Iíve exhausted all of my resources to figure out the power problem.
It started with O2 bank 2 errors. I replaced both of them. When it died the second time, Nissan dealer replaced the cam shaft sensors because of the update. They would not let me do it. When I got it back it ran sluggish. I should have carried it back but the power would come and go. Also, I thought that they created the issue. It ran fine before the second set of cam sensors. It did give a lean mixture error. These happen about 12 months ago.
Now it has no power and no errors. I started with the regulator. Replaced it and when I pinched the return line the power came back. Fuel pump and screen have been replaced. Injectors were pulled twice and cleaned. They show no signs of leakage and spray a good mist. Computer has even been replaced. Monitoring the O2 sensor, they read OK when the fuel pressure is at 50+.
The next step was to carry it to a different shop but that shop spent a whole week on it with no fix. They reported that all the timing and pulse width are correct. They even went down the same road I did with fuel.
The car idles OK for 15 seconds; then it goes into an open loop, fuel fault error. With the return pinched to hold 50 lbs. That error does not come back and O2 readings are returned to normal values.
They only error that come up are shifting gear errors. I am looking for any directions.