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No, it is not a good idea to just walk in and plead guilty without getting an attorney, because this is a misdemeanor case in most situatiions and carries a possible jail sentence of up to 12 months in jail (it is a felony with up to 2.5 years in prison if you were a habitual traffic offender). You are entitled to an attorney if you cannot afford one and you need to exercise your right to have one and do not represent yourself.
The attorney will meet with the prosecutor and will negotiate a deal with them regarding the car and your sentence on the charge and possibly get a deal from the prosecutor to keep the fine minimal. They will not let you pleadguilty before the date without an attorney so you need to get an attorney or get a public defender if you cannot afford an attorney and they will begin negotiaing with the prosecutor.
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