However, there are some exceptions to this rule. If you are a foreign diplomat or military member stationed in California, you may be able to display a foreign license plate on your vehicle. You will need to contact the DMV to obtain a special permit.
Additionally, if you are a classic car enthusiast, you may be able to display a European license plate on your classic car if it is at least 25 years old. You will need to contact the DMV to obtain a special permit and provide proof that the car is a classic car.
In all other cases, it is not legal to put a European license plate on a California car.