Peterbuilt/ Kenworth Cummins X15 DEF Sensor

Precision DEF Quality Monitoring: Peterbilt / Kenworth Cummins X15 DEF Sensor (OEM Q21-6170-001K1T)

What is it?
The Peterbilt / Kenworth Cummins X15 DEF Sensor (OEM Q21-6170-001K1T) is a Diesel Exhaust Fluid (DEF) quality sensor designed for heavy-duty trucks using the Cummins X15 engine. This sensor monitors the DEF’s concentration, temperature, and quality to ensure proper operation of the Selective Catalytic Reduction (SCR) system. By providing accurate data to the engine control module, it helps maintain compliance with emissions regulations and prevents unnecessary derates or fault codes.

Why Choose the Peterbilt / Kenworth Cummins X15 DEF Sensor (OEM Q21-6170-001K1T)?
This DEF sensor is manufactured to OEM standards for PACCAR vehicles, ensuring a precise fit and reliable integration with factory wiring and SCR systems. Its calibration and output match the original specifications used by Peterbilt and Kenworth, guaranteeing proper communication with the vehicle’s emissions control module. Choosing an OEM-grade sensor ensures consistent DEF quality readings and minimizes operational issues associated with inaccurate fluid data.

Key Benefits
✅ OEM Fit and Compatibility: Direct replacement for the factory-installed DEF sensor used in Peterbilt and Kenworth trucks with Cummins X15 engines.
✅ Heavy-Duty Design: Built to withstand extreme heat, vibration, and DEF exposure found in long-haul and vocational operations.
✅ Accurate DEF Monitoring: Measures urea concentration, fluid temperature, and quality to ensure correct SCR function.
✅ Minimized Fault Codes: Helps prevent false warnings and emission system derates caused by inaccurate readings.
✅ Protects Emission Components: Maintains optimal SCR performance, safeguarding catalysts and sensors downstream.

Applications
The Peterbilt / Kenworth Cummins X15 DEF Sensor (OEM Q21-6170-001K1T) is compatible with heavy-duty trucks built under the PACCAR umbrella, including Peterbilt and Kenworth models equipped with Cummins X15 engines. It’s suitable for highway, fleet, and industrial operations that rely on consistent emission system performance and regulatory compliance.

Installation Notes
Professional installation is recommended. Before replacement, confirm that the sensor’s part number matches the original equipment. Disconnect electrical connections and DEF lines safely, then remove the old sensor while noting its orientation. Clean the area to remove crystallized DEF deposits before installing the new unit. Secure the sensor using manufacturer torque specifications, reconnect all wiring, and clear any existing diagnostic trouble codes. After installation, perform an emissions system check to verify proper communication with the ECM and stable DEF quality readings.

Final Thoughts
Maintaining accurate DEF system readings is essential to engine performance and emissions compliance. The Peterbilt / Kenworth Cummins X15 DEF Sensor (OEM Q21-6170-001K1T) provides OEM-level reliability and precision, ensuring your SCR system operates efficiently, avoids unnecessary downtime, and keeps your truck compliant and road-ready.