Vacum Leak
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Senior Member
Joined: Apr 2006
Posts: 189
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From: Manassas, VA
Vacum Leak
Auto Zone pulled my engine codes and it said O2 Sensors, but I was told on this site that is was more than likely a Vacum Leak I can't find on anywhere should I take it to Ford and have them look or change the O2 Sensors? Below is my previous posting for reference.
I have a 97 F-150 4x4 with the big 5.4L motor in it. The other day the Check engine light came on so I took it to Advanced Auto Parts and they read the codes and told me it was the O2 Sensor. I will post what the code if someone can confirm that it is the O2 Sensor that would really help me out. I don't think it is that particular sensor becase it has not affected the perormance of the truck at all. No spitting sputtering or running rough. So here is the code........
Trouble Code OBII (Alpha) P Code
Troubleshooting PO171
The PCM has deteremained that during testingthe fuel system for bank 1 was too lean. (Bank 1 identifies the location of cylinder #1 while bank 2 indentifies the cylinder on the opposite bank)
Please help I would like to fix this as soon as possible.te that it was more than likely a Vacum Leak but I can't find one anywhere. Should I now change the O2 Senosor or take it to Ford to have them look for a vacum leak?
I have a 97 F-150 4x4 with the big 5.4L motor in it. The other day the Check engine light came on so I took it to Advanced Auto Parts and they read the codes and told me it was the O2 Sensor. I will post what the code if someone can confirm that it is the O2 Sensor that would really help me out. I don't think it is that particular sensor becase it has not affected the perormance of the truck at all. No spitting sputtering or running rough. So here is the code........
Trouble Code OBII (Alpha) P Code
Troubleshooting PO171
The PCM has deteremained that during testingthe fuel system for bank 1 was too lean. (Bank 1 identifies the location of cylinder #1 while bank 2 indentifies the cylinder on the opposite bank)
Please help I would like to fix this as soon as possible.te that it was more than likely a Vacum Leak but I can't find one anywhere. Should I now change the O2 Senosor or take it to Ford to have them look for a vacum leak?
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Joined: Mar 2006
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From: MI
Technical Article Contributor
Joined: Oct 2005
Posts: 25,641
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From: MI
I'll make it easy ,just clean your MAF - Check for vac leaks - PCV- easy stuff
BTW, that's right , your O2's are fine - they helped your PCM in it's determination of those infamous miscellaneous codes lol - tells me that they are working thats all.
BTW, that's right , your O2's are fine - they helped your PCM in it's determination of those infamous miscellaneous codes lol - tells me that they are working thats all.