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<p>[QUOTE=&quot;DAX_, post: 11588305, member: 203682&quot;]Filled up def at flying j in Dallas on Thursday </p><p><br /></p><p><br /></p><p>Today(Sunday) I fill up on diesel again at pilot in Decatur Illinois </p><p><br /></p><p>About 30 minutes later I see my check engine light is on(not flashing on solid) and my low def warning light is on </p><p><br /></p><p>I look on the dash and that fault code number (3364) comes on, saying exactly &#039;After treatment diesel exhaust fluid quality - abnormal rate of change &#039;</p><p><br /></p><p>Then as I&#039;m typing this thread fault code 3521 comes on saying &quot;conditions exist&quot;</p><p><br /></p><p>I&#039;m running heavy, 45,000 pounds and have a 2020 freightliner so there is no regen button or regen override for me to press. The only thing I have is the regen I can click from the dashboard screen but that does not work </p><p><br /></p><p><br /></p><p>Any help[/QUOTE]</p><p><br /></p>

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