emissions failed need all sensors on 2000 Hyundai Sonata

l sensors failed emissions check engine light on over
400.00 dollars to repair

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2 answers
There are many reasons a check engine light can come on, if you could post the codes that were stored, we could assist you better. There are also many sensors too, so more information is needed to help you.
I think you mean monitors? anyway, what are you being charged for?