One problem related to check engine light on has been reported for the 2001 Toyota 4Runner. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2001 Toyota 4Runner based on all problems reported for the 2001 4Runner.
Hvac issue causes check engine light to stay on for 2001 Toyota 4 runner. Took issue to be repaired but still occurs. Gas leaks due to the issue.