bad switch or possibly stuck switch
the bulb has fused or broken or the electronics need fixing
DOT 3 brake fluid
It should have only a fuse and a switch, no relay. Check ALL of the fuses with a test light.
a malfunction has been detected ( could be a sensor )
The first thing to do is check your fuses. It may be a very simple fix.
If locks have also stopped locking automatically, then you will have to change the brake switch located on the brake pedal. Go to a local auto shop and pick one up. It is easy to replace. Just look how the original is mounted, it is not too complicated.
check fuses & brake lights switch located on brake pedal
No , the 5.0 liter V8 engine in a 1998 Mercury Mountaineer has ( 1 ) timing CHAIN
How do i change the chain out of my 1998 mercury mountaineer transfer case
Yes
Yes , according to the 1998 Mercury Mountaineer Owner Guide : ( the headlight bulb is # 9007 )
how do you change wheel bearing on 98 mercury mountaineer