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What is the sensor above oil filter of a Honda Civic Ex 97 coupe?

The sensor above the oil filter of a Honda Civic Ex 97 coupe is the oil pressure sensor. This sensor monitors the oil pressure in the engine and sends a signal to the ECU (engine control unit) to adjust the fuel injection and ignition timing accordingly. If the oil pressure is too low, the ECU will retard the ignition timing and reduce the amount of fuel injected into the engine. This helps to protect the engine from damage.