What does this symbol mean and what kind of service might need to be done if this pops up on your cars’dashboard?

What does this symbol mean and what kind of service might need to be done if this pops up on your cars’dashboard?
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So y’all are saying it could be as simple as needing to have spark plugs replaced? Could it have anything to do with the Cadillac converter?
What does this symbol mean and what kind of service might need to be done if this pops up on your cars’dashboard?
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