If it expired less than a year ago, you can still renew it, and keep the same plates. If it has been expired for more than a year, you will have to go through the whole process of re-registering your vehicle, and will need to go to the office with a completed MV-82 and proof of insurance. And the list goes on, if u are not the owner of the vehicle.
If it's expired you need to renew your registration for the lapse of another two year
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