Reset check engine light 2005 Nissan exterra?

The only way to reset the Check Engine light on the Xterra or any other modern car is through the use of an OBDII diagnostic reader. You can take the car to most any mechanic and have them do it - they usually charge around $25 or so to do it. Or you can purchase an OBDII reader and do it yourself. The most inexpensive readers cost around $80. More expensive readers have more features that most DIY'ers don't need. The OBD reader plugs into a socket, usually below the steering column - it is always within a foot or so. The reader will display error code(s) that caused the check engine light to come on, and has a feature to reset the error code. Remember that if you haven't fixed the problem that caused the Check Engine light to come on in the first place, it will come back on again. Some causes are simple - in my Toyota Corolla, the gas cap was loose and caused the CE light to come on. But it can be caused by anything from a transmission problem to a catalytic converter problem. The OBD reader displays a code that can be looked up online or via software provided with the reader which will tell you what caused the problem.