Deutz-Fahr 1904: DEF Quality Sensor Fault

The fault code indicates an issue with the DEF quality sensor, likely due to the presence of strongly diluted DEF or another liquid in the tank instead of proper DEF.

1. 1

   The contents of the DEF tank

2. 2

   The DEF quality sensor

3. 3

   The level and concentration of the fluid in the tank

1. 1

   Inspect the DEF tank

   Check the tank for the presence of strongly diluted DEF or any liquid other than DEF.

2. 2

   Clean the DEF tank

   If contamination is found, clean the tank thoroughly and refill with the correct DEF.

3. 3

   Test the DEF quality sensor

   Verify that the sensor is functioning properly after cleaning or replacing the fluid.