One problem related to check engine light on has been reported for the 2002 Toyota Tundra. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2002 Toyota Tundra based on all problems reported for the 2002 Tundra.
Co2 sensor. Randomly breaks. There was a recall on co2 sensors several years ago and both mine were replaced at separate times (when they both went out). Now a third co2 sensor (right rear) is bad and according to the dealer, not under a recall. Failure results in "check engine light. " cost $282.