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Diagnostic codes for 2001 ford expedition b1155, po171,po174

Posted by Anonymous on

5 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 2001 olds aurora scan codes

P0171-This Relates to Bank 1 - System is too Lean

Posted on Jul 02, 2010

ginko
  • 19396 Answers

SOURCE: 2001 Ford F152 6cylinder has

Hi.

Both codes mean that the fuel/air mixture injected in the cylinders is lean.

P0171 is: System too lean detected from O2 sensor monitoring Bank 1.

P0174 is:System too lean detected from O2 sensor monitoring cylinders in Bank 2.

When you get the two codes, it means that the mixture is effectively lean. Both codes menas that problem is NOT a defective O2 sensor (they do not fail at same time), and thatproblem is NOT concerning a single cylinder in one of the banks.

The most common problem returning the two codes at once is a dirty or defective MAF sensor. The MAF sensor located in the air intake detects the amount of air getting into the intake, and determines how much air from intake is being mixed with fuel and injected.

Other common cause is a vacuum leak. If there is a hole in one of the vacuum lines, then the vacuum will aspire extra air from the hole into the intake. This will result in a lean mixture.
Vacuum lines can be tested using a gauge like this in the lines while heating lines with an hand torch or spraying them with carb cleaner (safer for newbies). If there is a leak in proximity of the heated or sprayed area, you will notice a little pressure variation while you temporarily close the gap using one of the two methods.

If problem happens only when engine is cold, check also the air intake temperature sensor. This is not really a common failure, check the rest first.

There are more faults that may result in a lean code, like for example defective IAC (valve stuck open), EGR valve not opening, electronic injection problem etc. Such faults are rather uncommon, and/or usually accompained by more codes or extra symptoms.

With the two lean codes the engine should rev a little higher than normal, and you are consuming more fuel. Problem may get worsening in time.

Regards.

Ginko.

Posted on Jan 15, 2011

Ken17402
  • 615 Answers

SOURCE: 2003 Ford Expedition check engine light on .Codes PO171 & PO174

This is a tough one could be mass air flow sensor ,oxyegen sensors,a fuel filter. a vacum leak, a pcv valve if i missed anything just google po 171 &174 look for fix ya this issue has been addressed many times first check the vacum lines includeing the line on the pcv valve for cracks or splits in the lines .I would do the fuel filter if it hasnt been changed in the last couple of years , if still a problem the MAF sensor if your happy with my advise please leave me with great feedback

Posted on Feb 19, 2013

SOURCE: 2003 Ford Expedition check engine codes PO171 & PO174

You should be replacing all upstream oxygen sensors,
the ones at the inlet or pipe before the converter,on all
your vehicles at 100,000 miles

Go to Rock Auto.Com & buy two & install yourself

NTK 22060 $26.79 ea

Posted on Feb 20, 2013

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1 Answer

I have a ford windstar 2001 LX 3.8 i have the codes po401 po171 and po174


171 is a HEGO sensor unable to switch/ 174 is for HEGO sensor also.. 401 is insufficient EGR flow!! egr valve may be clogged or need replaced!!

Feb 26, 2015 | 2001 Ford Windstar

1 Answer

2003 engine light codes po171 and po174


4.0 SOHC engine? You have leaking intake plenum gaskets. About $25 to $50 for parts and a couple hours of you time and you should have it licked

Apr 10, 2013 | 2003 Ford Expedition

1 Answer

2003 Ford Expedition check engine light on .Codes PO171 & PO174


This is a tough one could be mass air flow sensor ,oxyegen sensors,a fuel filter. a vacum leak, a pcv valve if i missed anything just google po 171 &174 look for fix ya this issue has been addressed many times first check the vacum lines includeing the line on the pcv valve for cracks or splits in the lines .I would do the fuel filter if it hasnt been changed in the last couple of years , if still a problem the MAF sensor if your happy with my advise please leave me with great feedback

Feb 18, 2013 | 2003 Ford Expedition

1 Answer

2003 Ford Expedition check engine codes PO171 & PO174


You should be replacing all upstream oxygen sensors,
the ones at the inlet or pipe before the converter,on all
your vehicles at 100,000 miles

Go to Rock Auto.Com & buy two & install yourself

NTK 22060 $26.79 ea

Feb 18, 2013 | 2003 Ford Expedition

1 Answer

Check engine light is on codes are po171 system too lean (bank 1) po174 system too lean (bank 2) so what can i do


Look for vacuum leaks,that are causing the O2 Sensors to go lean, and set codes on both banks

Nov 11, 2010 | 1997 Ford Expedition

1 Answer

I have a 2000 model expedition and the codes po174 and po171 are popping up, along with po301 and po306 showing misfire. How can I fix that?


P0174/0171 are bank 1-2 running lean (insufficient fuel) which is related to the misfire codes. When there is a misfire detected, the computer shuts fuel to those cylinders triggering "too lean" codes. These vehicles are known for ignition coil failures. I'd recommend you replace all ignition coils (qty of 8) as they do have a short life span. Replace with another brand (not motorcraft/Ford), such as MSD/Accell/BOSH etc. hopefully this helpd!!

Oct 06, 2010 | 1998 Ford Expedition

2 Answers

Code po171 and po174. fuel bank 1 & 2 lean. what can i do about it


From Twitter by @carpartslocator.

@car_problems oxegen sensor oar the airflowmeter.but i do not know what kind of car you have i am gessing ford....??

Good luck.

Jul 19, 2009 | 2001 Ford Explorer Sport

1 Answer

1996 ranger 4.0 codes po171 and po174 come up on the screen


Check for vacuum leaks, especially the intake manifold gaskets. If those are o.k., clean the Mass air flow sensor.

Apr 12, 2009 | 1996 Ford Ranger SuperCab

1 Answer

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.

Jan 15, 2009 | 1995 Ford Windstar

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