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?

 

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.

 

also does anyone know if 2007 g35x uses the same sensors as 2009+ g37?

 

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.

 

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.

 

ok! sounds good, thanks guys.