From ODBDiagnostics help file (BRoadman):
P0448 Evaporative Emission Control System Vent Control Circuit Shorted
Checked the manual for the '96 D21 and the '03 Frontier (only manuals I have) and I don't see that code listed. Please double-check the code and post with the year/model of the vehicle.
Last edited by z50; Nov 8th, 2004 at 10:02 AM.