Nox conversion low/def quality

Largely thanks to people like you putting your knowledge out there for the benefit of many. Thanks.

 

Thank You.

 

ON 2012 CASCADIA IT TOOK AROUND 6 MONTHS TO BAD OUTLET SENSOR CODE POP ON DASH . MAY BE ITS NOT FAILING COMPLETELY OR WHEM IT FAIL IT SUSPECT ON UR DEF QUALITY FIRST ......EVERTHING STARTED WITH BAD QUALITY AND LOW COVERSION AND CHANGING PARTS .SOME SAYS I NEED ONE BOX I FLUSH MY TANK AND FILLED WITH BOX DEF FLUID AND MY BAD QULITY GONE BUT LOW CONVERSION STILL THERE AND I DRIVE 6 MONTHS WITH LOW CONVERSION CODE ONLY ...IN BETWEEN I TRIED 3 TIMES TO FILL BULK DEF FROM PUMPS AND BAD QUALITY POPS EVERTIME .THEN FLUSH BACK AND PUT BOX FLUID IN .
AFTER DRIVIING 3 MONTHS ON BOX FLUID BAD OUTLET NOX SENSOR CODES POP UP AND I CHANGE .ALL IS GOOD AFTER THAT DRIVING SINCE 4 MONTHS...ON BULK DEF FLUID