Hey Guys,
I'm new here but I have an issue that's been driving me crazy.
I have a 09 G37x sedan
First, a few months back I had the P2A00 light come on.
I replaced the sensor twice, when the light kept coming on i figured out that my passenger side cat had a crack.
So I replaced both cats. 2 months later my light comes on again with codes P1148 & P0031.
- I checked the fuse and the fuse is good.
- I checked for leaks and can't find anything

Every time I reset the code it comes right back on as soon as I turn on the car.

Anyone else ever have this issue?
What was causing it?

Any ideas?

Thanks everyone!

 

 

When I was getting a P2A00 it ended up being an exhaust leak between the cat and manifold. I brought it to an exhaust shop to remove the cats, clean up the flanges, replace the gaskets, and throw in some RTV sealant. No more CEL a few hundred miles later *knock on wood*. Not sure about the other codes. I'd suggest finding a shop that's willing to check for leaks or you can do it yourself. Mine used the stethoscope method.

 

I was able to solve P2A00 when I replaced the cats
Now these 2 codes have come up and I'm stuck

From searching I do see that this is a common problem with G37s
But I don't see any posts with people stating what fixed it
If it was an electrical problem what exactly was the cause?

 

Thank you!
I'm leaning towards it's an electrical issue because when I reset the codes the light comes right back on.
But I'm just not sure of where to start