If that happened in a court in my area, a judge would likely issue a warrant for you, charge you with a probation violation, revoke probation (if it was not already revoked) and look to take you into immediate custody and add on jail time to your sentence. If you already missed your surrender date, you should speak to an attorney in your area to help mitigate potential consequences.
If you fail to surrender yourself as agreed a warrant will issue and sooner or later when you encounter a police officer who runs your name you will be held without bail and transported to the court. That court will probably increase your sentence by charging you with escape or some other crime for failing to appear. I strongly suggest you get this over with while it is only 45 days. Since you have already admitted guilt, you could be sentenced to up to 2.5 years. I would take the 45 days now instead of taking the chance on what it may be increased to later.
Maximum penalty for a OWI is 1 year in jail. Since you were ordered to do 45 and you didn't , I would suspect that you could look at double that amount of time.
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