One problem related to gas recirculation valve (egr valve) 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.
Terrible sulphur smell in the cabin. Windows are always up due to 3 of 4 members having asthma. Makes all passengers sick to stomachs and headaches. Want full purchase price back for this vehicle. Cannot drive anylonger. Very upsetting from a Toyota product. Have been to dealer 3 times.