cairo7

I recently bought a 04' 350z, I was told by the owner that it needed a new coil and spark plugs which I replaced. Later on in the week I drove to the barbershop and when I went to start it I notice it had problems cranking. After I drove it home, I turned it on and off and it seemed fine. I went to start it a few a minutes later and it didn't want to crank it all. After push starting it I took it to Autozone to get the codes scanned and it gave me P1148 and P1031. At first I thought it would just be the starter. Has anyone here had problems with these sensors not allowing the car to crank? Any information would be appreciated.