there can be many different problems but it could be a bad relay switch to check it get on the floor on the passenger side and check to see if the air suspension relay switch is on, try that for now, usually if someone uses a jack to raise the car and the tires have to come off the ground,they switch it off, so the height sensors don't mess up. but it this causes the check suspension light to come on.
Not using premium fuel caused that in my 2004 Navigator.
It could be one of your vaccum lines that collapsed
lincoln navigator
Turn signal flasher module?
hellow just wonderin if you guys know where would be the heater core on my 2003 Lincoln navigator
i"m not sure if a Lincoln navigator would have a sway bar, But my sway bar broke in my Chevy celebrity once and the whole car would rock side to side after turns and such. it's a bar by the rear axle and mine literally broke in two.
brake switch located on the top of the brake pedal
That would depend on the year of your Navigator and Expedition. See the related link.
I would say NO ( I was looking at the 2001 Lincoln Navigator Owner Guide and it does not show anything about it having a cabin air filter )
That would depend on what needs repair. If you expect and answer be more specific.
on my 2000 town car it was the idle air control valve sounds like you have the same problem
It could be spark plugs or coil packs. Auto Zone will check your computer codes for FREE. This way you won't be guessing.