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The circuit court generally loses sentencing authority over a case once a sentence is imposed. However, you should contact an attorney regarding your PCR rights under rule 24.035.
See questionOne way is to search casenet. Here is a link. The problem is, not all courts will show a pending warrant, and not all municipal courts participate in casenet. Here is a link:
https://www.courts.mo.gov/casenet/base/welcome.do
See questionA second DWI is an A misdemeanor, see 577.010 RSMo.
A misdemeanors generally carry up to one year in jail and a fine of up to $2,000, however, 557.010 has specific sentencing rules for a second DWI depending on various factors and evidence in your case.
Here is section 577.010
https://revisor.mo.gov/main/OneSection.aspx?section=577.010&bid=34718&hl=
This is definitely a case for which you should hire an attorney.
See question