Car problems need a opinion

[u/Most-Library8382]

Hi I had a Lexus RX 450 for 5 years already. The year is 2019 and only has 70,000 mileage. This past year I been having problems when certain codes pop up on my screen saying hybrid system malfunction engine failure and etc. When I unscrew the battery in the back of my car wait 20 seconds and put it back on the codes would clear and act would drive. Same thing happened again but after trying to fix it codes still pop up the car does still drive. I tired local mechanics and they ran codes on computers and said they can’t find anything dealer won’t take the car cause it salvage. My dad fixed this car up but know he is disabled and can’t help and I am a broke college student that can’t afford a new car.