DESCRIPTION:Selective Catalyst Reduction (SCR) Inlet NOx Sensor-Drift.

MONITORED PARAMETER:Engine in NOx.

TYPICAL ENABLING CONDITIONS:The following must be true for greater than 30 seconds:1. Fuel mass is equal to 0.2. Diesel Particulate Filter (DPF) outlet temperature is greater than 200°C (392°F).3. Battery voltage greater than 10 vDC.4. Engine speed between 500 to 2100 rpm.

MONITOR SEQUENCE:None

EXECUTION FREQUENCY:Continuous when enabling conditions met.

TYPICAL DURATION:5

DASH LAMPS:MIL

ENGINE REACTION:None

VERIFICATION:1. Insuring battery voltage greater than 10 vDC.2. Perform a stationary regeneration.3. Run the vehicle, fully loaded, down a grade or on a motored chassis dynamometer such that DPF outlet temperature is greater than 200°C (392°F) and fuel mass is 0 for greater than 30s.

NOTE: If any other EGR codes are active, fix those first.

PROBABLE CAUSES:1. Inspect the entire air inlet system, charge air cooler, and EGR piping/hoses.2. Check for failed injector.3. Check the aftertreatment system for leaks/damage.4. Perform a high idle regeneration.