the engine is not shutting off in my son's 2000 frontier even after the key switch is off
Possibly faulty ignition switch
Thats what im thinking, since they are all electronic.
I had the same problem installed new ignition switch, that didn't fix the problem.
Looking for a Used Frontier in your area?
CarGurus has 20,763 nationwide Frontier listings starting at $2,500.
Search Nissan Frontier Questions
Nissan Frontier Experts