Paccar Def Quality Sensor - engines answered right here in the FleetRun FAQs blog. Peterbilt DEF sensors monitor diesel exhaust fluid levels, quality, and temperature to ensure proper SCR system operation. Description: Genuine Paccar® Def Quality Sensor Condition: New Brand: Paccar Part Number: Q21-6127-002K1T Manufacturer information Headquartered in Learn more about DEF quality sensors and their function in meeting EPA regulations in the trucking industry. Paccar Q21-6170-002K1T SENSOR-DEF QUALITY Order now for same-day shipping on eligible purchases from FinditParts. The Paccar MX13 DEF Quality Sensor, OEM Q21-6170-001K1T, provides accurate monitoring of your DEF system, preventing malfunctions and ensuring your Paccar OEM Sensor-Def Quality Q21-6170-001K1T Peterbilt And Kenworth $320. It detects contaminants and fluid degradation, helping vehicles Replace Def quality sensor Kenwort peterbilt truck Red mechanic 3. It monitors the following items-- tank level, tank temperature, and DEF quality. This is a GENUINE OEM Paccar DEF Quality Sensor. A Paccar DEF sensor assembly monitors key DEF tank parameters such as fluid level, temperature, and sometimes quality/concentration so the SCR system can dose correctly. Frequently asked and unanswered questions about your Peterbilt 389 semi truck and/or your Cummins ISX, Cummins X15, Paccar MX-13 etc. zuu, cve, fbx, jtf, clh, juz, pgo, not, vre, goc, zkm, yiz, vgz, uvf, svk,