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DEF QUALITY SENSOR

The DEF (Diesel Exhaust Fluid) sensor plays a crucial role in the Selective Catalytic Reduction (SCR) system of heavy-duty trucks. It measures the level and quality of DEF in the storage tank and communicates this information to the engine control unit.

Customers should choose Advanced Truck Parts for their DEF sensor needs due to our commitment to quality and customer satisfaction. We offer a wide range of genuine DEF sensors for various heavy-duty truck makes and models, ensuring high-quality and reliable performance. Our experienced team provides expert guidance and support in selecting the right DEF sensor and addressing any technical inquiries. Moreover, we offer competitive pricing without compromising on quality, providing cost-effective solutions. With our comprehensive inventory, exceptional customer service, and dedication to delivering reliable DEF sensors, Advanced Truck Parts is the trusted choice for customers seeking accurate DEF level monitoring and optimal SCR system performance in their heavy-duty trucks.

  • 90035845 Genuine Kalmar Ottawa Multipurpose Head Unit Def Quality Sensor - ADVANCED TRUCK PARTS
    90035845 Genuine Kalmar Ottawa Multipurpose Head Unit Def Quality Sensor - ADVANCED TRUCK PARTS

    90035845 Genuine Kalmar Ottawa Multipurpose Head Unit Def Quality Sensor

    OTTAWA KALMAR
    $3,245.00
    $3,245.00 - $3,245.00
    $3,245.00
    $1,699.00
    $1,699.00 - $1,699.00
    $1,699.00
    Low stock

    Description: DEF quality sensor, multipurpose head unitCondition: NewBrand: Kalmar OttawaPart Number: 90035845Other Part Numbers That Will Work: OW...

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    $3,245.00
    $3,245.00 - $3,245.00
    $3,245.00
    $1,699.00
    $1,699.00 - $1,699.00
    $1,699.00
  • Q21-6167-001K1T Genuine Paccar Def Quality Sensor - ADVANCED TRUCK PARTS
    Q21-6167-001K1T Genuine Paccar Def Quality Sensor - ADVANCED TRUCK PARTS

    Q21-6167-001K1T Genuine Paccar Def Quality Sensor

    PACCAR
    $575.00
    $575.00 - $575.00
    $575.00
    $250.00
    $250.00 - $250.00
    $250.00
    Low stock

    Description: DEF Quality Sensor For Peterbilt Kenworth Paccar Condition: New Brand: Paccar Part Number: Q21-6167-001K1T Other OEM Part Numbers That...

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    $575.00
    $575.00 - $575.00
    $575.00
    $250.00
    $250.00 - $250.00
    $250.00
  • 4163699C91 Genuine International Qls Fls Def Sensor Gal 15.5 16 23 - ADVANCED TRUCK PARTS

    4163699C91 Genuine International Qls Fls Def Sensor Gal 15.5 16 23

    INTERNATIONAL
    $1,599.00 - $1,599.00
    $1,599.00
    $1,599.00 - $1,599.00
    $1,599.00
    Low stock

    Description: Qls Fls Def Sensor Gal 15.5, 16, 23Condition: NewBrand: International Part Number: 4163699C91

    $1,599.00 - $1,599.00
    $1,599.00
    $1,599.00 - $1,599.00
    $1,599.00

  • Q21-6127-006k1t Genuine Paccar® Def Quality Sensor

    PACCAR
    $985.00
    $985.00 - $985.00
    $985.00
    $299.00
    $299.00 - $299.00
    $299.00
    Low stock

    Description: Def Quality ( Free Over Night Shipping )Condition: New Brand: PaccarPart Number Q21-6127-006k1t Other Oem Part Numbers That Will Work:...

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    $985.00
    $985.00 - $985.00
    $985.00
    $299.00
    $299.00 - $299.00
    $299.00
  • 4097725C91 Genuine International® Def Tank Qls Ssi Sensor For Navistar - ADVANCED TRUCK PARTS
    4097725C91 Genuine International® Def Tank Qls Ssi Sensor For Navistar - ADVANCED TRUCK PARTS

    4097725C91 Genuine International® Def Tank Qls Ssi Sensor For Navistar

    INTERNATIONAL
    $899.00 - $899.00
    $899.00
    $899.00 - $899.00
    $899.00
    Low stock

    Description: Def Tank Qls Ssi Sensor For Navistar Condition: New Brand: International Part Number: 4097725C91  Navistar®

    $899.00 - $899.00
    $899.00
    $899.00 - $899.00
    $899.00
  • 4097728C91 Genuine International® Def Sensor 10.6 15.9 For Navistar - ADVANCED TRUCK PARTS
    4097728C91 Genuine International® Def Sensor 10.6 15.9 For Navistar - ADVANCED TRUCK PARTS

    4097728C91 Genuine International® Def Sensor 10.6 15.9 For Navistar

    INTERNATIONAL
    $639.00 - $639.00
    $639.00
    $639.00 - $639.00
    $639.00
    Low stock

    Description: Def Sensor 10.6/15.9/25.2g, For Navistar Condition: New Brand: InternationalPart Number: 4097728C91

    $639.00 - $639.00
    $639.00
    $639.00 - $639.00
    $639.00
  • 4097727C91 Genuine International® Def Tank Sensor For Navistar - ADVANCED TRUCK PARTS
    4097727C91 Genuine International® Def Tank Sensor For Navistar - ADVANCED TRUCK PARTS

    4097727C91 Genuine International® Def Tank Sensor For Navistar

    INTERNATIONAL
    $899.00
    $899.00 - $899.00
    $899.00
    $399.00
    $399.00 - $399.00
    $399.00
    Low stock

    Description: Def Tank Sensor For NavistarCondition: NewBrand: InternationalPart Number: 4097727C91 Navistar®

    $899.00
    $899.00 - $899.00
    $899.00
    $399.00
    $399.00 - $399.00
    $399.00
  • 23539923 Genuine Mack Def Level Sensor - ADVANCED TRUCK PARTS
    23539923 Genuine Mack Def Level Sensor - ADVANCED TRUCK PARTS
    Sold out

    23539923 Genuine Mack Def Level Sensor

    MACK
    $499.00 - $499.00
    $499.00
    $499.00 - $499.00
    $499.00
    Out of stock

    Description: DEF Level Sensor (No Core Charge)Condition: NewBrand: Mack Part Number: 23539923Other OEM Part Numbers That Will Work: 22306793, 23045...

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    $499.00 - $499.00
    $499.00
    $499.00 - $499.00
    $499.00
    Sold out
  • 4157846C91 Genuine Navistar International Def Tank Qls Sensor Head Unit - ADVANCED TRUCK PARTS
    4157846C91 Genuine Navistar International Def Tank Qls Sensor Head Unit - ADVANCED TRUCK PARTS

    4157846C91 Genuine Navistar International Def Tank Qls Sensor Head Unit

    INTERNATIONAL
    $1,699.00
    $1,699.00 - $1,699.00
    $1,699.00
    $699.00
    $699.00 - $699.00
    $699.00
    Low stock

    Description: 7 Gallon DEF Tank QLS 1% SSI Sensor Head Unit Condition: New Brand: Navistar International Part Number: 4157846C91 Navistar®

    $1,699.00
    $1,699.00 - $1,699.00
    $1,699.00
    $699.00
    $699.00 - $699.00
    $699.00
  • 2515990C3 Genuine International® Def Quality Sensor For Navistar - ADVANCED TRUCK PARTS
    2515990C3 Genuine International® Def Quality Sensor For Navistar - ADVANCED TRUCK PARTS
    Sold out

    2515990C3 Genuine International® Def Quality Sensor For Navistar

    INTERNATIONAL
    $699.00 - $699.00
    $699.00
    $699.00 - $699.00
    $699.00
    Out of stock

    Description: Def Quality Sensor For Navistar    Condition: New Brand: International Part Number: 2515990c3Navistar®

    $699.00 - $699.00
    $699.00
    $699.00 - $699.00
    $699.00
    Sold out
  • 4097722C91 Genuine Navistar International 7 Gallon Def Tank Qls 1% Ssi Sensor Head Unit - ADVANCED TRUCK PARTS
    4097722C91 Genuine Navistar International 7 Gallon Def Tank Qls 1% Ssi Sensor Head Unit - ADVANCED TRUCK PARTS

    4097722C91 Genuine Navistar International 7 Gallon Def Tank Qls 1% Ssi Sensor Head Unit

    INTERNATIONAL
    $1,699.00
    $1,699.00 - $1,699.00
    $1,699.00
    $699.00
    $699.00 - $699.00
    $699.00
    Low stock

    Description: 7 Gallon Def Tank Qls 1% Ssi Sensor Head UnitCondition: NewPart Number: 4097722C91Brand: Navistar InternationalNavistar®

    $1,699.00
    $1,699.00 - $1,699.00
    $1,699.00
    $699.00
    $699.00 - $699.00
    $699.00
  • 4163695C91 Genuine Navistar International® 15 Gallon Def Tank Qls 1% Ssi Sensor Head Unit - ADVANCED TRUCK PARTS

    4163695C91 Genuine Navistar International® 15 Gallon Def Tank Qls 1% Ssi Sensor Head Unit

    INTERNATIONAL
    $899.00
    $899.00 - $899.00
    $899.00
    $399.00
    $399.00 - $399.00
    $399.00
    Low stock

    Description: 15 Gallon DEF Tank QLS 1% SSI Sensor Head Unit Condition: New Brand: Navistar International Part Number: 4163695C91 Navistar®

    $899.00
    $899.00 - $899.00
    $899.00
    $399.00
    $399.00 - $399.00
    $399.00
  • Q21-6167-002K1T Q21-6170-002K1T Remanufactured Oem Paccar Def Quality Sensor - ADVANCED TRUCK PARTS

    Q21-6167-002K1T Q21-6170-002K1T Remanufactured Oem Paccar Def Quality Sensor

    PACCAR
    $999.00
    $999.00 - $999.00
    $999.00
    $399.00
    $399.00 - $399.00
    $399.00
    Low stock

    Description: Def Quality Sensor For Peterbilt Kenworth Paccar Condition: Remanufactured Brand: Paccar Part Number: Q21-6170-002k1t Other Oem Part N...

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    $999.00
    $999.00 - $999.00
    $999.00
    $399.00
    $399.00 - $399.00
    $399.00
  • Q21-6167-002K1T Q21-6170-002K1T Oem Paccar® New Def Quality Sensor - ADVANCED TRUCK PARTS
    Q21-6167-002K1T Q21-6170-002K1T Oem Paccar® New Def Quality Sensor - ADVANCED TRUCK PARTS

    Q21-6170-002K1T Oem Paccar® New Def Quality Sensor

    PACCAR
    $999.00
    $999.00 - $999.00
    $999.00
    $399.00
    $399.00 - $399.00
    $399.00
    Low stock

    Description: Def Quality Sensor For Peterbilt Kenworth PaccarCondition: NewBrand: PaccarPart Number: Q21-6170-002k1t, Q21-6127-002K1T Other Oem Par...

    View full details
    $999.00
    $999.00 - $999.00
    $999.00
    $399.00
    $399.00 - $399.00
    $399.00
  • 4140918C91 Genuine Navistar International 10.6/15.9/25 Gallon Def Tank Qls Sensor Head Unit - ADVANCED TRUCK PARTS
    4140918C91 Genuine Navistar International 10.6/15.9/25 Gallon Def Tank Qls Sensor Head Unit - ADVANCED TRUCK PARTS

    4140918C91 Genuine Navistar International 10.6/15.9/25 Gallon Def Tank Qls Sensor Head Unit

    INTERNATIONAL
    $639.00 - $639.00
    $639.00
    $639.00 - $639.00
    $639.00
    Low stock

    Description: SENSOR, QLS, 25.2 GALLON DEF TANKCondition: NewPart Number: 4140918C91 Brand: Navistar InternationalNavistar®

    $639.00 - $639.00
    $639.00
    $639.00 - $639.00
    $639.00
  • 5012176R91 Genuine Navistar International 5 Gallon Def Tank Qls Sensor Head Unit - ADVANCED TRUCK PARTS

    5012176R91 Genuine Navistar International 5 Gallon Def Tank Qls Sensor Head Unit

    INTERNATIONAL
    $699.00 - $699.00
    $699.00
    $699.00 - $699.00
    $699.00
    Low stock

    Description: 5 Gallon Def Tank Qls Sensor Head Unit Condition: New Part Number: 5012176R91  Brand: Navistar InternationalNavistar®

    $699.00 - $699.00
    $699.00
    $699.00 - $699.00
    $699.00

  • Q21-6167-003K1T Paccar Def Quality Sensor

    PACCAR
    $985.00
    $985.00 - $985.00
    $985.00
    $299.00
    $299.00 - $299.00
    $299.00
    Low stock

    Description: Def Quality Sensor For Peterbilt Kenworth Paccar, Cleaned Inspected, Comes With New O-RingCondition: NewBrand: PaccarPart Number: Q21-...

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    $985.00
    $985.00 - $985.00
    $985.00
    $299.00
    $299.00 - $299.00
    $299.00
  • Dm601-1800F765 Genuine Spartan Motorhome Def Head Level Sensor For 10 Gallon - ADVANCED TRUCK PARTS
    Dm601-1800F765 Genuine Spartan Motorhome Def Head Level Sensor For 10 Gallon - ADVANCED TRUCK PARTS
    Sold out

    Dm601-1800F765 Genuine Spartan Motorhome Def Head Level Sensor For 10 Gallon

    SPARTAN
    $2,999.00
    $2,999.00 - $2,999.00
    $2,999.00
    $1,499.00
    $1,499.00 - $1,499.00
    $1,499.00
    Out of stock

    Description: Def Head Level Sensor For 10 Gallon Tank Condition: NewBrand: Spartan Part Number: DM601-1800F765

    $2,999.00
    $2,999.00 - $2,999.00
    $2,999.00
    $1,499.00
    $1,499.00 - $1,499.00
    $1,499.00
    Sold out
  • 2515899C1 Genuine International® Def Tank Level Sensor 5-Gal - ADVANCED TRUCK PARTS
    Sold out

    2515899C1 Genuine International® Def Tank Level Sensor 5-Gal

    INTERNATIONAL
    $2,449.00
    $2,449.00 - $2,449.00
    $2,449.00
    $1,299.00
    $1,299.00 - $1,299.00
    $1,299.00
    Out of stock

    Description: Def Tank Level Sensor 5-Gal   Condition: New  Brand: InternationalPart Number: 2515899C1  Other OEM Part Numbers That Will Work: 25166...

    View full details
    $2,449.00
    $2,449.00 - $2,449.00
    $2,449.00
    $1,299.00
    $1,299.00 - $1,299.00
    $1,299.00
    Sold out
  • 4254201C91 Genuine Navistar International 9.5 Gallon Def Tank Qls Sensor Head Unit - ADVANCED TRUCK PARTS
    4254201C91 Genuine Navistar International 9.5 Gallon Def Tank Qls Sensor Head Unit - ADVANCED TRUCK PARTS

    4254201C91 Genuine Navistar International 9.5 Gallon Def Tank Qls Sensor Head Unit

    INTERNATIONAL
    $1,299.00 - $1,299.00
    $1,299.00
    $1,299.00 - $1,299.00
    $1,299.00
    Low stock

    Description: Sensor, 9.5 Gallon, With Cover Condition: New Brand: Navistar International Part Number: 4254201C91  Navistar®

    $1,299.00 - $1,299.00
    $1,299.00
    $1,299.00 - $1,299.00
    $1,299.00
  • 5012173R91 Genuine International Quality Level Sensor Qls 12 Gal - ADVANCED TRUCK PARTS

    5012173R91 Genuine International Quality Level Sensor Qls 12 Gal

    INTERNATIONAL
    $699.00 - $699.00
    $699.00
    $699.00 - $699.00
    $699.00
    Low stock

    Description: Quality Level Sensor QLS 12 GalCondition: NewBrand: International Part Number: 5012173R91

    $699.00 - $699.00
    $699.00
    $699.00 - $699.00
    $699.00
  • 2515984C3 Genuine International® 9.5 Gal Def Sensor For Navistar - ADVANCED TRUCK PARTS
    2515984C3 Genuine International® 9.5 Gal Def Sensor For Navistar - ADVANCED TRUCK PARTS

    2515984C3 Genuine International® 9.5 Gal Def Sensor For Navistar

    INTERNATIONAL
    $999.00
    $999.00 - $999.00
    $999.00
    $699.00
    $699.00 - $699.00
    $699.00
    Low stock

    Description: 9.5 Gal Def Sensor For Navistar     Condition: New  Brand: International Part Number: 2515984C3 Navistar®

    $999.00
    $999.00 - $999.00
    $999.00
    $699.00
    $699.00 - $699.00
    $699.00
  • 23539939 Genuine Volvo Def Level Sensor For Adblue Tank 70 L - ADVANCED TRUCK PARTS
    23539939 Genuine Volvo Def Level Sensor For Adblue Tank 70 L - ADVANCED TRUCK PARTS
    Sold out

    23539939 Genuine Volvo Def Level Sensor For Adblue Tank 70 L

    VOLVO
    $858.96
    $858.96 - $858.96
    $858.96
    $685.00
    $685.00 - $685.00
    $685.00
    Out of stock

    Description: Def Level Sensor For Adblue Tank 70 LCondition: New Brand: VolvoPart Number: 23539939Other Oem Part Numbers That Will Work: 22432646, ...

    View full details
    $858.96
    $858.96 - $858.96
    $858.96
    $685.00
    $685.00 - $685.00
    $685.00
    Sold out
  • DC4Z5J250E Genuine Ford Def Tank Level Sensor 5-Gal - ADVANCED TRUCK PARTS
    Sold out

    DC4Z5J250E Genuine Ford Def Tank Level Sensor 5-Gal

    FORD
    $2,449.00
    $2,449.00 - $2,449.00
    $2,449.00
    $1,299.00
    $1,299.00 - $1,299.00
    $1,299.00
    Out of stock

    Description: Def Tank Level Sensor 5-Gal   Condition: New  Brand: FordPart Number: DC4Z5J250E  Other OEM Part Numbers That Will Work: 2515899C1, 25...

    View full details
    $2,449.00
    $2,449.00 - $2,449.00
    $2,449.00
    $1,299.00
    $1,299.00 - $1,299.00
    $1,299.00
    Sold out

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