Introduction to Water Temperature Sensor PW550541
The YZHIDIANF engine coolant temperature sensor PW550541 is a direct OE replacement for Hyundai vehicles. An NTC thermistor sealed in a corrosion-resistant housing feeds real-time coolant temperature to the ECU for fuel enrichment, ignition timing, and radiator fan control. A worn coolant temperature sensor causes hard cold starts, rich fuel mixtures, and P0115–P0119 fault codes. This plug-and-play unit replaces OE number PW550541 with no wiring changes, restoring accurate engine temperature data and normal fuel economy in under 20 minutes.
Parameter Table of Water Temperature Sensor PW550541
Parameter | Details |
Part Number | PW550541 |
Brand | YZHIDIANF |
Type | Coolant Temperature Sensor |
Vehicle Applications | Hyundai |
Sensor Technology | NTC thermistor |
Connector Type | OEM-standard sealed connector |
Housing Material | High-strength corrosion-resistant engineering plastic |
Operating Temperature Range | -40°C to 150°C (-40°F to 302°F) |
Response Time | Instant signal on temperature change |
Warranty | 12 Months |
Delivery Time | 3–7 Days |
Payment Terms | T/T, Western Union, PayPal |
Why Choose Our Water Temperature Sensor PW550541
Accurate NTC Thermistor Output
The thermistor tracks the OE resistance curve. Cold start enrichment and hot-idle fuel trim both rely on accurate temperature data. A sensor that drifts a few degrees causes the ECU to run the engine rich, wasting fuel over every tank.
Sealed Against Engine Bay Contamination
The connector body uses a rubber gasket to block moisture and road grime. Internal contacts are corrosion-resistant. This coolant temperature sensor holds stable output through seasonal temperature swings and engine bay humidity.
Drop-In Fit
Thread pitch, connector shell, and O-ring seat match the factory PW550541 part. Remove the old sensor, thread in the new one, plug in the connector. No splicing or adapter harnesses needed.
Batch-Tested Consistency
Each production lot is verified at multiple temperature points against the OE resistance specification. Units outside tolerance do not ship. When you stock these for workshop use, every sensor on the shelf behaves the same way.
12-Month Warranty
Every YZHIDIANF coolant temperature sensor ships with a 12-month warranty against manufacturing defects. Orders process within 24 hours and deliver in 3 to 7 business days.
Help Center
FAQ
Q1: Will a bad coolant temperature sensor cause my Hyundai to fail an emissions test?
Yes. A sensor that reads cold keeps the ECU in enrichment mode. The rich mixture raises hydrocarbon and carbon monoxide levels in the exhaust, which emissions tests measure directly. If your Hyundai has a pending P0115–P0119 code, replace the coolant temperature sensor before taking the test. After installation, drive through a full warm-up cycle to let the ECU complete its readiness monitors.
Q2: How is this different from the Hyundai coolant temperature sender for the dash gauge?
Hyundai vehicles often use two separate components: a coolant temperature sensor for the ECU and a temperature sender for the dash gauge. The PW550541 coolant temperature sensor feeds data to the ECU for fuel and ignition control. If your gauge reads incorrectly but the engine runs fine, the gauge sender may be the problem. If the engine runs poorly and the scan tool shows P0115 codes, this sensor is the fix.
Q3: Can I replace this coolant temperature sensor without draining the entire cooling system?
Yes. Position a rag under the sensor to catch the small amount of coolant that spills when you remove it. You will lose less than half a liter. After installing the new sensor, top off the radiator and reservoir to the full mark. Run the engine to operating temperature with the heater on to bleed trapped air, then recheck the level. No full drain required.
