Massey Ferguson E4090.16 – Engine Control Unit (ECU): NOx Are High In The Exhaust

The Selective Catalytic Reduction (SCR) system is failing to reduce Nitrogen Oxide (NOx) emissions to the permitted threshold.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• MF 4707
• MF 4708
• MF 4709
• MF 4710
• MF 5608
• MF 5609
• MF 5610
• MF 5611
• MF 5612
• MF 5613
• MF 5710 SL
• MF 5711 SL
• MF 5712 SL
• MF 5713 SL
• MF 7614
• MF 7615
• MF 7616
• MF 7618
• MF 7619
• MF 7620
• MF 7622
• MF 7624
• MF 7626
• MF 7714
• MF 7715
• MF 7716
• MF 7718
• MF 7719
• MF 7720
• MF 7722
• MF 7724
• MF 7726

1. 1

   Check for accompanying codes related to DEF system pressure, DEF metering pump faults, urea quality, or DEF pipe heater resistance (e.g., E4332.11, E4342.04).

2. 2

   Verify DEF/AdBlue quality and level to ensure the tank has adequate, uncontaminated fluid.

3. 3

   Check the NOx sensor signal using a diagnostic tool for irregular signals, missing signals, or out-of-range voltage.

4. 4

   Inspect the NOx sensor wiring harness and connectors for rub points, open circuits, or shorts to ground.

1. 1

   Perform a System Regeneration

   If no other hardware faults are present, utilize the tractor's manual regeneration system to allow the SCR system to burn off soot and attempt to normalize emissions.

2. 2

   Address Root Causes

   If accompanying codes point to a DEF dosing issue (like a blocked injector or failed pump), repair those components first.

3. 3

   Replace the NOx Sensor

   If the NOx sensor is determined to be faulty, reading inaccurately, or has failed internally, remove the old sensor from the exhaust stream and install a replacement.

4. 4

   Clear Codes and Test

   Clear the E4090.16 code from the ECU and perform a test run under load to verify that the NOx emissions value returns to permitted levels.