Description:

This diagnostic trouble code indicates that the NOx-based EGR flow correction factor has reached a level significantly low enough to suggest that tailpipe NOx emissions are out of compliance with environmental regulations. This situation points to an underperforming EGR system, potentially leading to higher NOx emissions.

Reaction:

The ECU may initiate corrective actions to increase EGR flow or modify other engine parameters to bring NOx emissions back into compliance.

Recommendations:

• Inspect EGR Valves and Sensors: Check for any malfunctioning EGR valves or sensors that could affect the flow and control of exhaust gases.
• Calibrate EGR System: Ensure that the EGR system is correctly calibrated to the engine’s operating conditions and emission requirements.
• Perform NOx Sensor Tests: Test the functionality of NOx sensors and replace them if they fail to provide accurate readings.
• Review Engine Tuning and Settings: Adjust engine settings that impact NOx production and EGR effectiveness.
• Consult Emission Compliance Guidelines: Refer to the latest emission standards and ensure the engine is set up to meet these specifications.

Note:

Adherence to NOx emission standards is crucial for environmental compliance and to avoid potential regulatory penalties. Regular checks and calibration of EGR and related systems are essential for maintaining compliance.