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O2 Sensor Location

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Old 10-02-2007, 07:08 AM
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O2 Sensor Location

I want to test sensor 1 bank 1 but can't find the location of the harness

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Old 10-02-2007, 10:48 AM
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is sensor 1 bank 1 the sensor farther back? anyone?
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Old 10-02-2007, 10:56 AM
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looks like to me it's the one far back of the engine
http://forums.maxima.org/showthread....t=oxygen+senor
even know this fifth gen but it should help little
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Old 10-02-2007, 01:07 PM
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Confirmed, yes it is, and the connector for it is to the left and forward of the coil pack for the #1 cylinder. When looking at the engine it is the far back left cylinder
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Old 10-02-2007, 02:08 PM
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ok so i tested out the sensor and it tests out the same as the other sensor which is two months old, can the check engine light be coming on for another reason that isn't due to that sensor being bad?
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Old 10-02-2007, 02:34 PM
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it could be the O2 in behind the cat
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Old 10-02-2007, 02:40 PM
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so bad O2 behind the cat could cause the bank 1 sensor 1 code to trip? wouldn't that cause the O2 sensor on the cat to trip instead?
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Old 10-03-2007, 11:47 AM
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How are you testing it?

No, that's a cat efficiency code that could be caused by a upstream OR downstream o2 sensor. Chances are very likely that if you have a bank 1 sensor 1 code that o2 is crap.
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Old 10-04-2007, 06:16 AM
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yea i was testing it wrong, i followed this instruction sheet but after some research figured out that you can't test the O2 sensor without it being connected, i'm going to test it the right way now
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Old 11-25-2007, 12:45 PM
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Originally Posted by KRRZ350
How are you testing it?

No, that's a cat efficiency code that could be caused by a upstream OR downstream o2 sensor. Chances are very likely that if you have a bank 1 sensor 1 code that o2 is crap.
how about if both bank 1 and bank 2 both sensor 1's are bad...?thats the code i've got.

sorry for bumping a month old thread btw.
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