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StandarStandardDieselParts comdDieselParts com JUST THE FACTS DIESEL Diesel Nitrogen Oxide NOx Sensors The Most Comprehensive NOx sensor Program in The Aftermarket 18 COVER AGE Covering more than 5 million repair opportunities Growing line of NOx sensors Required for emissions regulation A High Failure Part That s Required for Emissions Regulations NOx sensors monitor the level of nitrogen oxide being emitted by a diesel vehicle to ensure compliance with emissions regulations Common causes of failure include soot buildup on the sensor ECU water intrusion and or damage to the cable which will cause the check engine light to illuminate NOX011 Upstream NOX012 SCR Catalyst Outlet Ram Trucks w Ram Trucks w 6 Cyl 6 7L Engines 2018 13 6 Cyl 6 7L Engines 2017 14 NOX013 Turbo Outlet Pipe NOX014 Upstream NOX016 Upstream NOX017 Downstream Ram Trucks 2018 13 Ram Trucks 2017 14 Mercedes Benz Trucks Mercedes Benz Trucks VIO Over 224 000 VIO Over 131 000 2016 13 2018 13 VIO Over 65 000 VIO Over 278 000 EXCLUSIVE AFTERMARKET EXCLUSIVE AFTERMARKET StandarStandardDieselParts comdDieselParts com Adjust shadow opacity as you size down ex 24 box 30 2 box 25 etc A CENTURY OF EXCELLENCE NOx sensor 1 measures engine out NOx NOx sensor 2 measures NOx levels exiting the SCR catalyst JUST THE FACTS DIESEL About NOx Sensors Below is a diagram of a generic Selective Catalytic Reduction SCR system used on light duty diesel passenger trucks The assembly uses two NOx sensors The SCR assembly contains a catalyst brick that requires DEF or diesel exhaust fuid for activation A PCM controlled pump and doser valve are used to meter DEF into the exhaust system upstream of the SCR brick With the exhaust heat the DEF will decompose into ammonia and carbon dioxide If too much DEF is injected into the exhaust the SCR brick can become saturated with ammonia and some of it will exit the SCR assembly This is called ammonia slip Ammonia and NOx look the same to a NOx sensor Ammonia slip will cause the downstream NOx sensor to report an incorrect amount of NOx in the exhaust stream Is the NOx sensor is reporting NOx levels correctly While addressing SCR codes concerning DEF quality NOx sensor failure or SCR effciency it may be necessary to burn out saturated SCR bricks and run the onboard diagnostic again This can be accomplished by performing a manual DPF regen The heat produced during the manual regen will remove ammonia from the SCR bricks and allow for a more accurate onboard SCR system diagnostic NOx Sensor Repair Tips A degraded doser valve DEF injector may set NOx DTCs Be sure to test the doser valve before replacing NOx sensors After replacing a NOx sensor be sure to check service information for any reset procedures NOx sensors can t tell the difference between NOx and ammonia Performing a DPF regen will release ammonia from the SCR catalyst ST10235D NOX MAR20
