Description:

This error code indicates that the aftertreatment outlet NOx sensor is unable to accurately measure the nitrogen oxides (NOx) levels in the exhaust after it has passed through the emission control system. This issue can compromise the vehicle’s ability to meet emissions standards and may affect overall engine performance and efficiency.

Reaction:

The ECU may adjust the aftertreatment operations or enter a fault state to mitigate the impact of incorrect NOx level readings.

Recommendations:

• Inspect the NOx Sensor: Check for any physical damage or contamination that might affect the sensor’s function.
• Test Sensor Output: Use diagnostic tools to assess the accuracy of the sensor’s output against known NOx concentrations.
• Replace the Faulty Sensor: If testing confirms inaccuracies, replace the NOx sensor to restore reliable emissions monitoring.
• Clear Fault Codes and Reset ECU: After sensor replacement, clear any related fault codes and reset the ECU to ensure proper system operation.
• Verify Repair with Tests: Conduct tests under various operational conditions to ensure the new sensor provides accurate readings.

Note:

Continuous accurate measurement by the NOx sensors is crucial for ensuring compliance with emissions regulations and for the effective operation of aftertreatment systems.