A service engine soon light on a Nissan Pathfinder can mean many things. There could be a bad spark plug or even an engine malfunction. A mechanic can run a diagnostic check to see what the problem is.
If the interior and parking lights are not working on a 1999 Nissan Pathfinder, the first fuses to check would be the interior light fuse. Also check to make sure the light switch is in the right position to allow the interior lights to come on.
If the check engine light stays on for the Nissan Pulsar n16, you would need to check the engine in order to clear codes. You can take the car for service and the problem will be diagnosed and restored to normalcy.