Question about 2002 Toyota Sequoia

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What should i look for when troubleshooting the check engine light?

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HI. when the engine light comes on, your really cone look for anything. this light is connected the a on boar engine control module(ecm). this is a CPU that regulates a small current to many sensors that are connected to the engines vital regions. if any of the conjoining sensors detect an abnormality within the operation of the engines ldle or electrical situation as well, it will trigger the check engine light.

Once this light is triggered, it will generate a code that will explain what the actual problem is and how to repair it as well. these codes are extracted by a special diagnostic cpu that your local mechanic will have or, you can take your vehicle to Auto Zone and , they will run it for free. there is a legend that will has a available codes for your vehicle and the tech will match up the appropriate code for the read out.

In most situations, the issue here will be a failed sensor of some sort. maybe a malfunctioning O2 sensor or a bad egr valve etc...

PLease rate and have a great day:)

Posted on May 11, 2009


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