My son bought a 2011 g37 sedan now it is throwing p0340 p0345 and p0335 codes. We have replaced all 3 sensors but those codes keep coming back. The car also won't go past 3200 rpm. Any help would greatly be appreciated

 

You might want to try searchgn the forums for others who had those codes. I ran a quick look and found numerous posts on those codes.
Hope this helps!