(35 ILCS 516/405)
    Sec. 405. Tax certificate of title incontestable unless order appealed or relief petitioned. Tax certificates of title issued under Section 395 are incontestable except by appeal from the order of the court directing the county clerk to issue the tax certificate of title. However, relief from such order may be had under Section 2-1401 of the Code of Civil Procedure in the same manner and to the same extent as may be had under that Section with respect to final orders and judgments in other proceedings. The grounds for relief under Section 2-1401 shall be limited to:
        (1) proof that the taxes were paid prior to sale;
        (2) proof that the mobile home was exempt from
    
taxation;
        (3) proof by clear and convincing evidence that the
    
tax certificate of title had been procured by fraud or deception by the tax purchaser or his or her assignee; or
        (4) proof by a person or party holding a recorded
    
ownership or other recorded interest in the mobile home that he or she was not named as a party in the publication notice as set forth in Section 380, and that the tax purchaser or his or her assignee did not make a diligent inquiry and effort to serve that person or party with the notices required by Sections 370 through 390.
    The court hearing a petition filed under this Section or Section 2-1401 of the Code of Civil Procedure may concurrently hear a petition filed under Section 235 and may grant relief under either Section.
(Source: P.A. 92-807, eff. 1-1-03.)