@juanita1 as others have said, my car is mine, but has it’s very own personality. I do have protective things in it as well as on my keychains. Whether it’s my personal set of keys or my spare set.
As far as entities, I can’t say that mine has had one specifically but it could; maybe a previous owner? When using the divining rods, where they spun like crazy, I would suggest now that there is a something, getting more specific with using them whether the area or questions surrounding the issues it’s having. Much like @georgia suggested… overall you know, but maybe a more specific approach to different areas or questions may help lead you in what is happening.
Adding some kind of mojo bag or other protections may be helpful also
→ CAR protection spell
→ Car or driver protection
→ Travel protection Spell
Some of these topics may have some helpful ideas for your car to help with protection 