Question about 2002 Ford Expedition

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I have a 02 ford expedition that keeps showing fault code 171 [bank 1 fuel system running lean] Do you know what would cause this? Thanks

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Try cleaning the MAF sensor...it's a fairly easy and cheap start. Instructions are here:
http://www.fordf150.net/howto/clean-maf-mass-airflow-sensor.php

If you have the 5.4 engine and the problem persists, I suspect a spark plug or two maybe fouled.

Posted on Jun 25, 2009

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97 ford expedition has a code 171 and 174 bank 1 and 2 lean what do i do to fix this


Code 171 and 174 are for bank 1 and 2 running too lean. The engine has compensated as rich as it can go, and it is still to lean. This does not necessarily mean your mixture is bad, but something (a sensor) is telling the ECM to correct lean. The oxygen sensors alert the ECM to how lean/rich the exhaust is, and then the ECM trips a code. Maybe you have a bad oxy. sensor, but since there are 4 of them (2 per bank), I don't think they could all go at once.

Aug 31, 2013 | 1997 Ford Expedition

1 Answer

2005 expedition code p0171 and p0174


Code 171 is for the fuel system being too lean on bank one, and code 174 is for the same thing on bank two.
Generally the computer can not open the injectors long enough to make the system go rich.
The most common cause is low fuel pressure or a clogged fuel filter.

Aug 26, 2012 | 2005 Ford Expedition

1 Answer

HOW TO FIX CODES 171 AND 174


fault code p0171 is system too lean bank 1.................. intake/exhaust leak. air system MAF/VAF sensor. Fuel pressure/pump , injectors HOS2.

fault code p0174 is system too lean bank 2...................intake exhaust leak, fuel pressure/pump , injector(s) Air system, Hose connectors

hope this helps you

Jan 07, 2012 | 1999 Ford Ranger SuperCab

1 Answer

Getting 171 174 on 1997 expedition found fuel filter clogged installed new one vehicle accelerates better but studders while driving


Trouble code P0171 means: Fuel System Too Lean (Cylinder Bank 1)

Trouble code P0174 means: Fuel System Too Lean (Cylinder 2 bank

Mar 15, 2011 | 1997 Ford Expedition

2 Answers

Error codes po 134 po 153 po 154 po 155 po 171 po 174


PO 134 = 02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 1 SENSOR1)
PO 153 =02 SENSOR CIRCUIT SLOW RESPONSE (BANK 2 SENSOR 1)
PO 154 =02 SENSOR CIRCUIT NO ACTIVITY DETECTED (BANK 2 SENSOR 1)
PO 155= 02 SENSOR HEATER CIRCUIT MALFUNCTION (BANK 2 SENSOR 1)
PO 171= SYSTEM TOO LEAN (BANK 1)
PO 174= SYSTEM TOO LEAN (BANK 2)
I WOULD SAY YOU HAVE FAULTY OXYGEN SENSORS CAUSING THE ENGINE TO RUN TOO LEAN REPLACE THEM AND YOU SHOULD BE BACK IN BUISNESS

Feb 23, 2011 | 2004 Suzuki Grand Vitara

1 Answer

I have 353 and 171 codes. Car has erratic idle and is sluggish on acceleration. Have replaced plugs and wires.


Hi,

The 353 code is howing that you have a ignition coil pack fault.
The 171 code is showing that you have a fuel lean out problem in bank one.

This could be fuel pressure,injector timing,fowl fuel,blocked inlet tract system.

Check these areas out and you should fix your erractic problem.

Thanks

Jason

Jun 19, 2010 | 2005 Ford Taurus

1 Answer

Check engine light on computer codes 171 174 171-HEGO sensor unable of snitch cylinder bank #1 fuel system at adaptive limit (1990 on) code 174 hego sensor snitching too slow, cylinder bank #1 (1990)


switch, we run off snitches. 171 174 banks 1 & 2 Lean. Most likely cause are Upper Intake Manifold Gaskets, failed seals. It's not 1990 on. It's 1996 and on OBD2.

Aug 03, 2009 | 2003 Ford Explorer Sport

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

2 Answers

Oxygen sensor ford expedition p0171


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.

Feb 01, 2009 | 2000 Ford Expedition

1 Answer

Codes #171 & 174


first check out for o2 sensor if its faulty this can show up.but if its proper.Evaporative emission control system leak very small 171 System too lean (bank 1) 174 System too lean (bank 2) 

Jan 05, 2009 | 2004 Ford F150

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