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fault 0420 code

fault code 0420
#1
i have a 2014 astra j gtc 1.4t, i keep getting a p0420 fault code , any ideas on what i should be looking for to rectify whatever problem it is , as soon as i clear the code my engine runs perfectly  then 2-3 days later it gets a misfire at about 2500-3000 rpm , thank you in advance
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#2
https://www.obd-codes.com/p0420

https://www.700r4transmissionhq.com/p0420-opel-astra/
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