39 problems related to engine exhaust system have 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.
2003 4runner se during accleration, I have exhaust gases entering the passenger compartment. Toyota confirmed that the v8 is mostly affected due to the larger displacement engine. Also, per Toyota, the exhasut gases are entering from a vent located on the left rear of the vehicle. However, Toyota insists that this problem is due to the fuel. I have taken this to arbitration and was denied, even thought Toyota freely admits to the problem. Based on the outcome, I have asked Toyota to state that this is a safe condition and was also denied.
After a few weeks of ownership the consumer noticed that the cabin would fill up with sulfur dioxide fumes. These fumes have caused respiratory issues for the children that ride in the vehicle.
The vehicle was distributing excessive amounts of sulfur dioxide gas from the exhaust pipe . The gas was coming through the air vents and making the occupants sick.
While driving exhaust fumes entered the passenger cabin of the vehicle. Dealer could not duplicate or determine the cause of the problem.