Possible causes include sludge in oil pan causing oil pickup tube to be blocked partially, oil filter not changed at appropriate interval, bad oil sending unit (the sensor that screws into the engine case must be replaced), bad loose, dangling or broken wire leading to oil sensor damaged in recent repair.
Connect a scan tool to the OBD11 port. It might be signalling low pressure rather than low oil level. Very hazardous to the engine if it is.
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