One problem related to front suspension wheel bearing 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.
Frame and undercarriage rust. Rotted bolts affecting ability to have complete alignment performed. Failed wheel bearings causing loud rotational friction sounds while in motion. Rusted exhaust system causing failure and required replacement.