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There are many possibilities why that light came on, too many to list here. Have your local auto parts store plug a code reader into your car to help narrow down the possibilities. They will perform this service at no cost.

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9y ago
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9y ago

Because there's been a fault detected. Go to any auto parts store and ask them if they'll do an OBD scan - it's a free service provided by all the major retailers.

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Q: Why the engine light is on Toyota 4 runner 2003?
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