Bought this 2009 g37 sport coupe a year and a half ago, been trying to fix these codes since. The car is was clearly bottomed out. I didn’t notice until after I bought it, the whole bottom is dented & scratched up. 7 codes continuously pop up. When I bought it the guy said it just needed up front o2 sensors. I changed them. That solved nothing. Out of ideas.

codes popping up: p1148, p1168, p0113, p0031, p0051, p0037, p0057

 

Start checking your wiring harnesses and ground connections. For all of those sensors to go at the same time, there has to be a wiring issue.

Download Section EC (Engine Control System) for your car from here (the site is slow but it does work) and with your multimeter, start checking for ground and voltage at each sensor.