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Old 04-04-2009, 08:54 PM   #1
GABRIEL
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O2 Sensor?

I just replaced the one on the header, passenger side.
Where the heck is the other one? It is a 1999 F150 4.2 liter, 6 cylinder.
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Old 04-04-2009, 09:13 PM   #2
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right behind the catalytic converter.
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Old 04-04-2009, 09:19 PM   #3
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on the passenger side?I thought my truck had two converters? I am going to go out and see if I can get it done. Thanks.
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Old 04-04-2009, 09:58 PM   #4
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if you have a v6 then it's likely that there might be 4 O2 sensor. There is always one in front of the catalytic converter and one after it.
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Old 04-05-2009, 12:06 AM   #5
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afaik the fords have 4 sensors on V engines, one pre cat on each cylinder bank, then one further back on the exhaust usually in or right behind a catalyst.
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Old 04-05-2009, 09:34 AM   #6
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4 total, two on either side, the one closest to the engine are called "upstream" the ones after the cats are "downstream"

where you getting any codes?
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Old 04-05-2009, 10:19 AM   #7
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Yes, P0136, and P0141.
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Old 04-05-2009, 10:31 AM   #8
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that should be the second/downstream o2 sensor. it may be easier to find it from under the vehicle, if i was looking i would be looking on the sides of the catalytic converters or just behind either of them and just look for any wiring that looks like it may run near the exhaust.

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