{"product_id":"honda-r18a-d17a-l15a-water-temerature-sensor-37870-plc-004","title":"Honda R18A\/D17A\/L15A Water Temperature Sensor 37870-PLC-004","description":"\u003cul\u003e\n\u003cli\u003eGenuine Honda Product \u003c\/li\u003e\n\u003cli\u003eDirect Factory Replacement Part \u003c\/li\u003e\n\u003cli\u003eFits R18A, L15A, and D17A Engines \u003c\/li\u003e\n\u003cli\u003eCompatible with 01-11 Civic DX\/EX\/LX and 07-08 Fit \u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c!-- split --\u003e\n\u003cul class=\"tabs\"\u003e\n\u003cli\u003e\u003ca class=\"active\" href=\"#Description\"\u003eDescription\u003c\/a\u003e\u003c\/li\u003e\n \u003cli\u003e\u003ca href=\"#VehicleFitment\"\u003eVehicle Fitment\u003c\/a\u003e\u003c\/li\u003e   \u003cli\u003e\u003ca href=\"#Included\"\u003eIncluded\u003c\/a\u003e\u003c\/li\u003e \u003c\/ul\u003e\n\u003cul class=\"tabs-content\"\u003e\n\n\n\u003cli class=\"active\" id=\"Description\"\u003e\n\u003ch3\u003eHonda OEM Water Temperature Sensor - R18A \/ D17A \/ L15A Engines\u003c\/h3\u003e\n\n\u003cp\u003eYour Civic or Fit is running hot. The temp gauge is climbing higher than it should or you're getting a temperature warning light. You pull over and the engine feels fine. There's no steam coming out of the radiator. The cooling system's not actually overheating. The problem's the water temperature sensor. It's failing. It's sending bad readings to the ECU and the gauge. The ECU's thinking the engine's hot when it's not. Or it's thinking the engine's cold when it's actually running at temperature. This is genuine Honda OEM part 37870-PLC-004. It's the correct water temperature sensor for R18A, D17A, and L15A engines. The sensor threads into the engine and reads the coolant temperature. It sends that signal to the ECU and the gauge. When it fails you get false readings. Replace the sensor when you're getting temperature warnings or high gauge readings with no actual overheating.\u003c\/p\u003e\n\n\u003ch4\u003eHere's Why Water Temperature Sensors Fail\u003c\/h4\u003e\n\n\u003cp\u003eThe water temperature sensor threads into the engine block where hot coolant flows past it constantly. The sensor's got a thermistor inside that changes resistance based on temperature. As the coolant heats up the resistance changes. The ECU reads that resistance and translates it into a temperature value. After 15+ years the thermistor degrades. The internal connections corrode. The sensor stops reading correctly. It starts sending erratic signals. The ECU gets confused. The gauge goes crazy. Sometimes it reads hot when the engine's cool. Sometimes it reads cold when the engine's hot. Sometimes it fluctuates wildly. You're staring at a temperature gauge that doesn't make sense. Meanwhile the engine's running at normal temperature the whole time. The sensor's just lying about what the temperature is. Replace the sensor and the gauge stabilizes. The readings become accurate again.\u003c\/p\u003e\n\n\u003ch4\u003eTemperature Gauge Lying to You - Don't Panic\u003c\/h4\u003e\n\n\u003cp\u003eIf your temperature gauge is climbing into the hot zone but the engine doesn't feel hot and there's no steam and the radiator's not pressurized then the sensor's probably failing. We've seen people panic thinking their engine's overheating. They pull over. They let it cool. They check the radiator. Everything's fine. The engine's running at normal temperature. But the gauge keeps saying it's hot. That's a bad temperature sensor. Don't ignore the gauge reading but don't panic either. If you're actually overheating you'll see steam. You'll smell coolant. The radiator will be hot to the touch. If you're not seeing those signs but the gauge is high the sensor's probably bad. Replace it and the gauge will read correctly. We've also seen sensors that read too cold. The gauge stays in the cold zone even after the engine's warmed up. The heater takes forever to blow hot air. The ECU thinks the engine's still warming up so it's running rich. You're getting worse fuel economy and the engine's running sluggish until it warms up. That's a bad temperature sensor too. Replace it.\u003c\/p\u003e\n\n\u003ch4\u003eHonda OEM Sensor - The Right Thermistor\u003c\/h4\u003e\n\n\u003cp\u003eThis is genuine Honda OEM part 37870-PLC-004. It's the water temperature sensor Honda installs on R18A, D17A, and L15A engines at the factory. The thermistor's the correct resistance curve for these engines. The thread size matches the engine block perfectly. The connector matches the wiring harness. It plugs in and sends accurate signals. Aftermarket temperature sensors are cheaper. Some are fine. Some are garbage. We've seen aftermarket sensors with thermistors that have the wrong resistance curve. They read high or they read low or they fluctuate. The gauge doesn't work correctly. We've seen cheap sensors that fail after 10,000 miles because the thermistor's cheap material. We've seen sensors with corroded connectors that cause intermittent signals. The water temperature sensor is critical for engine operation. The ECU uses the temperature reading to adjust fuel mixture and ignition timing. If the sensor's sending wrong signals the engine runs wrong. It's not where you buy a generic sensor and hope the reading's close. Buy the Honda sensor. It's engineered for your engine. It reads correctly. You install it once and the temperature gauge works right.\u003c\/p\u003e\n\n\u003ch4\u003eWhat You Get\u003c\/h4\u003e\n\n\u003cul\u003e\n  \u003cli\u003eHonda OEM water temperature sensor - part number 37870-PLC-004\u003c\/li\u003e\n  \u003cli\u003eFits R18A, D17A, L15A engines\u003c\/li\u003e\n  \u003cli\u003eGenuine Honda sensor - not aftermarket\u003c\/li\u003e\n  \u003cli\u003eDirect replacement\u003c\/li\u003e\n  \u003cli\u003eOne sensor per order\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eFits These Cars\u003c\/h4\u003e\n\n\u003cul\u003e\n  \u003cli\u003e2006-2011 Honda Civic DX\/EX\/LX (R18A engine)\u003c\/li\u003e\n  \u003cli\u003e2001-2005 Honda Civic DX\/EX\/LX (D17A engine)\u003c\/li\u003e\n  \u003cli\u003e2007-2008 Honda Fit (L15A engine)\u003c\/li\u003e\n  \u003cli\u003e2006-2008 Acura TSX (R18A engine)\u003c\/li\u003e\n  \u003cli\u003e2006-2007 Honda S2000 (F22C engine)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Water temperature sensor for R18A, D17A, L15A engines. Genuine Honda OEM part 37870-PLC-004. Threads into engine block. Reads coolant temperature and sends signal to ECU and temperature gauge. Failed sensor causes false temperature readings, inaccurate gauge, temperature warning lights. Symptoms: temperature gauge reading hot with no actual overheating, gauge reading cold when engine warm, gauge fluctuating wildly, heater taking long time to warm up, poor fuel economy. Replace when getting false temperature readings. Don't panic if gauge is high but engine feels normal and no steam present - likely bad sensor. One sensor per order.\u003c\/p\u003e\n\u003c\/li\u003e\n\n \n\u003cli id=\"VehicleFitment\"\u003e\n 2006-2008 Acura TSX\u003cdiv\u003e2001-2005 Honda Civic DX\/EX\/LX\u003c\/div\u003e\n\u003cdiv\u003e2006-2011 Honda Civic DX\/EX\/LX\u003c\/div\u003e\n\u003cdiv\u003e2007-2008 Honda Fit\u003c\/div\u003e\n\u003cdiv\u003e2006-2007 Honda S2000\u003c\/div\u003e \n\u003c\/li\u003e\n\n\n\n\n\n\n \n\u003cli id=\"Included\"\u003e\n(1) Water Temperature Sensor\n\u003c\/li\u003e\n\n\n\n\n\n\n\n\n\n\n\n\n\u003c\/ul\u003e\n","brand":"Honda","offers":[{"title":"Default Title","offer_id":45521603297314,"sku":"OHA-37870-PLC-004","price":94.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2218\/5701\/files\/OHA-37870-PLC-004_naak.jpg?v=1779986030","url":"https:\/\/www.hybrid-racing.com\/products\/honda-r18a-d17a-l15a-water-temerature-sensor-37870-plc-004","provider":"Hybrid Racing","version":"1.0","type":"link"}