One problem related to engine head gasket leaking 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.
I was driving down the highway after getting off the interstate when my vehicle began to overheat. I luckily noticed and pulled over before incurring more damage and warping the engine head. I have heard multiple times that these 4. 0 v6's Toyota made have head gasket problems. After getting it towed back to the mechanic on thanksgiving, I was told I had a blown/leaking headgasket. I have never drove this vehicle over 3k rpms and find it ridiculous it would fail under such good condition.