New factory Mazda OEM 1.8 liter engine coolant temperature sensor for ECU for NB Mazda Miata. This is the coolant temperature sender sensor that goes into the coolant outlet on the back of the cylinder head. This sensor sends the coolant temperature to the ECU. Sensor includes a new washer. Part numbers KLK1-18-840 (sensor) and 9956-41-200 (washer). Fits 1999-2005.
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