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How serious is the oxygen sensor to the maintainance of the vehicle

(2006 Hyundai Santa Fe)
in Charlottesville, VA on May 21, 2014
Concerned that check engine light comes on every so often, was told it could be the oxygen sensor, or not consistently using premium gas, or the gas cap not closed tightly.
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Popular Answer
on May 21, 2014
It is necessary.
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