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So after having my nox sensor replaced for free from my dealer (warranty is now over) I used Carly for bmw to monitor my nox cat and it shows 680mg (max should be 400mg) of sulfur stored. after trying to do a regen it seems that sulphur content is increasing which could mean the nox cat is screwed. So i am now going to book in to have the Nox deleted and decat next week and have it re-dyno.
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