The NSS is to prevent starting the engine in any gear other than Park and Neutral position and its called digital transmission range sensor located on left side of transmission. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.