AWD 1998 mercury Mountaineer
2 Answers
The 4x4 and ABS light will be lit up on the dash and you would have traction problems. A good mechanic can inspect the system. To fix could be as easy as a sensor to a transfer case.
One way to test an AWD system is to find a patch of gravel road. Stop and then floor it to see if you get traction in the front tires.