This answer is provided for education value regarding general legal concepts and is not to be considered legal advice.
All of the assets that are in the name of the deceased at the time of their death would be considered their probate estate. Probate is used as the state's official way to change title. This would include cars, real estate, personal property and cash assets.
Probate would allow the estate to transfer the title out of the deceased person's name into the name of their beneficiary.
Yes, a car owned by a decedent would be considered part of the decedent's estate.
Any individual seeking legal advice for their own situation should retain their own legal counsel as this response provides information that is general in nature and not specific to any person's unique situation. Circular 230 Disclaimer - Advice given in this response cannot be used to eliminate penalties with the IRS or any other governmental agency.