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Old 12-01-2018, 06:28 AM   #1
DonM
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How many O2 sensors on an LFX

I'm pretty sure I have 4 (2 upstream and 2 downstream) O2 sensors and I'm getting info that chemically cleaning the upper intake may have triggered the P0174 CEL code.

The question now is: How do I figure out which one is throwing the code and how hard are they to replace?
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Old 12-01-2018, 08:24 AM   #2
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They're not hard to do. P0174 is bank 2 so if you swap one set (upstream or downstream being a set, switching left and right side to the other side) and the code moves it's that one. Pretty sure bank 2 is the right side.
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Old 12-01-2018, 08:40 AM   #3
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According to the Haynes manual bank 2 is the left/driver's side.
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Old 12-01-2018, 08:56 AM   #4
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That would make sense. Don't mind me. That's what the forum is for. Lol
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