Question about 2004 Ford Freestar

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Cleaning the Mass Air Flow Sensor

I have a 2004 Ford Freestar. The check engine light came on. I had the problem code read and received a P0171 and P0174 readout. I was told to either replace or clean the Mass Air Flow sensor. The Freestar has the 3.9 liter engine and I'm not sure where the MAF sensor is located.

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  • 4 more comments 
  • mcollins73 Dec 08, 2008

    Thanks Doc,

    Your "diagnosis" was spot on. Seven bucks for a can of contact cleaner and the check engine light was cleared. Much better than $120 bucks for a sensor.

    MC73

  • Anonymous Mar 20, 2014

    hi emissions problems with my ford truck camshaft and mass air flow sensor comes up when scanned and wrench light comes on when you try to drive then the truck stalls

  • Anonymous Mar 21, 2014

    need to clean

  • Anonymous Mar 23, 2014

    masse air

  • Anonymous Mar 28, 2014

    I have cleaned the MAV valve and sensor

  • Anonymous Mar 28, 2014

    camshaft position sensor

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I will try to help. 171/174 indicates lean condition in engine. the mass air flow sensor is located in the rubber tube going to throttlebody. you can try to clean it. using mild carb cleaner safe for sensors, remove sensor from tube. spray clean the tiny wires located in the cylinder. do not touch them, they are very delicate. these engines are also notorious for leaking intake gaskets and faulty pcv valves. these will all set these 2 codes. feel free with anymore questions.

Posted on Nov 15, 2008

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I have a 2005 mercury Monterey van with a check engine light on. Autozone diagnosed either a mass air flow sensor or O2 sensor problem. I tried cleaning the air flow sensor with air flow sensor cleaner but...


If it is running lean, I'd check correct fuel pressure. Then check for a vacuum leak. 02 sensors are part of a tune-up. I don't like to replace parts unless I'm sure.

I can't rule out a maf sensor.

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Scanned my computer , came up with a PO 171 and 174 what does this mean?


P0171 AND P0174
P0171 - System Too Engine Cylinder Lean Bank 1xicon.jpghttp://engine-codes.com/p0171.htmlForum CodePossible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection Tech notes Dirty air filter of faulty air flow sensor are common causes for the P0171 code of the problem.


P0174 FORD - Fuel Injection System Too Lean Bank 2xicon.jpghttp://engine-codes.com/p0174_ford.htmlForum CodePossible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection Tech notes The codes is usually set when there is an intake leak after the air flow meter, before replacing any parts check for loose or broken hoses and intake gasket leak. On Ford some models dirty air filter, and dirty or faulty air flow sensor are the cause of the problem.

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2004 x-type 3.0 v6 152,000 miles showed codes P0171, P0174, P2096, P2098, P0101, P0171 pd, P1000.


check for vacuum leaks or a faulty mass air flow sensor. all the codes have to do with engine too lean(too much air).

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Where to installe a mass air flow sensor and don't know what it look like.


The mass air flow sensor for this ford freestar is located in the leftside of engine next to battery , in slides into air inlet tubing, i have enclosed a few pictures and a diagram to help you locate it, you will only see the back side of it where the connector goes until you remove it as in sits inside the air tube,hope this is helpful.johnjohn2_149.jpgjohnjohn2_150.jpgjohnjohn2_175.gif

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Check engine light on; engine codes P0171 and P0174


p0171 is lean exhaust bank one ( passenger side) and p0174 is lean exhaust bank 2 ( drivers side). First we need to look for vacuum leaks, low fuel pressure, Intake air leaks after the mass air flow sensor, pvc system. Because you have both sides lean I would start looking at these spots.

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My C230 Mercedes has check engine light on. Car checked and the following codes were found: P0171 system too lean, P0300 random/multiple cylinder misfire, P0301, 302, 303, 304- meaning cylinders 1 - 4...


P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks.Replace MAf sensor,if cleaning the MAF does not help.
Thanks.

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There is no p01001, it's either p0100, or p0101.
Anyway, it's the mass air flow sensor that's bad. The p0171 and p0174 is a lean condition on bank 1 and bank 2, which are the oxygen sensors. Change the mass air flow sensor and that should take care of the p0171 and 74 codes.
The mass air flow sensor can cause the 02 sensors to read lean.
The u1301, is a class 2 circuit short to battery. That, you have to test wires to find with a voltmeter/continuity tester.
I would try and find that short before changing the flow sensor, you don't need the new one shorting out, they are not that cheap.

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--BANK 1 = DTCs P0171 (lean) and P0172 (rich)

-Check intake air system for leaks, obstructions and damage.
-Check air cleaner element, air cleaner housing for blockage.
-Verify integrity of the PCV system.
-Check for vacuum leaks.

I would try cleaning the Mass Airflow Sensor first. A dirty Mass Airflow Sensor is a common problem for triggering PO 171 & 174 codes.

Good luck and keep me posted.

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I have a 1995 ford taurus engine stalls when idling and smells of gas when accelerating it bucks. Changed fuel filter, could it be mass air flow sensor?


Start with smaller problems and check the fuel pressure regulator, the mass air flow sensor for these vehicles is pretty pricy. Is the check engine light on? If so, head to your nearest auto zone and have them check for trouble codes. If the check engine light isn't on, its not likely your mass air flow sensor

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Engine light on mazda tribute 2002


Have it checked again and see what code it is. if it is P0401 it is probably the sensor shown below, The DPFE (Diferential Pressure Sensor)sensor is usually mounted on the engine and is connected to the pipe that runs from the exhaust manifold to the EGR valve with two rubber hoses. When the sensor goes bad, the Check Engine light comes on and typically sets any or all of teh following fault codes: P0171 & P0174 (lean codes), and/or P0401 (insufficient EGR flow). Nine out of ten times, the fault is not a bad EGR valve or a vacuum leak, but a bad DPFE sensor. A replacement costs about $112 at Ford, or about $48 at an aftermarket auto parts store.I hope this helps.

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