Description:

This fault code is set when the DEF concentration sensor detects a malfunction within its system, impacting its ability to accurately measure the DEF concentration. This error may arise from sensor failure, incorrect sensor calibration, or electrical issues affecting the sensor’s operation.

Reaction:

The ECU may engage fallback measures regarding DEF dosing, potentially altering emission control strategies to maintain compliance with environmental regulations.

Recommendations:

• Diagnose Sensor Error: Utilize specialized diagnostic tools to determine the nature of the error affecting the DEF concentration sensor.
• Inspect and Test Sensor System: Check the sensor and its associated circuitry for any signs of malfunction or failure.
• Calibrate or Replace Sensor: If the sensor is found to be out of calibration or defective, recalibrate it or replace it.
• Reset ECU and Conduct Comprehensive Testing: After addressing the issue, reset the ECU and perform a thorough testing regime to ensure the sensor operates correctly and provides reliable readings.

Note:

Accurate DEF concentration measurement is vital for the proper functioning of the aftertreatment system. Regular sensor checks and maintenance are recommended to avoid errors that could lead to emission control failures.