OBD II (1996 and Newer)

• 1). Open the driver's side door wide enough to get down near the floorboard.
  
  
• 2). Locate the data link connector under the driver's side dash to the left of the steering column.
  
  
• 3). Connect the plug (female) of the pocket scanner to the connector (only connects properly in one position).
  
  
• 4). Turn the ignition key to "On" without starting the engine.
  
  
• 5). Press the erase button on the scanner if it's equipped with one located on the front. If not use the scroll button(s) to toggle through the digital screen display to "clear" or "erase" codes or the "DTCs" option, then follow the directions on the display screen to clear the code. Once the code(s) are clear, provided nothing major is wrong with the Maxima, the service engine soon light will no longer be illuminated.
  
  
• 6). Start the engine of the Maxima and check the instrument panel to verify that the engine light is out. If not, retry the procedure. If it remains on, a "hard" code is present and the vehicle should be serviced as soon as possible.
  
  

OBD (1995 and Older)

• 1). Open the hood of the Maxima.
  
  
• 2). Loosen the black wired negative battery terminal clamp bolt with a metric wrench. Loosen the bolt enough to allow the clamp to be removed from the negative battery post.
  
  
• 3). Turn the headlight switch to the "On" position, then wait 10 minutes.
  
  
• 4). Reconnect the negative battery terminal clamp and tighten the bolt properly so the clamp cannot move.
  
  
• 5). Start the engine to check for the service engine soon light on the instrument cluster. The light should be out because the computer was just reset.