One problem related to steering rack and pinion has been reported for the 2003 Toyota 4Runner. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2003 Toyota 4Runner based on all problems reported for the 2003 4Runner.
Exposed parts of Toyota steering components all rusted tight. Very dangerous when it finally locks. I am sure there was a recall notice on this when I first got the vehicle. They seem to have wanted to hide this issue. Replaced the rack and pinion the steering rack and steering knuckle. Hose ends corroded so bad had to replace it also.