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Just got this 420 code on my 2004 Santa Fe 2.7L with 130K + miles. Timing belt was changed at 110K miles. Any suggestions on what to check or replace?
Thanks, Steve
 

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2007 Honda CRV
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P0420 is cat working below threshold
I would suspect O2 sensors either upstream or downstream or both
Cat is not a maintenance item. Should last.
Sometimes they do burn out. Caused by rich burning or lean burning or misfires, etc
 

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With 130k on the O2s I'd replaced both and get an sensor bung extender for the one after the cat.
 
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