Turn the ignition on and wait for the service engine soon light to blink and shut off this will reset the light on your dash. Wait three seconds depress and release the gas pedal five times in five seconds then let the pedal up count seven seconds and then depress the gas pedal and hold it down for 10 seconds as soon as the service engine soon light starts flashing trouble codes let the pedal up. It depends on how old it is if the nissan is around 06 or newer there are 2 buttons that are really close to each other usually one is right above the other one of the buttons the one on top usually has an icon that looks like 3 papers stack. Just a tutorialif you havent already please subscribe to this channel and if any of the content has helped you please give me a thumbs up also if you w