Consider checking with your P.O. It may be that the conviction which led to having the immobiliser amounts to a violation of probation rules, and that could lead to revocation. If the PO knows about the conviction and has decided not to 'violate' you, you certainly can review the situation with him. The real issue I think is much less the immobiliser than it is the DUI or similar charge which led to it.
You should discuss this with your attorney. If the ignition interlock is a term and condition of your sentence, likely you will not be able to get your probation terminated early. An attorney in your area may be able to help answer your question.
Department of Motor Vehicles and criminal courts are completely separate. Unless the court orders the interlock, and I have not seen that, then it should not matter.
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