See also:

Replacing exterior bulbs
Check the operation of all the bulbs frequently. ...

Second generation (2003–2006)
The Navigator was updated in 2003, along with the Ford Expedition, on the new Ford U platform. The interior was also substantially revised to bring it up to the level expected by luxury buyers. So ...

AWD systems (if equipped)
With AWD, the vehicle uses all four wheels to power the vehicle. This increases traction, enabling you to drive over terrain and road conditions that a conventional two-wheel drive vehicle cannot. ...