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Old 05-23-2013, 08:57 AM   #1 (permalink)
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Default Changing O2 sensors

Have to get some work done on my car, & one of the things they mentioned was they needed to replace the O2 sensors. I've got to take it in anyways, since the timing cover needs to be replaced (it's leaking) and I definitely do not feel comfortable doing that repair myself.

On review, it seems somewhat easy, but I'm not sure. How easy is replacing the sensors? I'm a relative novice when it comes to repairs. I can do basic stuff myself - oil change, spark plugs, brakes, etc - but some more complex stuff makes me nervous. Also, how many sensors are there? I've seen 2 & 4 in different places.

My Taurus is a 2006 Taurus SEL Vulcan 3.0L V6.
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Old 05-23-2013, 11:30 AM   #2 (permalink)
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2 upstream (pre-cat) o2s with green elec. conn. 2 downstream (post-cat) o2s with blue elec. conn. Usually no need to replace the 2 downstream. Standing at the front of the car, hood open, look behind and to the right of the radiator for the green plug. This is your bank#2 sensor#1 (upstream). Now, look between the eng. and firewall for the other green plug. That is your bank#1 sensor#1 (upstream). You may be able to r&r the 1 behind the radiator with a 7/8" (22mm) combo wrench from above or below (air dam removed). Access to the firewall o2 is a bit more challenging. I suggest you go to Harbor Freight Tools and check out their selection of various o2 sockets, crowsfeet and offset tools. A parts store may offer an o2 tool set in their loaner program.

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Old 05-28-2013, 08:28 AM   #3 (permalink)
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Thanks Sheila. I think I found the two upstream ones, both near the spark plugs, correct? Also, the shop service manual I have says only 2 HO2S required. Presumably they're just referring to the upstream ones?

Appreciate your help in all this.
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Old 05-28-2013, 10:40 AM   #4 (permalink)
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Harbor Freight has some generic O2 tools. What i really found helpful
(especially on the bank 2 sensors) is a offset tool/wrench combo.
I believe i got mine at advance auto for $25/30 dollars or so.
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Old 05-28-2013, 06:15 PM   #5 (permalink)
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I'm assuming the two pictured here are the upstream ones that I should be concerned about, correct?
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Old 05-28-2013, 09:36 PM   #6 (permalink)
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They're in the 2 locations I described above. Remember, the 2 upstream will have green elec. conns., the 2 downstream will be blue.
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Old 06-28-2013, 12:55 PM   #7 (permalink)
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RockAuto has 2 upstreams listed - 11" wires & 15" wires. Does it matter which I get? Is the longer wire preferred, or is there a concern that the longer wire could rub against other engine parts & become frayed/damaged?
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Old 06-28-2013, 03:02 PM   #8 (permalink)
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They are different lengths for each location. What I do is to use the Motorcraft site to find the exact part number (per VIN number) and after that cross-reference it on RockAuto or similar sites.
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Old 06-29-2013, 08:45 AM   #9 (permalink)
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Why was it so hard just to measure the length of the one that was on there?
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Old 06-29-2013, 10:23 AM   #10 (permalink)
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Because usually you buy the new part before you take out the old one.
Otherwise you need to take the bus or taxi or walk to the parts store.
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