Question about 2001 Ford Explorer Sport Trac

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Price to fix Emissions

I have a 2001 Ford Explorer Sport Trac and I recently failed the emissions test. The codes are P0171 and P0174. I have noticed that my truck's performance is poor, and is at it's worst now, being that the temperature has dropped and it's so cold. It starts up fine, but I have to push the engine just for the truck to stay running and not to cut off. I was wondering what would be the price range to repair the damages..

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  • andchr Dec 19, 2008

    My check engine light came on. The truck seems to run fine. But a big name repair store wants to replace the EGR Pressure sensor. And they want to replace the DPFE sensor which acording to the parts store its the same as the EGR. I watched and each time the clerk put in the word DPFE the EGR pressure sensor came up. Is that correct? I am so confused.

  • goodoldpapa Feb 26, 2009

    My stepdaughter had the same problem with the codes. In her case it wound up being the DPFE sensor malfunctioning. Replaced it and the check engine light hasn't been on since. This has been about a year ago. Around $180 for part & labor.

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BEFORE YOU CAN ESTIMATE THE COST YOU WILL HAVE TO FIND OUT WHY THE TRUCK IS RUNNING LEAN, IT COULD BE FUEL PRESSURE, AN INTAKE MANIFOLD VACUUM LEAK AND SO ON, THEY WILL MOST LIKELY THEY WILL QUOTE YOU 2 HOURS LABOR TO START AND DIAGNOSTICS, OR ABOUT $200

Posted on Dec 04, 2008

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How do I pass emissions with my 1997 does explorer XLT P0


The recommended repair for both the P0171 and P0174 codes is to clean the MAF sensor. Ensure you use the proper cleaning solution, as there are many that will damage the sensor. Buy a cleaner that is made specifically for MAF sensors. The P0420 code will probably clear up if the MAF sensor clears the other two codes.

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If the P0171 is combined with the P0174 code, it's very likely that the problem is caused by an intake leak. If there are no intake leaks, the next step is to replaced the air filter and clean the air flow meter. If the problem persist the front oxygen (O2) sensor may need to be replaced.

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What are the probable causes of DTCs P0171, P0174, and P0455?


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My ford explorer sport trac 2001 shows codes 455 and 457, check engine on


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A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
Other leak or damaged piece in EVAP system

Possible Solutions:
With a P0455, the most common repair is to:
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Otherwise, replace the gas cap, and/or Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary.

P0457 can set by itself if the gas cap is left loose. when the engine controller sees a large increase in fuel level it knows you put some in the tank, and it runs the evaporative emissions system test to see if the system is sealed. If it sees a large leak it knows the cap was left off and sets the P0457. If you are positive the cap wasn't left even a little bit loose you may have a leak back there. It could be in the filler neck, from the tank to the evaporative emissions canisters, and from there on up to the purge solenoid. If you don't see any leaks you probably have a bad NVLD, the unit that checks the system for leaks.

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1 Answer

I took my cadillac catera for an emissions test and it failed. They said it failed due to these to codes: P0171 and P0174. What do the codes mean?


Diagnostic Test Code (DTC) P0171 and P0174 are both "LEAN OXYGEN SENSOR" codes. One is for one side of the engine and the other is for the other side of the engine.

To put it simply, you have too much oxygen in your exhaust on BOTH sides of the engine at the same time.
This can be caused by a number of things including vacuum leaks, low fuel pressure, or a bad Manifold Absolute Pressure (MAP) sensor or Mass Air Flow (MAF) sensor.
This should be diagnosed using a scan tool that can read fuel trim data so that an effective repair can be made and verified.

Please note that it is HIGHLY UNLIKELY that these codes are being caused by the oxygen sensors themselves.

Please also review this article:
What Else Could Be Wrong?

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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

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1 Answer

Failed Emision test


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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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