Mode 4: Clearing Codes

WARNING: This page is about a different car, the 2002 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.

This mode can clear all emission related diagnostic information for DTCs. These include:

Clear number of DTCs (MODE 1).
Clear DTCs (MODE 3).
Clear DTC for freeze-frame data (MODE 1).
Clear freeze-frame data (MODE 2).
Reset status of system monitoring test (MODE 1).
Clear on-board monitoring results (MODE 6 and 7).