Code p1519

I'm trying to fix my car a 1999 m3 bmw, the check engine has been on since I got the car I bought a obd2 tester checked codes fixed all codes cleared The check engine light, the light stood off till I turned the car off and I got code p1519 camshaft position sensor I replaced it twice and now when I clear the light it comes back on after about ten minutes, same code I don't know what to do plz help, thank you