i08198179
Clean Emissions Module Has
High Oxygen Level
Table 21
Diagnostic Trouble Codes
J1939 Code PDL Code
Code Description
(code descriptions may vary)
Comments
3217-16
E1407 (2)
Aftertreatment #1 Intake O2 : High -
moderate severity (2)
The Engine Out NOx Sensor is reading a higher than ex-
pected level of Oxygen (O2).
3227-16
E1408 (2)
Aftertreatment #1 Outlet O2 : High -
moderate severity (2)
The Tailpipe Out NOx Sensor is reading a higher than ex-
pected level of Oxygen (O2).
Follow the troubleshooting procedure to identify the root cause of the problem.
Diesel Oxidation Catalyst (DOC)/Selective
Catalytic Reduction (SCR) Aftertreatment
The SCR intake NOx sensor is located in the exhaust
pipe between the Exhaust Back Pressure Regulator
(EBPR) and the DOC inlet. The SCR outlet NOx
sensor is located in the exhaust tail pipe.
DOC/Diesel Particulate Filter (DPF)/SCR
Aftertreatment
The SCR intake NOx sensor is located in the Clean
Emissions Module (CEM) after the DPF. The SCR
outlet NOx sensor is located in the exhaust tail pipe.
The exhaust system has two NOx sensors that
measure O2 and NOx. The inlet sensor monitors the
NOx and O2 entering the SCR catalyst. The outlet
sensor monitors the NOx and O2 exiting the SCR
catalyst.
Complete the procedure in the order in which the
steps are listed.
UENR4469-36 81
Symptom Troubleshooting
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