Question about 2000 Ford Windstar

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CODES P0171 & P0174 EMISSION SYSTEM SERVICE

I HAVE THE CODES P0171 & P0174 WITH MY CHECK ENGINE LIGHT ON. MY MECHANIC BUDDY HAS REPLACED THE UPPER GASKETS AND UPPER MANIFOLD AND STILL GIVING SAME CODES. WE HAVE REPLACED ONE O2 SENSOR; SPARK PLUGS; UPPER GASKETS; AND UPPER MANIFOLD. MY MECHANIC BUDDY IS STARTING TO GET FRUSTRATED AND WE WERE JUST HOPING IF ANYONE ELSE HAS ANY OTHER SUGGESTIONS. IT ALSO SAYS EMISSION SYSTEM SERVICE RECOMMENDED. WE ARE JUST LOOKING FOR ANY OTHER IDEAS OF HOW TO FIX THIS. HE PLANS ON CHANGING THE LOWER GASKETS TONIGHT. IF THAT DOESNT WORK WE HAVE NO IDEA WHAT TO DO!!!

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  • joe12251979 Mar 13, 2009

    I too Have the same problem. I Have a 97 Explorer With the OHV 4.0. I have replaced the MAF, Intake gaskets, DPFE Sensor, Idle Air Control Valve. I am Stuck too. I know I need a new Mechanic, But I am at a total loss for what else to look for. Please help, this has been going on for 6 months, and I have to go through emissions so I have to get it fixed.. Thank you



    Joe12251979@hotmail.com. Please email me if you can offer some help

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If you have the 3.8 liter its more than likely bad intake manifold gaskets or a cracked manifold. Ford has had several TSBs on this issue. O2 sensors do not go bad as often as mechanics say they do. I have a 1999 that after 100 dollars at the parts store solved all lean conditions on the top end. The manifold has three parts to it. A lower aluminum that houses the butterfly blades for the variable intake runners( known vacuum leak were rods protrude at passenger side of lower bad bushings likely cause). Middle riser which uses oring seals which dry out and cause major vacuum leaks. upper is more or less the top cover which uses one large oring to seal. Hope this helps!

Posted on Apr 18, 2009

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Just clean the MAF (Mass Air Flow) sensor with brake parts cleaner or electronics cleaner. Real easy. Your MAF is very easy to get to. Get a new mechanic buddy.

Posted on Mar 06, 2009

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Your OBD codes indicate a lean signal on both banks. (I'm assuming you have a 3.0L) Bum O2 sensors could do this. Other ideas might be to check for air leak in the exhaust as well as intake. (Your buddy did a thorough job on air inlet) Did he check PCV, EGR and around the throttle body. Some of the exhaust gaskets can go slightly and mess up the O2 signal. Good luck guys. (Been there!)

Posted on Feb 06, 2009

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3 Answers

Check enging is on---OBD code is PO171 & p1443---how do i fixed this problem


The most likely cause of these two codes tripping together is a vacuum leak associated with the canister purge system. This system collects the vented gasoline vapor from the fuel tank and when the engine is running purges the canister into the manifold.

The P0171 is an indication that the engine is running lean and the P1443 is a fault associated with the Purge Control Valve Solenoid trouble code control valve.

Inspect under the hood for a disconnect vacuum line.

The photos are examples of the vacuum circuit connect via hoses. Listen for a vacuum leak when the engine is running. It would be a whistle sound. Also if work has been done recently look in the area that the work was done under the hood.

26150454-uk2ysmhepcorsq0r4fy0hyob-4-0.jpg

26150454-uk2ysmhepcorsq0r4fy0hyob-4-2.jpg Hope this helps?

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1 Answer

Im getting P0171 code- lean .


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4 Codes in computer


code p0128 indicates a mechanical fault ( could be the thermostat stuck open)
code p0174 -system too lean -bank2 ===causes --intake /exhaust leak--fuel pressure/pump--injectors--AIR system--hose connection/s
code po171 refers to system too lean bank 1 same as po174 with the HO2S sensor being the culprit. As to all being related . only by way of the o2 sensors
code p0442 is not connected to the first 3 as it is in a different section of the fuel system

Apr 09, 2014 | 2003 Saturn VUE

1 Answer

P0068, P0171, and P0446 and new ones down below


-I hate to say that but absolutely NO. If you don't know much about car. All these codes are emission code.
P0068 Mean Throttle position sensor.
P0171 Mean system too lean.
P0446 Mean evaporator emission control system has not correct flow
P0507 Mean Idle air control is too hight.
P0116 Mean engine coolant temperature.

Need to have a mechanic to check one by one to determine which part is effect before replace it.

Good luck

Mai Lor

Mar 25, 2014 | 2006 Kia Rio

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 ...

Sep 27, 2013 | 1999 Ford Explorer

2 Answers

I have a 2001 Jimmy with "Service Engine Soon"


P0171 System too lean bank 1
P0174 System too lean bank 2

Last time you changed your fuel filter?
Look for any vacuum leaks.

Sep 05, 2011 | 2001 GMC Jimmy

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.

May 23, 2011 | 1998 Ford F150 Regular Cab

1 Answer

Ford windstar check engine light comes on after stopping when starting to get moving again shows p0171 & p0174 codes why??


P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks. P0174 OBD-II Trouble Code


Technical Description

System Too Lean (Bank 2)


What does that mean?

Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust.

Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.

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Thanks.


Dec 17, 2009 | 2002 Ford Windstar Cargo

1 Answer

Engine service light illuminated. Diagnostic revealed P0171 and P0174 what does that mean?


code P0171 P0174?? sorry these are not nissan codes but the code readers own codes so return to where the reading was done and ask them

Dec 14, 2009 | 2000 Nissan Maxima

4 Answers

P0171 and p0174 codes


P0171 System too Lean (Bank 1)
P0174 System too Lean (Bank 2)

If a car has a check engine light on and has P0171 and P0174 codes stored, the most likely cause is a vacuum leak. These codes are set by the car’s computer when it sees too much oxygen in the exhaust. Excessive oxygen readings in the exhaust will set lean codes. This does not mean that the oxygen sensors are defective. It is a common mistake for people to replace oxygen sensors when lean codes are present. Just because the code is related to oxygen sensor readings, it doesn’t mean that the oxygen sensors are bad. If both of these codes are stored this means that both banks of the engine have excessive oxygen in the exhaust. If the oxygen sensors are replaced it’s most likely that the same codes will reappear. It is very uncommon for two oxygen sensors to fail at the same time.

Therefore the most likely cause of P0171 and P0174 codes is a vacuum leak. The source of a vacuum leak can be one of many things. The most common cause of a vacuum leak is a leaky hose. Vacuum hoses over time can become dry and brittle. The rubber deteriorates and can leak causing a vacuum loss. Many times a leaky vacuum hose can be found by listening for a hissing sound. A large vacuum leak can even make the car run rough at idle. In some cases it will not idle without feathering the gas pedal.

Sep 10, 2009 | 2002 Jaguar X-Type

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