Question about 2004 Ford F150

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Failed inspection on 2004 Ford F150,heritage series ; Fault Code; P0174: System too Lean.I changed PCV valve and Hose to valve cover gasketbut still failed inspection.Please Help

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Have you checked for any small vacuum leaks on any of the emissions hoses? A vacuum leak causes a "too lean" reading. If no leaks, you could have a malfunctioning emissions valve, bad oxygen sensor or fuel injection problem. First I would remove the spark plugs to see if they verify that you have a lean condition. Lean plugs will look white. Google for an image of what a lean burning plug looks like if you like. If they look like burning lean then proceed to trouble shoot each possible area. For example if only one plug shows lean but the others don't you know to look at the injector for only that one cylinder. So don't mix up which plug came from which cylinder.

Posted on Sep 12, 2009

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2 Answers

2004 freestar dies when stopped and has codes p0171 and p0174 what could it be?


P0171 system too lean bank 1
P0174 system too lean bank 2

You aren't getting enough fuel to keep car running and the system shuts car down

Oct 06, 2016 | 2004 Ford Freestar

2 Answers

Obd code system to lean bank 1&2


Lean on Bank 2 means one side of the engine is getting less fuel or too much air. I also own a 4.0L and I work on these models for this code consistantly. Usually if you have a vacuum leak at the pcv valve hose behind the throttle body you will get a lean Bank 1 and 2.
My recommendation in these cases would be to change the PCV valve (helps with your gas milage) and the fuel filter; other than that you will have to be sure the fuel pressure is correct and there is no vacuum leaks on the driver side of the engine. I am 90 percent sure the fuel filter, pcv valve and clearing the codes will correct this issue.

Here I find one TSB...
MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED - SYSTEM LEAN DIAGNOSTIC TROUBLE CODES (DTC'S) - SERVICE TIPS

FORD:
2000 Contour
2000-2002 Escort
2000-2003 Escort ZX2
2000-2004 Crown Victoria, Focus, Mustang, Taurus
2002-2004 Thunderbird
2000-2003 Windstar
2000-2004 Econoline, Excursion, Expedition, Explorer, F-Super Duty, Ranger
2001-2004 Escape
2004 Freestar
2000-2004 F-Series

LINCOLN:
2000-2002 Continental
2000-2004 LS, Town Car, Navigator
2002-2003 Blackwood
2003-2004 Aviator

MERCURY:
2000 Mystique
2000-2002 Cougar
2000-2004 Grand Marquis, Sable, Mountaineer
2004 Monterey

ISSUE: This article is intended to aid in diagnosing DTC's P0171, P0174, P1130, P1131, P1150, P1151, P2195, or P2197 (system lean or lack of HEGO switches) when a vacuum leak is present. HEGO sensors, MAF sensors, and PCM replacements are not an effective repair when a vacuum leak is causing the above DTC's.

ACTION: Perform the following inspections/repairs when the above codes are found in memory. Procedure provides instructions on how to make comparisons of the total fuel corrections (using scan tool or equivalent) at idle and high RPM's to help determine if a vacuum leak is the root cause of the DTC's.

SERVICE PROCEDURE:
NOTE FREEZE FRAME AND ADAPTIVE FUEL VALUES (ASSOCIATED WITH "LONGFT" PID) WILL NOT BE AVAILABLE IF A KAM OR OBDII RESET WAS RECENTLY PERFORMED.

NOTE FREEZE FRAME DATA WILL INDICATE THE ENGINE AND AMBIENT CONDITIONS WHEN THE DTC WAS SET. THESE ARE IMPORTANT BECAUSE THE VACUUM LEAKS MAY OCCUR ONLY WITHIN SPECIFIC TEMPERATURE RANGES AND MUST BE DUPLICATED TO DETECT THE LEAK.

NOTE FUEL TRIMS AT IDLE ARE PARTICULARLY SENSITIVE TO VACUUM LEAKS SINCE THE UN-METERED AIR LEAKAGE FLOW IS A HIGHER PERCENTAGE OF TOTAL AIRFLOW AT IDLE THAN AT PART THROTTLE. THE BAROMETRIC PRESSURE (BP) PID IS NOT RECOMMENDED TO VIEW WHEN DIAGNOSING A VACUUM LEAK. BP IS AN INFERRED PID CALCULATED DURING HIGHER ENGINE LOADS.

Jan 20, 2012 | 1996 Ford Explorer

2 Answers

Codes171 174


Do you mean codes P0171 and P0174? The 4.6L and 5.4L engines have problems with the rubber boot that connects the PCV tube to the back of the air plenum assembly. The rubber boot deteriorates and gets hols in it which causes lean O2 Sensor codes on both banks. The PCV Valves themselves also fail, causing the same codes. (These are the most common causes) The second most common cause is a malfunctioning MassAirflow Sensor (MAF). Severalother things can cause these two codes including any vacuum leak that is on the engine side of the mass airflow sensor, including holes in the intake "snorkel", intake manifold leaks, or any vacuum suply hoses leaking, including the brake booster hose or even a leaking brake booster. Low fuel pressure, caused by any one of several reasons, can also cause these 2 codes. Clogged injectors can also cause these codes, but are not likely to set both of these codes at once. (although it is possible) The least likely cause (although possible) is that both upstream O2 sensors have failed.

Jan 16, 2011 | 2004 Ford F150

1 Answer

Failed OBDII Diagnstic trouble codes P0761 and O1744 What does this mean?


code P0761-
Possible causes - Low transmission fluid level
- Dirty transmission fluid
- Faulty shift solenoid 3 valve
- Shift solenoid 3 valve harness or connectors
- Shift solenoid 3 valve circuit is open or shorted
P0761 FORD Description Shift solenoid valve 3 is turned ON or OFF by the Transmission Control Module (TCM) in response to signals sent from the park/neutral position (PNP) switch, vehicle speed and Engine Control Module (ECM) (throttle opening). Gears will then be shifted to the optimum position. When is the code detected? The P0761 code is detected when the ECM has detected a mechanical fault with the solenoid energized, valve stuck off code O1744- is not a code these are the ones I have found that come close
P0174 1999 FORD WINDSTAR Fuel Injection System Too Lean Bank 2 P0174 2000 FORD WINDSTAR Fuel Injection System Too Lean Bank 2 P0174 2001 FORD WINDSTAR Fuel Injection System Too Lean Bank 2 P0174 2002 FORD WINDSTAR Fuel Injection System Too Lean Bank 2 P0174 2003 FORD WINDSTAR Fuel Injection System Too Lean Bank 2 P0174 FORD Fuel Injection System Too Lean Bank 2

Sep 28, 2010 | 1999 Ford Taurus

3 Answers

2004 Ford F150 5.4l XLT 4x4. P0174 - Can't resolve! :(


Short of actually getting my hands on your truck to do the diagnosis myself... These are the things I can think of off-hand that would cause your P0174 and not necessarily set other DTCs.

- A faulty upstream Bank 2 O2 sensor or wiring (though you already have this base somewhat covered and Ford O2 sensors are tough, usually don't see failure except in cases of contaminated fuel or excessive use of over-the-counter fuel additives)

- A bent, disconnected, or broken Intake Manifold Runner Control rod or butterfly assy on Bank 2

- An exhaust leak on Bank 2 (esp. since you mentioned headers)

- An intake manifold leak either at the gasket or injector o-rings on Bank 2

- A weak or partially stopped-up injector(s) on Bank 2. Though I find this unlikely since you mentioned there was no misfire.

- A plugged or restricted Catalyst on Bank 2. Also seems unlikely given that you do not experience misfire or low power concerns.

- A faulty Powertrain Control Module. This option, though not unheard of, is VERY unlikely in my experience with these trucks.

If I think of anything else I will let you know. I wish that I could help more, remote diagnostics without all the needed tests and information on a problem such as this amounts to little more than conjecture.

Feb 04, 2010 | 2004 Ford F150

1 Answer

I have a 2004 f-150 5.4 liter with 100,000 niles


When was the last tune-up?

Inspect few plugs for carbon ash (lean running) or wet (rich running).

Clean Mass Air Flow sensor with CRC Mass Air Flow Sensor cleaner

Change air filter

Change PCV valve (under $10 item)

Ran a tank of Chevron gas with LUCAS fuel system cleaner additive.


Inspect for vacuum leak.
Start from the brake booster (round metal drum) and work you way outward.

Jan 27, 2010 | 2004 Ford F150

1 Answer

Check engine soon light on ,throwing code p0174 running lean on bank 2, on a f150 pickup. what would cause this?


Engine size???? The most common cause for that code is a PCV line leaking vac. Check the PCV line form the right valve cover, to the back of the intake manifold. Where the line hooks to the manifold is a rubber connector, and thats where they leak. Note the number thats on the line, the dealer will need that as there are 20 different PCV lines. If the line is ok, you have different problems and a repair shop will need to ck it for you.

Dec 18, 2009 | 2001 Ford F150 Styleside SuperCrew

3 Answers

2004 ford f150 Heritage.I cannot find the PCV valve location?


The PCV valve is located on the passenger side valve cover towards rear of engine.

Sep 05, 2009 | 2004 Ford F150

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

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