John Deere 003516.07: DEF Quality Sensor Has Detected A Problem With Something Covering The Sensor

The DEF Quality Sensor has detected an issue related to something covering the sensor. This may indicate a blockage, contamination, or physical obstruction affecting the sensor's ability to function properly.

1. 1

   The area around the DEF Quality Sensor for any visible obstruction or contamination

2. 2

   The condition of the sensor housing or cover if applicable

3. 3

   The integrity of the sensor's mounting or installation

1. 1

   Inspect

   Visually inspect the DEF Quality Sensor and the surrounding area for any physical obstruction, dirt, or contamination.

2. 2

   Clean

   If contamination is found, clean the sensor and the area around it using appropriate methods as specified in the service manual.

3. 3

   Verify

   After cleaning or addressing any obstruction, verify if the fault code persists.