The front transfer case has a pneumatic actuator that can go bad, so the four wheel drive does not engage. This is one type of problem that can occur. I'm sure there are others.
No , a 2002 Toyota 4 - Runner is rear wheel drive or 4 wheel drive
It is 4 wheel drive when the system is engaged. In 2 wheel drive the vehicle is driven by the rear wheels.
4 runner means four wheel drive. If the 4runner is only two wheel drive or the 4 wheel drive is not engaged, the rear wheels power the vehicle.
The 2003 Toyota Tacoma is primarily available in rear-wheel drive (RWD) or four-wheel drive (4WD) configurations, rather than front-wheel drive (FWD). Additionally, it offers both automatic and manual transmission options. If you're looking for a standard shift model, you would likely find it in the RWD or 4WD variants.
Rear wheel drive
The 2004 Toyota Camry has front wheel drive.
The 2012 Toyota 4Runner has rear wheel drive.
The 2013 Toyota Corolla has front wheel drive.
The 2006 Toyota Sequoia has rear wheel drive.
The 2006 Toyota RAV4 has front wheel drive.
The 2007 Toyota Sequoia has rear wheel drive.
The 2005 Toyota Tundra has rear wheel drive.