Hi,
Since the light is coming on and the oil is full, I suspect the oil level sensor is bad, has a weak connection, or the wiring is damaged.
The oil level sensor on this vehicle is located on the bottom of the oil pan. Inspect wiring to it first as well as the connector. Once you confirm they are good, replace the sensor. That should take care of the issue.
The actual directions for replacement are in the attached pictures.
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2003 Mercedes Benz C 230 (203.040) L4-1.8L SC (271.948)
AR18.40-P-5112QK Remove/Install Oil Sensor
Vehicle Sensors and Switches Sensors and Switches - Engine Oil Level Sensor Service and Repair Removal and Replacement AR18.40-P-5112QK Remove/Install Oil Sensor
AR18.40-P-5112QK REMOVE/INSTALL OIL SENSOR
Remove/install oil sensor
See attached pictures.
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Let me know if this helps or if you have other questions.
Joe
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Saturday, January 11th, 2020 AT 5:35 PM