1997 Mercury Marquis o2 sensor

1997 MERCURY MARQUIS
84,000 MILES • 4.6L • V8 • RWD • AUTOMATIC
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GBKINS1
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what's the best way to reach the upper sensor wire connector
Sep 6, 2014 at 6:08 PM
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WRENCHTECH
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What "upper sensor" are you referring to? There is nothing by that name.
Sep 7, 2014 at 5:34 AM
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WRENCHTECH
  • ✓ASE Certified Mechanic
  • 20,761 POSTS
  • ASE Certified Mechanic
OK, I see now you are referring to the upstream 0/2 sensor. There are still 2 of those but they are pretty much the same. I know the plugs are very hard to reach on those. I usually use a long, thin screwdriver to release the locking tab and then pull on the wire. I use the same screwdriver to get it plugged back in later.
Sep 7, 2014 at 5:37 AM
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