Conditions For Clearing MIL/DTC

WARNING: This page is about a different car, the 2003 Pontiac Aztek and 2003 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

PCM will turn OFF the Malfunction Indicator Light (MIL) during the third consecutive trip in which the diagnostic has run and passed.
A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
Clear the MIL and the DTC with a scan tool.