Cummins Temperature Sensor 4384578 4384578NX

Maintain accurate temperature monitoring and reliable engine performance with this aftermarket Temperature Sensor designed for select Cummins EPA21 applications. Engineered to measure critical engine and exhaust temperatures, this sensor helps support proper system operation, optimize efficiency, and protect against overheating. Built to withstand demanding operating conditions and high-temperature environments, it delivers consistent, dependable readings and long-lasting durability. Its direct-fit design allows for quick installation and seamless integration with the factory system.

Specifications

• OEM Replacement Part Numbers: 4384578, 4384578NX
• Emission Standard: EPA21
• Sensor Type: Temperature Sensor
• Designed for Cummins Engine and Emission System Applications
• Monitors Critical Engine and Exhaust Temperatures
• Helps Maintain Proper System Performance and Efficiency
• Provides Accurate and Consistent Temperature Readings
• Built for High-Heat and Heavy-Duty Operating Conditions
• Direct-Fit Aftermarket Replacement

Fitment

Verify OEM number prior to purchase.

Fits the following models:

• Select Cummins engines
• Applications requiring an EPA21-compliant temperature sensor

Direct aftermarket replacement for OEM #s:

• 4384578
• 4384578NX
• 4384578RX
• A054U506

Important Information

• Returns are accepted within 30 days after receipt of product with a valid RMA number.
• Returns are subject to a 25% restocking fee.
• Damaged returns are subject to refusal.
• See our Return Policy for more information and instructions to set up a return.
• California Prop 65 WARNING: This product may expose you to a chemical known to the State of California to cause cancer and birth defects or other reproductive harm.
• Verify OEM number(s) before ordering to ensure proper fitment.
• Any mention of OEM names, numbers, or descriptions is for identification and compatibility verification purposes only and does not imply the product is an OEM part.

For questions or help finding a part, reach out to customer service at 833-773-3039.