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Car showed code P0420 the other day so, I changed both o2 sensors reset with obd reader and it showed again then reset by unplugging battery and again it showed again today. Could it be my converter ? And not the o2 sensors ?
 

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Car showed code P0420 the other day so, I changed both o2 sensors reset with obd reader and it showed again then reset by unplugging battery and again it showed again today. Could it be my converter ? And not the o2 sensors ?
Hi MTLEADER. It could be a number of causes. See here: P0420 Catalyst System Efficiency Below Threshold

Let us know how you make out and good luck.
 
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