ATP Q21-6170-001K1T DEF Level and Quality Sensor for Paccar 22"

ATP Q21-6170-001K1T DEF Level and Quality Sensor for Paccar 22"

Restore exact SCR system readings and prevent costly engine derates with this premium Advance Truck Parts (ATP) heavy-duty Diesel Exhaust Fluid (DEF) Level and Concentration Sensor. Built to provide an exact factory fit for 22-inch tank applications, this high-precision assembly monitors fluid levels, temperature, and urea purity in real time. 

Failing DEF sensors frequently trigger false dash faults and restrictive limp-mode countdowns. This direct-replacement unit features upgraded internal safeguards to resist crystallization and thermal breakdown, keeping your commercial fleet running clean and compliant.

Key Features

• Direct 22" Factory Fit: Specially calibrated for heavy-duty Paccar emissions setups requiring a 22-inch sensor assembly.

• Dual-Signal Precision: Accurately tracks both fluid volume and concentration levels to satisfy stringent EPA regulations.

• Corrosion-Resistant Housing: Upgraded seals and chemical-resistant components offer maximum defense against corrosive diesel exhaust fluid environments.

Technical Specifications

Vehicle & Engine Compatibility

• Truck Models: Fits heavy-duty Kenworth and Peterbilt Class 8 commercial semi-trucks.

• Engine Families: Compatible with 2013–2018 Paccar MX13 and select Cummins aftertreatment configurations.

Cross-Reference Interchanges

Directly replaces and interchanges with the following OEM and manufacturer numbers:

• Q21-6170-001K1T / Q216170001K1T

• Q21-6167-001 / Q21-6167-001K1T

• Q21-6127-001 / Q21-6127-001K1T

• Q216170001 / Q216167001 / Q216127001 

Fast Shipping & Local Pickup

Keeping your business moving is time-sensitive. We process
and ship orders quickly to keep your downtime to a minimum.

Same-Day Shipping Cutoffs

• Monday – Friday: Order by 5:30 PM ET
• Saturday: Order by 11:30 AM ET

Free Local Pickup

• Location: Sunrise, Florida
• Ready Time: Free 1-hour warehouse pickup for in-stock items.

Overnight & Weekend Delivery

• Standard Overnight: Delivered on the next business day (Monday – Friday).
• Friday Overnight Orders: Delivered on Monday by default.
• Saturday Delivery: If you need your order delivered on Saturday, you must select a specific "Saturday Delivery" option at checkout (subject to carrier availability).

Live Shipping Rates: Our website provides live shipping rates. Simply add the item to your cart and enter your ZIP code to instantly view all available shipping options before completing your purchase.

Next-Business-Day Delivery: Next-business-day delivery is available on many items when an overnight shipping option is selected before our daily shipping cutoff. Saturday delivery must be selected separately when available.