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If the check engine light comes on in your Mercedes Sprinter, the first step is to pull over immediately to avoid causing further damage to your vehicle. Once stopped, you can utilize an OBD II scan tool to retrieve the stored codes in the ECU that triggered the light. If you come across code P20E8, this indicates an issue with the reductant pressure sensor, which monitors the DEF fluid pressure entering the exhaust system. A low pressure reading suggests that the fluid is not effectively cleaning the exhaust. This may point to a problem with the DEF pump that requires fixing.
In a Mercedes-Benz Sprinter, error code P20E8 means that the pressure of the emission-reducing fluid is too low.