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:
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.
35 ILCS 516/405