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anyone replace upstream o2 sensor?

Old 06-07-2013, 02:38 PM
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botlfed98
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anyone replace upstream o2 sensor?

I did try doing a search, didn't come up with many results. My car is throwing a P0031 and I have a question which side bank 1 really is? I've read passenger side and also driver's side. What all is involved in replacing the upstream o2 sensor? I'm assuming I have to pull the cat off to get access to it?
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Old 06-07-2013, 03:03 PM
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Black Betty
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Bank 1 is the right side containing cylinders 1-3-5. The upstream sensor is not in the catalytic converter. It is in the exhaust manifold just before the flange connecting them to the cats.

Page EM-33 of the FSM.
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Old 06-07-2013, 03:11 PM
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botlfed98
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also does anyone know if 2007 g35x uses the same sensors as 2009+ g37?
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Old 06-10-2013, 05:41 PM
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Originally Posted by Black Betty View Post
Bank 1 is the right side containing cylinders 1-3-5. The upstream sensor is not in the catalytic converter. It is in the exhaust manifold just before the flange connecting them to the cats.

Page EM-33 of the FSM.

so do I have to pull the cat off to change the sensor?
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Old 06-10-2013, 05:58 PM
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Originally Posted by botlfed98 View Post
so do I have to pull the cat off to change the sensor?
No. As I stated, it's upstream of the cat in the exhaust manifold. Reference the page i posted in the FSM and take a look at it for yourself.
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Old 06-10-2013, 09:34 PM
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Dj1ofDet
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I wrote a DIY for this repair a few months ago. Check it out if you need a few pointers. The repair was really easy, with the right tools.
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Old 06-14-2013, 03:49 PM
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ok! sounds good, thanks guys.
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