2007 Nissan Pathfinder Code

Vehicles sold in the US since 1995 have onboard diagnostic (OBD) computers. An OBD monitors the vehicle, activating a dashboard light if it detects problems. In Nissans newer than 1995 models, you can read a five-character trouble code by scanning the OBD computer. Other People Are Reading How to Check for Codes on a Nissan Pathfinder 2001 Nissan Code P0440 History
The Clean Air Act of 1990 mandates vehicle monitoring with an OBD. The second-generation onboard diagnostic system is known in the industry as OBD-II. Devices called code scanners can read the codes in OBD-II computers.
Malfunctions An OBD-II computer monitors sensors throughout the vehicle, especially in the engine and emission system. When a sensor reading falls outside acceptable limits, the OBD turns on the "Check Engine" light and stores a trouble code in memory. In post-1995 Nissans, you can read an OBD-II code using a hand-held scanner.
Code P0448 Code P0448 is one of a standard set used by OBD-II computers on all vehicles. The code reports "Evaporative Emission Control System Vent Control Circuit Shorted." This means the solenoid that opens and closes a vent in the control valve in question has a short-circuit and is not functioning correctly.