Question about Cars & Trucks
Posted by Anonymous on
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
SOURCE: 2001 Ford F152 6cylinder has
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.
Posted on Jan 15, 2011
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
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
Tips for a great answer:
Feb 26, 2015 | 2001 Ford Windstar
Feb 18, 2013 | 2003 Ford Expedition
Feb 18, 2013 | 2003 Ford Expedition
Apr 12, 2011 | 2001 Ford Windstar
Nov 11, 2010 | 1997 Ford Expedition
Oct 06, 2010 | 1998 Ford Expedition
Jul 19, 2009 | 2001 Ford Explorer Sport
Apr 12, 2009 | 1996 Ford Ranger SuperCab
Jan 15, 2009 | 1995 Ford Windstar
Aug 23, 2017 | Cars & Trucks
Aug 23, 2017 | Nissan Cars & Trucks
97 people viewed this question
Usually answered in minutes!