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Hey guys I recently installed a catless DP and trying to avoid installing a downstream 02 extender by disabling P0420 in trifecta. It works for a day and then the CEL comes on with the same code I disabled. when I hook it up the setting shows all codes active. Do you know why it doesn’t save? I have the tune itself programmed to turn off and on via the cruise control button. Thanks in advance.
 

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Why would you care about the downstream sensor? Just install the extender so it won't throw a code and forget about it. A lot less fuss than you are having trying to circumvent it.
 
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