Peterbuilt/ Kenworth Cummins X15 DEF Sensor

Accurate Emissions Monitoring: Peterbilt / Kenworth Cummins X15 DEF Sensor (OEM Q21-6170-003K1T)

What is it?
The Peterbilt / Kenworth Cummins X15 DEF Sensor (OEM Q21-6170-003K1T) is a Diesel Exhaust Fluid (DEF) quality and level sensor designed for PACCAR vehicles equipped with Cummins X15 engines. This sensor continuously monitors DEF concentration, temperature, and fluid level to ensure precise dosing for the Selective Catalytic Reduction (SCR) system—keeping emissions within compliance standards.

Why Choose the Peterbilt / Kenworth Cummins X15 DEF Sensor (OEM Q21-6170-003K1T)?
This OEM sensor is engineered to PACCAR’s factory specifications for perfect fitment and reliability. It communicates directly with the vehicle’s engine control module, ensuring accurate feedback on DEF quality and quantity. Using a genuine OEM sensor eliminates compatibility issues, reduces false error codes, and ensures smooth SCR system operation in heavy-duty applications.

Key Benefits
✅ OEM Fitment: Precisely matches factory design for Peterbilt and Kenworth trucks with Cummins X15 engines.
✅ Reliable Data Accuracy: Provides consistent measurements of DEF level, concentration, and temperature.
✅ Built for Harsh Environments: Resistant to heat, vibration, and exposure to corrosive DEF fluids.
✅ Fault Reduction: Prevents system malfunctions, false warnings, and unnecessary engine derates.
✅ Emission System Longevity: Supports optimal DEF dosing, protecting SCR catalysts and related components.

Applications
The DEF Sensor (OEM Q21-6170-003K1T) is designed for Peterbilt and Kenworth trucks powered by Cummins X15 engines. It’s ideal for long-haul, fleet, and vocational operations where consistent emissions control and uptime are critical.

Installation Notes
Installation should be handled by a certified technician. Before starting, verify the part number and ensure it matches your truck’s configuration. Disconnect electrical power, relieve pressure in the DEF system, and remove the old sensor carefully, noting wiring and orientation. Clean the mounting surface, inspect seals, and install the new sensor with proper torque settings. Reconnect wiring and clear any fault codes. After installation, test system performance to confirm accurate DEF readings and SCR communication.

Final Thoughts
The Peterbilt / Kenworth Cummins X15 DEF Sensor (OEM Q21-6170-003K1T) delivers factory-grade precision and reliability for modern heavy-duty emission systems. It ensures optimal DEF monitoring, reduces downtime from emission faults, and keeps your truck compliant, efficient, and ready for the road.