It would be helpful to know what year Explorer you are asking about, as there are different 4WD systems that vary by year. Also, if your vehicle is manual (lever shift), electronic "shift on the fly"(Push Buttons on the dash), or automatically goes into 4WD? Do you mean that the transfer case doesn't engage, or does the vehicle just not drive/handle like it should in 4X? If the transfer case is ingaging, but you're still not in 4X, it could be bad automatic front hubs. They do wear out and break if used a lot. Also check the Power Distribution Box / fuse panel, under the hood, Electric Shift is usually a 20A fuse. Sometimes the electronic solenoid on the transmission sticks, and the transfer case won't engage. This happens to Ex's that do not have 4WD used very often. Hope this helps.
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It depends on what drive E was. It could be a number of reasons. If it was an external drive, it could of come unplugged or the drive has died. If it is a network drive it could have become disconnected or is no longer available. We need more info to be able to properly answer your question.
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The 2001 Ford Explorer has rear wheel drive.
The 2009 Ford Explorer has rear wheel drive.
The 2010 Ford Explorer has rear wheel drive.
The 2012 Ford Explorer has front wheel drive.
The 2004 Ford Explorer has rear wheel drive.
The 2006 Ford Explorer has rear wheel drive.
The 2005 Ford Explorer has rear wheel drive.
The 2011 Ford Explorer has front wheel drive.
The 2013 Ford Explorer has front wheel drive.