the connector is corroded
Check your overflow bottle to make sure there is adequate coolant in there. If there is, the coolant level sensor is faulty and must be replaced.
Only if the sensor is malfunctioning.
vercoyanski syberiya
When the low coolant warning light comes on and the car has enough coolant, it usually means there is a problem with the coolant level sensor system. The sensor may need to be replaced.
There are two separate sensors that play here. the "coolant temperature sensor" and "coolant LEVEL sensor". I suggest confirming which of these was replaced, as it is very common for them to be confused. likely you will find the coolant sensor that was replaced was the one on the engine (temperature); The LEVEL sensor is mounted either in the coolant resivoir or in the radiator. Probably just need the proper sensor replaced.
You can test the engine coolant sensor by using an ohmmeter. Attach the positive and negative probes to the terminals of the coolant sensor.
The 1988 Honda Accord coolant temperature sensor can be found on the front of the engine. The coolant temperature sensor will be a few inches above the thermostat housing.
There are two separate sensors that play here. the "coolant temperature sensor" and "coolant LEVEL sensor". I suggest confirming which of these was replaced, as it is very common for them to be confused. likely you will find the coolant sensor that was replaced was the one on the engine (temperature); The LEVEL sensor is mounted either in the coolant resivoir or in the radiator. Probably just need the proper sensor replaced.
coolant temp sensor
Low coolant level or faulty coolant level senser. Did a radiator flush and replaced water bottle with sensor... still nothing.
The RX8 has a common problem with the coolant level sensor in the expansion tank. Unfortunately the sensor is part of the tank and so the whole unit needs to be replaced, a fairly easy job to do!
you may need to replace the sensor for the coolant, there should be a wire connected to it.