2003 Mercury Mountaineer Trouble code P2195 02 senser sign

2003 MERCURY MOUNTAINEER
86,678 MILES • V8 • AWD • AUTOMATIC
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FXRSMIKE
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Seven days ago I replaced my alternator.The other day I was driving home and the battery light came on and it was nite time so the lights started going dim so I guess that alternator went bad.It was a rebuild.I replaced it charged the battery and started the truck it ran about 2 seconds and shut off.It did this over and over.I hooked up my snap on fuel pressure gage and I have 69 psi.My book says it should be between 60 & 69 psi,so I don't think it's that.Hooked up my scanner and I have a code P2195 02 sensor signal stuck.If this is the problem would it let the truck start and shut it off this quick.There are 4 sensors on the exhaust how can I check to see which one this could be.The truck ran great before all this happened.Thanks for your HELP !
Feb 18, 2009 at 12:01 PM
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RASMATAZ
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The O2 sensors won't do that-You probably disconnected the battery and the computer loses its memory, now it must go thru a relearning process.

Try disconnecting the negative cable for 5 minutes and see what happens or 40 restarts.
Feb 18, 2009 at 12:25 PM
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FXRSMIKE
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You were right code is gone now.Truck is still doing same thing.Starts and shuts off in one or two seconds.But this time I tried to use the accelerator pedal and it stayed running a little rough but ran.When I removed my foot from the pedal it shut off ?
Feb 18, 2009 at 1:09 PM
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RASMATAZ
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Sounds like the idle air control valve try cleaning it and see what happens. Same thing it must go thru its relearning process or take in and have the dealer flash the computer.
Feb 18, 2009 at 1:17 PM
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FXRSMIKE
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Found the problem.Apparently while I was changing the alternator for the second time , I split a vacuum hose that comes off the cold air intake tube.It's the one that branches off about halfway up this air intake tube and goes to the front top of the intake. And there is a black plastic box halfway up that tube.Anyways where it attaches to the front of the intake it was split about 3 inches.Enough I guess to suck air and cause it not to run.I guess that was something I shoul have caught sooner.Well thanks for all the help !
Feb 18, 2009 at 1:46 PM
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RASMATAZ
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That will cause the IACV to react false air ( vacuum ) leakage
Feb 18, 2009 at 2:07 PM