ECU 000098.12 – Engine Oil Level Sensor Fault. John Deere Engine Control.

ECU 000098.12 (ECU 98.12)

Code: 000098.12

Shortcode: 98.12


The ECU 000098.12 (98.12) error code reports a fault with the engine oil level sensor on John Deere machinery, indicating that the sensor is not functioning correctly. This could be due to sensor failure, wiring issues, or a problem with the sensor’s calibration.


The engine control unit may fail to accurately monitor and report engine oil levels, potentially leading to engine operation under unsafe oil conditions if not addressed.


  • Inspect and Test the Oil Level Sensor: Evaluate the condition and functionality of the oil level sensor to identify any failures or inaccuracies.
  • Check and Repair Wiring and Connections: Look for and repair any damages or loose connections in the wiring leading to the sensor.
  • Replace the Sensor if Necessary: If testing confirms the sensor is defective, replace it with a new, OEM part.
  • Calibrate and Test the System: After replacement, recalibrate the sensor settings and perform a full system test to ensure accurate oil level monitoring.


Maintaining the engine oil level sensor in optimal condition is crucial for engine health. Regular checks and prompt replacement of faulty sensors help prevent serious engine issues.

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