Mazda B593-18-840A Genuine Engine Coolant Temperature Sensor

✔ Genuine Mazda B593-18-840A Engine Coolant Temperature Sensor — OEM Part ✔ Fitment: Select Mazda models (1993–2017) including Mazda 2, 3, 6, Protege, MX-6, Millenia, and more ✔ Direct replacement for factory coolant temperature sensor — no modifications required ✔ Manufactured to Mazda’s original specifications ✔ NTC Sensor design — ensures accurate coolant temperature readings for the ECU and gauge ✔ Green housing — matches factory color coding   Genuine Mazda B593-18-840A Engine Coolant Temperature Sensor An inaccurate or non-functioning temperature gauge, engine overheating without warning, radiator fans that do not switch on (or stay on constantly), or a check engine light with coolant temperature codes — these are common signs that your engine coolant temperature sensor is failing. The sensor measures the temperature of the engine coolant and sends this data to the ECU, which uses it to control fuel injection, ignition timing, and radiator fan operation. A faulty sensor can cause poor fuel economy, rough running, and potential engine damage from overheating. This is a factory-original Mazda engine coolant temperature sensor (OE part number B593-18-840A). It is a 2-pin NTC sensor with a green housing and M12 x 1.5 thread. The sensor comes with a seal ring and is designed for direct installation into the engine block or radiator. This is the same part sold at Mazda dealerships.