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Originally Posted by Rederick
Is it possible the ECUTEK stock rom is different than what my vehicle needs?
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No. There is no difference between a Ecutek ROM and a factory ROM, except your Ecutek license key is stored in the ROM too.
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I checked the codes and it comes up with P119F (caused the CEL) and P219A (historic fault).
Now I want to take it into the dealer and have them take a look
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Did you consider just clearing the faults and see if they return?
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I would ideally like to revert it completely to stock if possible.
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You would need Tactrix to overwrite the Ecutek stock ROM, which has your Ecutek license stored in it too. Note that you will lose the Ecutek license if you do so.