New Holland 118-12 – ECU: Oil Pressure Sensor Failure - Bad Intelligent Device or Component

The Engine Control Unit (ECU) has detected a failure related to the engine oil pressure sensor, specifically indicating a problem with the intelligent device or component associated with it. This means the ECU can no longer trust the data provided by the sensor, which could be caused by an internal failure of the sensor itself, a wiring issue, or the sensor sending implausible signals to the control module.

• T4
• T5
• T6
• T7
• T6000
• T7000
• TD
• TN
• TLA
• TSA
• L-series
• LS-series
• LS170
• LX-series
• CR
• CX
• Wheel loaders
• Backhoe loaders

1. 1

   Verify actual oil pressure by temporarily installing a mechanical oil pressure gauge to rule out a genuine low oil pressure problem (which can cause catastrophic engine damage)

2. 2

   Inspect wiring harness and connectors leading to the oil pressure sensor for chafing, breaks, corrosion, or loose connections (check continuity to the ECU if applicable)

3. 3

   Check engine oil level and condition to ensure low oil is not triggering the warning

4. 4

   Inspect engine oil filters for clogs that could restrict oil flow and cause a pressure drop

1. 1

   Locate the sensor

   Find the oil pressure sensor, which is typically threaded into the engine block or the oil filter housing depending on the engine model.

2. 2

   Disconnect electrical connector

   Carefully detach the electrical connector from the faulty oil pressure sensor.

3. 3

   Remove the old sensor

   Using the appropriate size wrench, unscrew and remove the old sensor from the engine. Be prepared for a small amount of oil to leak out.

4. 4

   Prepare the new sensor

   Apply a suitable thread sealant rated for oil contact to the threads of the new sensor, being careful not to block the pressure port.

5. 5

   Install and tighten

   Thread the new sensor into place and tighten it to the manufacturer's specified torque. Do not overtighten.

6. 6

   Reconnect wiring

   Securely attach the electrical connector to the newly installed sensor.

7. 7

   Clear fault codes

   Use a diagnostic tool to clear the 118-12 fault code from the Engine Control Unit (ECU).

8. 8

   Verify the repair

   Start the engine and let it run for a few minutes. Check for any oil leaks around the new sensor and ensure that the fault code does not reappear.