SEAL-O-RING 4568678 - Caterpillar

Table 1
J1939 Code and Description CDL Code and Description Comments
3217-16
Aftertreatment #1 Intake O2 : High - moderate severity (2) E1407 (2)
High Aftertreatment #1 Intake O2 Concentration #1 The Engine Out NOx Sensor is reading a higher than expected level of Oxygen (O2).
3227-16
Aftertreatment #1 Outlet O2 : High - moderate severity (2) E1408 (2)
High Aftertreatment #1 Outlet O2 Concentration #1 The Tailpipe Out NOx Sensor is reading a higher than expected level of Oxygen (O2).
Table 2
Troubleshooting Test Steps Values Results
1. Check if the NOx Sensors are Installed Properly
NOx Sensors
Result: The sensor is installed properly.
Proceed to Test Step 2.
Result: The sensor is not installed properly.
Repair: Install the sensor properly. Refer to Special Instruction, REHS8151.
Proceed to Test Step 3.
2. Check for Exhaust Leaks
A. Start the engine.
B. Check the exhaust system for proper installation.
C. Check for loose or broken exhaust joints.
D. Inspect the exhaust system between the turbocharger outlet and the tailpipe outlet for signs of an exhaust leak.
Exhaust Leaks
Result: An exhaust leak was not found.
Proceed to Test Step 3.
Result: An exhaust leak was found.
Repair: Repair or replace the component causing the exhaust leak.
Proceed to Test Step 3.
3. Perform an "Aftertreatment NOx Sensor Functional Test"
A. Turn the keyswitch to ON.
B. Connect to the engine Electronic Control Module (ECM) using Cat® Electronic Technician (ET).
C. Start the engine.
D. Perform an "Aftertreatment NOx Sensor Functional Test" using Cat ET.
Test
Result: The "Aftertreatment NOx Sensor Functional Test" was successful.
Return the unit to service.
Result: The "Aftertreatment NOx Sensor Functional Test" was not successful.
Repair: Replace the failed sensor. Refer to Special Instruction, REHS8151.
Perform an "Aftertreatment NOx Sensor Functional Test" using Cat ET to verify the repair.