2003 Mercury Mountaineer Trouble code P2195 02 senser sign

FXRSMIKE

MEMBER
2003 MERCURY MOUNTAINEER
V8
AWD
AUTOMATIC
86,678 MILES

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 !

5 Replies

RASMATAZ

MECHANIC
75,992 POSTS

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.

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Wednesday, February 18th, 2009 AT 12:25 PM

FXRSMIKE

MEMBER
3 POSTS

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?

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Wednesday, February 18th, 2009 AT 1:09 PM

RASMATAZ

MECHANIC
75,992 POSTS

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.

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Wednesday, February 18th, 2009 AT 1:17 PM

FXRSMIKE

MEMBER
3 POSTS

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 !

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Wednesday, February 18th, 2009 AT 1:46 PM

RASMATAZ