Just had my "Check Engine" light come on for me at 29.5K miles. Turned out to be a bad left O2 sensor. What scared me was that when talking to the service technician, he said that he's seeing a rash of O2 sensor failures on 2000 Tundras -- on average of 1 a week here on Oahu. And it's always the left O2 sensor that fails!
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