John Deere 003516.01: DEF Quality Sensor Indicates Low Quality DEF Sample

The DEF Quality Sensor has detected a low quality DEF sample. This indicates that the diesel exhaust fluid being used may not meet the required standards, which could affect emissions performance and engine operation.

1. 1

   The quality and integrity of the DEF sample in the tank

2. 2

   The condition and functionality of the DEF Quality Sensor

3. 3

   The presence of contamination or incorrect DEF in the system

1. 1

   Verify the DEF sample

   Check the DEF for signs of contamination, incorrect concentration, or improper storage.

2. 2

   Inspect the DEF Quality Sensor

   Check the sensor for damage, corrosion, or improper installation.

3. 3

   Replace the DEF if necessary

   If the DEF is found to be of low quality, drain and replace it with certified, high-quality DEF.