Question about 2002 Ford Escort

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P0171 AND P0174 CODES KEEP RETURNING AFTER ABOUT 2 WEEKS OF REGULAR DRIVING. NO NOTIEABLE RUNNING PROBLEMS. ALSO HAVE A K&N COLD AIR INTAKE THAT CAME WITH TRUCK.

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  • bburke157 Aug 30, 2008

    I keep having the engine ligth come on. I've replace the Mass air flow sensor and both o2 sensors.

  • Anonymous Mar 22, 2014

    runs real roff, cold start, didnt have any problems until water pump was replace. Ben useing alot of gas lately. Change the oil in feb. last ture up in march 2013

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1 Answer

Same, here - P0171. It is found in the teamzx2.com website. It is under "common problems" and I am going to check the pvc valve and its pipe - which is most likely the culprit.


Posted on Aug 31, 2008

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WHAT CAN I DO TO FIX MY AUTO HAVE CODES P0171 P0174 01000 P2195 P2197 WHAT ARE THE CODES.


P0171 & P0174 are lean codes.this can be cause by a vacuum leak. One of the symptoms is a ruff idle when cold.

You can listen for it or you can have it smoke checked by a shop. Most common causes are intake plenum gaskets and rotted PVC hoses.

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Changed the mass air sensor and temperature sensor and I have still have codes p171 & p174 on my 96 thunderbird lx hellp


p0171 p0174 indicate lean ...check for vacuum leaks around intake manifold...spray carb cleaner(or brake cleaner if flammable)around intake manifold..if rpm goes up you have a vacuum leak....fix leak ..clear codes and test drive.....at least two drive cycles

Apr 01, 2014 | Cars & Trucks

1 Answer

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


Smoke testing for codes P0171 P0174 - YouTube

? 5:48
www.youtube.com/watch?v=kZsqEfP-5zM
Jan 18, 2011 - Uploaded by realfixesrealfast Smoke testing for codes P0171 P0174 .... I have a 1995 ford mustang gt 5.0 and it keeps having a Fault code 176 pop up. ....Ford Explorer P0174 code intake air leak check engine light by froggy - Duration: 16:11. by froggy ...

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1 Answer

Ford Taurus Engine Light is: P0171 & P0174. I am thinking a MAF Sensor


Could be a problem with the MAF sensor but if it is you should have a code for that too.
Other causes include low fuel pressure, and a vac leak or air leak in the intake hose to the MAF.
The codes mean the ECM can not make the injectors rich enough to make the O2 sensors switch back and forth.

Jul 29, 2012 | Ford Cars & Trucks

3 Answers

Check engine light with codes P0171 & P0174, hesitation at accelleration 2001 mercury sable.


P0171 & P0174 indicate Lean burning on banks 1 and 2. The most common cause is a dirty or defective MAF (Mass Air Flow) sensor. Other causes are bad fuel filters or a broken vacuum line.

Jul 06, 2011 | 2001 Mercury Sable

2 Answers

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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1 Answer

My daughter has a 2003 Escort ZX2 and check engine light keeps coming on. Mechanic said it is "running lean" so they did all maintenance including new air filter. Light went off for about a...


99% of 'lean' codes P0171, P0174 are caused by a vacumm leak. Check the integrity of the hoses and piping between the intake plenum and the air filter housing. Check the condition of the PCV hose. Check all the little vacumm lines on the intake manifold/plenum for leaks, collapse, oil contamination, and cracks.

Any savvy mechanic should be able to inject UV smoke into the system and find the problem in a matter of minutes.

Apr 20, 2011 | 2003 Ford Escort

1 Answer

I'm getting a DTC of P0171 and P0174. System to lean bank 1 & 2.


your car is probably running rough
its sucking air from the intake mininfold
is your intake maninfold plastic? but your veicle is defenetly having a vaccum problem

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3 Answers

P0171 & P0174 Error Codes


I know this is an old post, but I found the solution for my 01' Yukon P0171 and P0174. I have changed all the vacuum line and the PCV, throtle body gasket, MAF, plugs wires, fuel pressure reg. All was changed and the codes always came back.

I finally noticed the purge valve on the manifold was constantly purging. I replaced the purge valve abnd code has not been back. It was $40.

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1 Answer

P1507 P0171 & P0174 error codes on 02 windstar


p0171 indicates the system is running lean on bank 1,p0174 means the system is running to lean on bank 2 p1507 is an idle speed under run fault i'd suspect an air leak is the cause of your problem check air intake system for airleaks

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