Amends the Property Tax Code. Provides that the owner of the certificate of purchase shall promptly notify the county collector in writing that a petition for a sale in error has been filed. Provides that the court may deny the petition for a sale in error if the notice is not filed. Amends the Property Tax Code and the Mobile Home Local Services Tax Enforcement Act. Provides that, when the owner of the certificate of purchase is the county as trustee for taxing districts, then, upon request of or consent by the county as trustee, the county collector may declare an administrative sale in error at any time and for any reason. Provides that the declaration shall state the reason why the sale should not have occurred. Effective immediately.