The APDTY 144255 Coolant Temperature Sensor (CTS) is a direct-replacement engine management sensor that monitors coolant temperature and sends critical data to your vehicle's ECU. This sensor replaces OE part numbers MD177572, MD182467, 1580487, 2132761, and aftermarket equivalents TS337/TS337T. When your CTS fails, you may experience check engine lights, poor fuel economy, rough idle, or inaccurate temperature gauge readings.
Key Takeaways
- Direct replacement for OE numbers MD177572, MD182467, 1580487, 2132761, TS337, TS337T
- Monitors engine coolant temperature for proper fuel mixture and timing control
- Symptoms of failure include check engine light, overheating, rough idle, and poor fuel economy
- Check vehicle compatibility chart on the product page before ordering
- Installation requires coolant drain and proper torque specifications
Buy APDTY 144255 directly from APDTY
What Does the Coolant Temperature Sensor Do?
The coolant temperature sensor (CTS) is a critical engine management component that measures the temperature of your engine's coolant. The sensor sends a resistance-based signal to the engine control unit (ECU), which uses this data to:
- Adjust fuel injection timing and air-fuel mixture for optimal combustion
- Control cooling fan operation
- Regulate idle speed during warm-up
- Provide accurate temperature gauge readings to the dashboard
- Trigger cold-start enrichment protocols
The APDTY 144255 uses a thermistor element that changes electrical resistance as coolant temperature varies. When coolant is cold, resistance is high; as temperature increases, resistance decreases. The ECU interprets these resistance changes to determine precise engine temperature.
What Are the Symptoms of a Failing Coolant Temperature Sensor?
A faulty CTS can trigger multiple driveability issues and warning lights. Common symptoms include:
- Check Engine Light (CEL): Diagnostic codes P0115, P0116, P0117, P0118, or P0119 related to coolant temperature circuit faults
- Poor Fuel Economy: ECU may run rich mixture due to incorrect temperature reading
- Rough Idle or Stalling: Especially when cold, as the ECU cannot properly manage cold-start fuel delivery
- Overheating or Overcooling: Cooling fans may not activate properly, or may run continuously
- Inaccurate Temperature Gauge: Dashboard gauge reads too high, too low, or fluctuates erratically
- Hard Starting: Particularly in cold weather when proper fuel enrichment is critical
- Failed Emissions Test: Incorrect fuel mixture can increase emissions output
If you experience any of these symptoms alongside a check engine light, scan for diagnostic trouble codes and inspect the coolant temperature sensor for corrosion, damaged wiring, or coolant leaks at the sensor housing.
Which Vehicles Does the APDTY 144255 Fit?
The APDTY 144255 coolant temperature sensor replaces the following OE and aftermarket part numbers:
| Part Number | Type |
|---|---|
| MD177572 | OE Manufacturer |
| MD182467 | OE Manufacturer |
| 1580487 | OE Manufacturer |
| 2132761 | OE Manufacturer |
| TS337 | Aftermarket |
| TS337T | Aftermarket |
Important: Vehicle fitment varies by year, make, model, and engine configuration. The part numbers above are used across multiple vehicle applications. Always verify fitment using the compatibility chart on the APDTY product page before ordering. Do not rely on part number cross-reference alone—confirm your specific vehicle is listed in the fitment data.
APDTY 144255 Specifications and Features
The APDTY 144255 is manufactured to meet or exceed OE specifications for reliable engine temperature monitoring:
| Specification | Detail |
|---|---|
| APDTY Part Number | 144255 |
| Sensor Type | Coolant Temperature Sensor (CTS) |
| Replaces OE Numbers | MD177572, MD182467, 1580487, 2132761 |
| Replaces Aftermarket | TS337, TS337T |
| Sensor Technology | Thermistor (Negative Temperature Coefficient) |
| Construction | Corrosion-resistant housing with sealed electrical connector |
| Warranty | Check APDTY.com for current warranty terms |
This sensor is designed for direct replacement installation, using the factory mounting location and electrical connector. No modifications or adapters are required when installed on compatible vehicles.
How to Install the APDTY 144255 Coolant Temperature Sensor
Important Safety Notes: Perform this repair only when the engine is completely cold. Hot coolant can cause severe burns. Always wear safety glasses and gloves. Dispose of coolant according to local environmental regulations—never pour coolant down drains or onto the ground.
General Installation Overview:
- Prepare the Vehicle: Ensure the engine is cold. Disconnect the negative battery cable to prevent electrical shorts.
- Locate the Sensor: The coolant temperature sensor is typically located in the thermostat housing, intake manifold, or cylinder head coolant passage. Consult your vehicle's service manual for the exact location.
- Drain Coolant: Place a drain pan under the radiator. Open the radiator petcock or remove the lower radiator hose to drain coolant below the sensor level. You may not need to drain the entire system—just enough to drop the level below the sensor.
- Disconnect the Electrical Connector: Press the release tab and carefully pull the connector from the old sensor. Inspect the connector terminals for corrosion or damage.
- Remove the Old Sensor: Use an appropriately sized wrench or socket (size varies by application—commonly 19mm or 3/4"). Unscrew the sensor counterclockwise. Expect a small amount of coolant to drain from the port.
- Prepare the Installation: Clean the sensor threads and sealing surface. Apply a thin coat of thread sealant or Teflon tape to the threads of the new sensor if your application requires it (check service manual—some sensors have pre-applied sealant or use tapered threads that seal without sealant).
- Install the APDTY 144255: Thread the new sensor by hand to avoid cross-threading. Tighten to manufacturer torque specification (typically 8-12 lb-ft, but verify in your service manual). Do not overtighten—this can crack the sensor housing or damage threads in aluminum castings.
- Reconnect Electrical Connector: Push the connector onto the new sensor until it clicks into place.
- Refill Coolant: Close the radiator drain and refill the system with the manufacturer-specified coolant mixture. Run the engine with the radiator cap off (if design permits) to bleed air from the system. Top off coolant as needed.
- Test and Clear Codes: Reconnect the battery. Start the engine and allow it to reach operating temperature. Verify the temperature gauge reads normally and the check engine light does not return. Use a scan tool to clear any stored diagnostic codes and confirm the new sensor is reading properly.
If you are not comfortable performing this repair, consult a qualified automotive technician. Incorrect installation can result in coolant leaks, overheating, or engine damage.
Frequently asked questions
Will the APDTY 144255 work on my vehicle?
The APDTY 144255 replaces OE part numbers MD177572, MD182467, 1580487, 2132761, TS337, and TS337T, which are used across multiple vehicle applications. Check the compatibility chart on the APDTY product page to confirm fitment for your specific year, make, model, and engine.
Can I replace the coolant temperature sensor without draining all the coolant?
Yes, in most cases you only need to drain coolant to a level below the sensor. This is typically 1-2 quarts. However, if your coolant is old or contaminated, consider performing a full coolant flush while the sensor is out.
What diagnostic codes indicate a bad coolant temperature sensor?
Common codes include P0115 (CTS circuit malfunction), P0116 (CTS range/performance), P0117 (CTS circuit low input), P0118 (CTS circuit high input), and P0119 (CTS intermittent). Always verify the sensor with a multimeter test before replacement, as wiring issues can also trigger these codes.
Do I need to use thread sealant on the APDTY 144255?
This depends on your vehicle's design. Some sensors use tapered pipe threads that seal metal-to-metal without sealant. Others require thread sealant or have pre-applied sealant. Check your vehicle's service manual or inspect the old sensor threads for existing sealant before installation.
The APDTY 144255 Coolant Temperature Sensor provides a reliable, cost-effective solution for restoring proper engine temperature monitoring in vehicles using OE part numbers MD177572, MD182467, 1580487, 2132761, TS337, or TS337T. By replacing a failing CTS, you can eliminate check engine lights, restore fuel economy, improve cold-start performance, and prevent overheating issues. Always verify vehicle compatibility using the fitment chart on the APDTY product page, and follow proper installation procedures to ensure a leak-free, long-lasting repair. For questions about fitment or installation, contact the APDTY customer service team before ordering.