The error code 15733 P20EE SCR NOx catalyst effect too low indicates a fault in the SCR system. To determine the cause, an SCR dosage quantity check should be carried out. This checks whether the AdBlue injection valve for reducing agents is working properly. This is a useful test to diagnose and troubleshoot problems with the SCR system. However, it should be noted that the NOx catalyst cannot always be identified as the source of the error.
The video shows that the AdBlue injection valve does not receive any pressure, although the SCR pump builds up the pressure correctly. You can see this in the measured values.
Measuring Values:
IDE03129 Reducing agent
IDE03131 Reducing agent injector
IDE03132 Pressure sensor for reducing agent
IDE03135 Sensor for reducing agent tank temp
IDE03136 Sensor for reducing agent fill level
#SCR #AdBlue #VCDS
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