Drivetrain malfunction/fuel supply warning and code P1339?

I have a 528i and keep getting a drivetrain warning and recently it’s followed by a fuel supply warning. I have a cheap code reader that gave me a P1339 which was for the camshaft sensor I replaced both and still have both warnings coming up. The car starts but drives in “limp mode” and has no power and shortly (usually within 10 minutes) of driving it feels like it is running out of gas that’s when the fuel supply warning comes up - I have gas in the car- it will just shut off and die. I have to wait a bit then it will start up again - help! Please! I don’t know much about cars so I’m afraid being a female and taking it in for work without knowing what the problem is they will just throw parts and repairs at me until it’s fixed, and I can’t afford that plus I desperately need my vehicle for work and transportation for my children. I’m afraid to go have it scanned with a better scanner at day auto zone because I already had to have it towed once this week as I broke down in a very unsafe spot. I really need some help here please and thank you so much!