codes p0171 bank 1, and p0174 bank 2 (too lean)


Those codes are for the oxygen sensors, lean fuel mixture on both banks. Change them, problem with stalling and rough idle should go away.

Apr 23, 2009 | Ford Expedition Cars & Trucks

3 Answers

Mass Air Flow Sensor, oxygen sensor and coil plugs


look for vacuum leaks the last 4 codes are lean codes
primarily lookm at the pcv hose noturious for collapsing

Sep 16, 2008 | 2000 Ford Expedition

1 Answer

2000 Ford explore XLT 4.0 soch


P0171 is System adaotive fuel too lean ( bank 1 )
174 is Heated oxygen sensor switching slow, right side

i do not know what to tell you for the p0171 but the 174's answer is a new oxygen sensor.

Jul 18, 2008 | 2000 Ford Explorer

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