Massey Ferguson 5028.13 – Engine Control Unit (ECU): Issue With DOC NOx Sensor Module. (ECU)

This indicates a malfunction, communication failure, or out-of-range signal regarding the Nitrogen Oxide (NOx) sensor module located at the Diesel Oxidation Catalyst (DOC). The sensor is responsible for measuring the amount of NOx in the exhaust gas to ensure the emissions system is operating correctly.

• 4710
• 7724S
• 5712SL
• 7722S
• 7722
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 4708
• 7726S
• 4707
• 4709
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• T4 (2015-2021)
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 5710 SL
• 5711 SL
• 5712 SL
• 5713 SL
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626

1. 1

   Inspect the DOC NOx sensor and its interface module for physical damage.

2. 2

   Check the wiring harness leading to the NOx sensor module for chafed wires, melted insulation, or loose clips.

3. 3

   Disconnect the in-line electrical connector and check for corrosion, moisture, or bent pins.

4. 4

   Inspect the exhaust piping around the DOC and the sensor thread for soot trails, which indicate exhaust leaks that can skew sensor readings.

5. 5

   Use a diagnostic tool (such as Jaltest or an AGCO dealer tool) to clear the code and run the engine to see if the code returns actively.

1. 1

   Preparation

   Shut off the engine, apply the parking brake, and allow the exhaust system to cool completely to avoid burns.

2. 2

   Disconnect Battery

   Disconnect the machine's battery to prevent electrical shorts.

3. 3

   Disconnect Wiring

   Locate the DOC NOx sensor module. Detach the wiring harness from its retaining clips and disconnect the nitrogen oxide (NOx) module electrical connector.

4. 4

   Remove Sensor

   Use the appropriate sensor socket or wrench to carefully unthread the NOx sensor from the exhaust pipe/DOC housing.

5. 5

   Install New Sensor

   Apply a small amount of anti-seize to the threads of the new sensor (if not pre-applied by the manufacturer) and thread it into the exhaust housing. Tighten to the manufacturer's specified torque.

6. 6

   Reconnect

   Reconnect the electrical connector and secure the wiring harness back into its clips to keep it away from hot exhaust components.

7. 7

   Clear Codes

   Reconnect the battery, turn the key on, and use a diagnostic scanner to clear the 005028.13 fault code. Run the engine to verify the repair.