Question about 2003 Ford Explorer Sport Trac

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2003 ford explorer sport 4.0 and the chk engine light is on and the code reads lean on the left bank.. what can this be ? A vacuum leak maybe ? please help..

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Maybe a clogged fuel injector on that side. use a complete fuel system cleaner, like bg44k, sold at napa's. even stp works if you get the strong stuff. put it in a full tank & drive it out completly. should fix it.

Posted on Jul 18, 2009

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What does code p1131 mean on a 2001 ford taurus


P1131 Ford
P1131 Ford - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1

Repair Importance Level: 3/3

Repair Difficulty Level: 2/3

http://engine-codes.com/p1131_ford.html

Forum Code

Possible causes

- Faulty Oxygen Sensor

- Vacuum leak affecting bank 1 only

- Fuel injector problem bank 1

- Check for cylinder misfire on bank 1

- Engine mechanical condition

Tech notes

Though the Oxygen (O2) sensor, the Engine Control Module (ECM) has detected a lean system, which means that there is either not enough fuel or and excessive amount of air in the system. Start by checking for vacuum leaks.

When is the code detected?

The Engine Control Module (ECM) detected bank 1 oxygen (O2) at its lean limit

Possible symptoms

- Engine Light ON (or Service Engine Soon Warning Light)

P1131 Ford Description

A Heated Exhaust Oxygen (HO2S) sensor indicating rich at the end of a test is trying to correct for an over-lean condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.

Read more: http://engine-codes.com/p1131_ford.html#ixzz3izk89wMu

Aug 16, 2015 | Ford Cars & Trucks

2 Answers

Why do you get code p0171,p0174/


Code 171 means the fuel mixture is too lean on bank one and code 174 is the same thing for bank two. So I doubt the O2 sensors are faulty. Chances are you have a fuel problem, maybe low fuel pressure.

Aug 04, 2014 | 2003 Ford Explorer Sport XLT

1 Answer

I have a 2003 ford winstar and the check engine light is on. The code readings say Bank 1 and bank 2 is lean. What does that mean?


It means both O2 Sensors, are reporting a lean
exhaust mixture. An out of range condition, that
set the check light

Now you need to figure out why--vacuum leak etc.

I would guess you need a repair shop, that can
diagnose that issue

Feb 12, 2011 | Ford Windstar Cars & Trucks

1 Answer

What is code 171 and 174 on a 01 Ford Sport Trac


171 is system too lean (bank 1)
174 is system too lean (bank 2)
you might have a vacuum leak or bad injector o rings

Oct 08, 2010 | 2001 Ford Explorer Sport Trac

1 Answer

I have a 4 liter V6 2003 Ford Explorer ( 2 door). The check engine came on and then it started idling rough. When it idles rough the AC blows hot. Recently it has started stalling when idling at a...


Hello! Most probable cause is a leak in the vacuum line or broken elbow connection to the Positive Crankcase Ventilation (PCV) valve...Check PCV and its vacuum line...Send results...

Guru..............saailer

Aug 27, 2010 | 2003 Ford Explorer

1 Answer

I have two code PO0171 and PO0174 it says my bank 1 and bank 2 are lean is this a problem with my fuel flex?


I have the same codes on my 2003 Explorer 4.0 Liter V6. I was told many things from bad fuel pressure to bad computer. One peice of advice was correct. Bad air fuel mixture caused by a vacuum leak. The leak could be from a bad vacuum hose or the intake gasket. Mine turned out to be a hole in an elbow vacuum hose on the top of the engine, passanger side, near the intake. Fixed and runs great with no more check engine light.

Jan 04, 2010 | 2000 Ford Taurus

1 Answer

P2195 CODE ON 2003 FORD EXPLORER SPORT TRAC 4.O SOHC. I CHANGED OUT ALL THREE OXYGEN SENSORS, AS ADVISED, AND STILL COMING UP WITH P0171, P0174, AND NOW P2195. HAVE ALSO CHECKED ELECTRICAL CONNECTIONS,...


Hello,
Very common concern with the Explorer, Explorer Sport Trac and Ranger with the 4.0l SOHC engine! The upper and lower intake manifold gaskets fail, causing vacuum leaks..It can be Extremely difficult to detect these leaks, because they only leak intermittently (usually in the AM after a cold soak)... As the engine warms up they seal back up! Sometimes the vehicle will idle rough, surge or stall after initial start up, then the symptoms will clear after it gets to operating temperature... Usually there will be no driveability symptoms at all, except the engine light coming on and setting lean codes.. The gaskets have been redesigned to correct this concern..


Bill Andrade Ford Master Technician/ASE Master Technician

Sep 22, 2009 | 2003 Ford Explorer Sport Trac

1 Answer

2003 Ford Explorer-Check engine light with codes lean bank 1 & 2


If you hear air in the engine, there must be a leak somewhere.
Check all the vaccum hoses for bad ones or dissconnected ones. All it takes is a pin hole in these darn emission systems to screw up the whole system.
It could also be a leaking intake manifold gasket.

Jul 13, 2009 | 2000 Ford Expedition

5 Answers

Code #P0171 & code #P0174


Look, man here is the deal:
code p0174 - refer to the front cylinder bank
code p0171 - refer to the rear cylinder bank

Jun 22, 2008 | 2002 Ford Explorer Sport

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