Most sentences that include probation have the following requirement: Do not violate the laws of any governmental unit. Since a city ordinance violation would be included in that list, your citation is a violation of probation. Your probation officer may or may not decide to bring a warrant for that violation. If the PO does take a warrent, it will be up to the judge whether to revoke your probation. If it gets to that point, you will want to have a lawyer represent you at the revocation hearing.