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Super Moderator
2020 Prius Prime Limited
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Check your fuel cap to see if it is sealed correctly: check that gasket on it, etc. 0420 code recommends that if you get other codes with it that you correct those first, and 0440/0441 suggest fuel cap issues (among other things). That is an easy thing to check or replace (get new cap from AutoZone or similar).
 
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