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<p>[QUOTE=&quot;bjytech, post: 12237973, member: 129393&quot;]The quality sensor is part of the smart unit (tank level, temp, and quality) so generally it is either a DEF quality issue or the sensor is bad, which is common. they were on national backorder last I checked on one but its been a while, hopefully supply has gotten better.[/QUOTE]</p><p><br /></p>

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