Peterbuilt/ Kenworth Paccar PX7, PX9, MX13 DPF Sensor

Accurate After-Treatment Monitoring: Peterbilt / Kenworth DEF Sensor (OEM Q21-6170-001KIT) for PX7, PX9, MX13

What is it?
The OEM Q21-6170-001KIT is a Diesel Exhaust Fluid (DEF) quality and level sensor kit designed for Peterbilt and Kenworth trucks equipped with PACCAR PX7, PX9, and MX13 engines. This component measures DEF concentration, temperature, and level to ensure precise communication with the Selective Catalytic Reduction (SCR) system. By providing accurate data, it helps the emissions system maintain efficiency and compliance with regulatory standards.

Why Choose the Peterbilt / Kenworth DEF Sensor (OEM Q21-6170-001KIT)?
This sensor kit is built to PACCAR’s exact OEM standards, ensuring a direct fit with the truck’s emissions system. Its calibration, electrical interface, and mechanical fit are all designed for compatibility with factory specifications. Using an OEM-grade sensor prevents false fault codes, inaccurate readings, and system derates that can arise from non-spec parts.

Key Benefits
✅ OEM Accuracy: Matches factory design and connector layout for a smooth installation and consistent data reporting.
✅ Reliable DEF Monitoring: Accurately tracks DEF level, temperature, and quality for proper SCR system function.
✅ Minimized Fault Codes: Reduces the risk of system errors related to DEF misreads or signal inconsistencies.
✅ Built for Heavy-Duty Environments: Durable materials withstand vibration, temperature swings, and chemical exposure.
✅ Prolonged System Life: Supports correct DEF dosing, which protects catalysts, DPFs, and downstream sensors.

Applications
The DEF Sensor (OEM Q21-6170-001KIT) is designed for use in Peterbilt and Kenworth trucks powered by PACCAR PX7, PX9, and MX13 engines from model years 2015–2022. It’s ideal for highway, regional-haul, and fleet operations that require dependable DEF monitoring and emissions system reliability.

Installation Notes
Before starting installation, verify the part number matches your truck’s existing sensor. Disconnect power and safely depressurize the DEF system. Remove the old sensor assembly while noting connector orientation and mounting details. Clean the installation surface to remove any DEF crystal buildup or debris. Install the new sensor kit using proper torque specifications, reconnect electrical and fluid lines, and clear any diagnostic fault codes. After installation, run a system check to confirm proper readings and stable SCR operation.

Final Thoughts
The Peterbilt / Kenworth DEF Sensor (OEM Q21-6170-001KIT) provides factory-grade precision and reliability. With accurate DEF monitoring and seamless integration, it helps maintain emissions compliance, prevent unnecessary downtime, and ensure consistent performance for your PACCAR PX7, PX9, or MX13-powered truck.