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Q: 3 codes.P0420,P0011,P0021,what should I do? Replace or fix and if so what?
on 2006 Hyundai Sonata

Do I replace catalytic converter and O2 sensors?
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Wetry, I called my local dealer hear in Fort Myers, Florida. They said the cat system is 8 years or 80,000 miles.
Of course Kizzie will have to take it to the dealer to have it checked out. Of course Kizzie will be at the mercy of the dealer.

OH, by the way it's a COLD 75 degrees here, yuk-yuk-yuk.
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