Why is the 4-Wheel light blinking on your 2000 Mitsubishi Montero Sport Limited?

a sensor is bad. if it blinks all the time, it is deff. a sensor. watch for this next time your driving. if it anti-lock light turns on while braking, feels like something is grinding or not running right, take it in to a Mitsubishi dealer and have them read it. i had the same issue, it was a sensor smaller than the palm of my hand, costs around $150 at the dealer, no after market available. If you do not fix this, and this is the problem, your transfer case will continue to try and invert power from the front end to the rear because it knows something is not right, while your front end believes it is in 4wd so it will continue to try and keep power in the front. in the end your 4wd will go, and your transmission will be shot.