1996 Mercury Villager code P0135

1996 MERCURY VILLAGER
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IGALFO
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Computer problem
1996 Mercury Villager 6 cyl Front Wheel Drive Automatic
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the check engine light came on went to inspection told me code P0135 came up on their computer before i went to inspection we replaced the oxygen sensor on the exhust manifold all the way in the front of the car the light was off until i turned off the car and once i restared the car the light came bagk on should i replace all the o2 sensors i was told there are 3 more and i also wanted to know if you had a illustration of where they are located
May 15, 2008 at 8:34 PM
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BMRFIXIT
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p0135 is bank one sensor one
bank one it toward the fire wall O2 in the manifold
the one u had replaced was bank two sensor one
you have before and after catalytic converter
May 15, 2008 at 8:52 PM