Question about 2000 Ford Econoline

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Code po174 and po171. At idle after a high speed the motor revs up and down.

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6ya6ya
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Posted on Jul 23, 2008

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3mac
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SOURCE: 1995 Windstar OBD II showing codes PO340, PO171, and PO174.

Symptoms of a faulty Camshaft Position Sensor can include hard starting (or no starting), rough running/misfiring and/or loss of power.

Code 340 COULD be caused solely by a faulty Camshaft Position Sensor. However, this code refers to the entire circuit. So, replacing the sensor may not fix the issue. The problem could lie in any part of the circuit - the sensor itself, the wiring, or the PCM.

Codes 171 and 174 typically appear together. They are caused by the 02 sensors reading too much air (lean) in the exhaust. In most cases, simply cleaning the MAF sensor does the trick. I typically take it off and spray it with electronics or brake cleaner. Just make sure it dries before reinstalling. If this doesn't eliminate the codes, inspect all vacuum and PCV hoses, check for a dirty fuel filter and ensure the furl pressure is within limits.

For clarification, the first trip to the shop your car showed codes 402, 732, 733, 171 and 174. After changing the DPFE/EGR, did ALL those codes go away and now only codes 340, 171 and 174 exist? Or do you have the second set of codes in addition to the first codes?




Posted on Jan 15, 2009

  • 1 Answer

SOURCE: 1999 ford windstar 3.8 eng miss

remove the plenum take out injectors have them rebuilt change your plugs should clearup problem.  
ps if you have blowby problem could come back in a few months of driving.

Posted on Jun 01, 2009

  • 842 Answers

SOURCE: Generic code PO171 system 2 lean bank 1 generic

This can be caused by a faulty mass air flow sensor

Posted on Jul 09, 2010

  • 518 Answers

SOURCE: check engine light with codes

Both codes are system too lean bank 1 & bank 2. Most likely a vacuum leak. Check all vacuum hoses for broken, kinked, collapsed or missing.

Posted on Nov 02, 2010

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2 Answers

My 2001 mercury sable will not start and has codes PO171 and PO174


The codes mean the fuel system mixture is too lean. The most common cause is low fuel pressure.

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PO171 and P1131 point to lean codes on bank PO174 and P1151 point to lean code on bank PO305 is missfire on cyl 5

the lean codes is probably a vacuum leak or maybe a MAF sensor is bad or dirty

missfire is dependant on engine if a V10 it may be a coil actually pretty likely on the modulars not uncommon thats for sure
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Po171 po174 restricted performance


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it would not be an O2 sensor, period, they would never cause a high idle, have u had this checked for trouble codes? A sticking idle speed control air bypass can cause this problem as well as a throttle position sensor, but run the codes, Kragen does it for free was well as other parts stores.

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1995 Windstar OBD II showing codes PO340, PO171, and PO174


Hello;
With those codes, the first place I would check is the fuel pressure. Also check the fuel filter and replace it if you haven't already. Then clear codes and recheck. Even if your fuel pressure is with in range it still may not push enough fuel to operate your vehicle.

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IT COULD POSSIBLY BE THE INTAKE GASKETS. FORD HAS A PROBLEM WITH THE GASKETS GOING BAD. IF THE CHECK ENGINE LIGHT IS ON AND GIVING YOU CODES PO171 AND PO174 I WOULD CHECK THE GASKETS BY SPRAYING CARB. CLEANER AROUND THE INTAKE WHILE THE ENGINE IS RUNNING. IF THE IDLE SPEEDS UP THEN THAT IS YOUR PROBLEM.

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