Peterbuilt/ Kenworth Paccar PX7, PX9, MX13 DEF Sensor

Precision DEF Monitoring: Peterbilt / Kenworth PACCAR PX7, PX9, MX13 DEF Sensor (OEM Q21-6170-002K1T)

What is it?
The OEM Q21-6170-002K1T is a Diesel Exhaust Fluid (DEF) quality and level sensor designed for Peterbilt and Kenworth trucks equipped with PACCAR PX7, PX9, or MX13 engines. This sensor accurately measures DEF level, temperature, and concentration to provide essential data to the Selective Catalytic Reduction (SCR) system, ensuring efficient emission control and compliance with regulations.

Why Choose the Peterbilt / Kenworth DEF Sensor (OEM Q21-6170-002K1T)?
This sensor is manufactured to PACCAR’s OEM standards, ensuring full compatibility with the truck’s factory systems. Its electrical connectors, calibration profile, and mounting geometry are built to exact specifications for a direct replacement fit. Using a genuine OEM sensor helps eliminate false readings, prevents emission-related fault codes, and ensures reliable SCR operation over time.

Key Benefits
✅ OEM-Level Fitment: Direct replacement for the original sensor, ensuring correct installation and communication with the ECU.
✅ Accurate DEF Measurement: Monitors DEF concentration, temperature, and level for precise dosing control.
✅ Durable Construction: Engineered to resist vibration, chemical corrosion, and temperature fluctuations in heavy-duty environments.
✅ Reduced Fault Codes: Prevents common DEF system issues like derates and false warnings.
✅ Extended System Reliability: Maintains proper SCR performance, protecting downstream catalysts and sensors.

Applications
The DEF Sensor (OEM Q21-6170-002K1T) is compatible with Peterbilt and Kenworth trucks running PACCAR PX7, PX9, and MX13 engines manufactured between 2015 and 2022. It’s ideal for fleet operations, regional-haul, and vocational applications where accurate DEF management and emission system dependability are essential.

Installation Notes
Before installation, verify that the part number matches your current DEF sensor. Disconnect electrical power and safely depressurize the DEF system. Remove the old sensor, noting the orientation and wiring connections. Clean the mounting surface to remove any DEF crystallization or debris. Install the new sensor using factory torque specifications, reconnect the wiring, and clear any existing diagnostic codes. After installation, perform a system check to confirm stable readings and SCR communication.

Final Thoughts
The Peterbilt / Kenworth PACCAR PX7, PX9, MX13 DEF Sensor (OEM Q21-6170-002K1T) ensures consistent DEF monitoring and accurate emissions control. Its OEM-grade quality provides lasting reliability, reduces downtime caused by system errors, and keeps your truck compliant and road-ready.