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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.

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  • 5012172R91 Genuine Navistar International 9.5 Gallon Def Tank Qls Sensor Head Unit - ADVANCED TRUCK PARTS

    5012172R91 Genuine Navistar International 9.5 Gallon Def Tank Qls Sensor Head Unit

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

    Description: SENSOR, 9.5 GALLON, QLS WITH COVER   Condition: NewBrand: Navistar InternationalPart Number: 5012172R91  Other OEM Part Numbers That W...

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

  • 4099715C91 Genuine Navistar International 7 Gallon Def Tank Qls 1% Ssi Sensor Head Unit

    $1,699.00
    $1,699.00 - $1,699.00
    $1,699.00
    $699.00
    $699.00 - $699.00
    $699.00

    Description: 7 Gallon Def Tank Qls 1% Ssi Sensor Head Unit Condition: NewPart Number: 4099715C91 Brand: Navistar International Other OEM Part Numbe...

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    $1,699.00
    $1,699.00 - $1,699.00
    $1,699.00
    $699.00
    $699.00 - $699.00
    $699.00

  • 2512842C1 Genuine Navistar International 7 Gallon Def Tank Qls 1% Ssi Sensor Head Unit

    $1,699.00
    $1,699.00 - $1,699.00
    $1,699.00
    $699.00
    $699.00 - $699.00
    $699.00

    Description: 7 Gallon Def Tank Qls 1% Ssi Sensor Head Unit Condition: NewPart Number: 2512842C1  Brand: Navistar International Other OEM Part Numbe...

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    $1,699.00
    $1,699.00 - $1,699.00
    $1,699.00
    $699.00
    $699.00 - $699.00
    $699.00
  • 2523589C91 Genuine Navistar International 7 Gallon Def Tank Qls 1% Ssi Sensor Head Unit - ADVANCED TRUCK PARTS

    2523589C91 Genuine Navistar International 7 Gallon Def Tank Qls 1% Ssi Sensor Head Unit

    $1,699.00
    $1,699.00 - $1,699.00
    $1,699.00
    $699.00
    $699.00 - $699.00
    $699.00

    Description: 7 Gallon Def Tank Qls 1% Ssi Sensor Head Unit Condition: NewPart Number: 2523589C91 Brand: Navistar International Other OEM Part Numbe...

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    $1,699.00
    $1,699.00 - $1,699.00
    $1,699.00
    $699.00
    $699.00 - $699.00
    $699.00
  • 2523591C91 Genuine International Def Sensor 10.6 15.9 For Navistar - ADVANCED TRUCK PARTS

    2523591C91 Genuine International Def Sensor 10.6 15.9 For Navistar

    $639.00 - $639.00
    $639.00
    $639.00 - $639.00
    $639.00

    Description: Def Sensor 10.6, 15.9 For Navistar Condition: New Part Number: 2523591C91  Brand: International  Other OEM Part Numbers That Will Work...

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    $639.00 - $639.00
    $639.00
    $639.00 - $639.00
    $639.00
  • 4157848C91 Genuine International 7 Gal Quality Level Sensor QLS 1 Assembly DEF Tank - ADVANCED TRUCK PARTS
    Sold out

    4157848C91 Genuine International 7 Gal Quality Level Sensor QLS 1 Assembly DEF Tank

    $2,357.00
    $2,357.00 - $2,357.00
    $2,357.00
    $1,999.00
    $1,999.00 - $1,999.00
    $1,999.00

    Description: 7 Gal Quality Level Sensor (QLS) 1 Assembly DEF TankCondition: NewBrand: InternationalPart Number: 4157848C91Other OEM Part Numbers Th...

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    $2,357.00
    $2,357.00 - $2,357.00
    $2,357.00
    $1,999.00
    $1,999.00 - $1,999.00
    $1,999.00
    Sold out
  • 22104122072 Genuine Peterbilt® Def Sensor Head Unit - ADVANCED TRUCK PARTS
    Sold out

    22104122072 Genuine Peterbilt Def Sensor Head Unit

    $1,149.00 - $1,149.00
    $1,149.00
    $1,149.00 - $1,149.00
    $1,149.00

    Description: DEF Lever Sensor Condition: New Brand: PeterbiltPart Number: 22104122072

    $1,149.00 - $1,149.00
    $1,149.00
    $1,149.00 - $1,149.00
    $1,149.00
    Sold out
  • 594-8691 Genuine Cat Def Sensor Manifold Kit - ADVANCED TRUCK PARTS

    594-8691 Genuine Cat Def Sensor Manifold Kit

    $1,949.00 - $1,949.00
    $1,949.00
    $1,949.00 - $1,949.00
    $1,949.00

    Description: DEF Sensor Manifold Kit Condition: NewBrand: Caterpillar Part Number: 594-8691Other OEM Part Numbers That Will Work: 600-5637, 6005637...

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    $1,949.00 - $1,949.00
    $1,949.00
    $1,949.00 - $1,949.00
    $1,949.00
  • 90035846 Genuine Ottawa® Def Level Sensor For 2018 T-2 Yardhorse - ADVANCED TRUCK PARTS

    90035846 Genuine Ottawa Def Level Sensor For 2018 T-2 Yardhorse

    $1,299.00 - $1,299.00
    $1,299.00
    $1,299.00 - $1,299.00
    $1,299.00

    Description: Def Level Sensor For 2018 T-2 | YardhorseCondition: NewBrand: OttawaPart Number: 90035846 Other Oem Part Numbers That Will Work: 90035...

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    $1,299.00 - $1,299.00
    $1,299.00
    $1,299.00 - $1,299.00
    $1,299.00
  • 4099718C91 Genuine Navistar International® Sensor Def Tank Level Head Unit Fls 1% 10.6/15.9/25.2 Gallon - ADVANCED TRUCK PARTS

    4099718C91 Genuine Navistar International Sensor Def Tank Level Head Unit Fls 1% 10.6/15.9/25.2 Gallon

    $1,299.00 - $1,299.00
    $1,299.00
    $1,299.00 - $1,299.00
    $1,299.00

    Description: Sensor, 10.6/15.9/25.2G, FLS SSI Condition: New Brand: Navistar International Part Number: 4099718C91 Other Oem Part Numbers That Will...

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    $1,299.00 - $1,299.00
    $1,299.00
    $1,299.00 - $1,299.00
    $1,299.00
  • 5012179R91 Genuine Navistar International 9.5 Gallon Def Tank Qls 1% Sensor Head Unit - ADVANCED TRUCK PARTS

    5012179R91 Genuine Navistar International 9.5 Gallon Def Tank Qls 1% Sensor Head Unit

    $1,899.00 - $1,899.00
    $1,899.00
    $1,899.00 - $1,899.00
    $1,899.00

    Description: HEAD UNIT, FLS 1%, DEF, 9.5 GALLONCondition: NewPart Number: 5012179R91Brand: Navistar International Other OEM Part Numbers That Will ...

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    $1,899.00 - $1,899.00
    $1,899.00
    $1,899.00 - $1,899.00
    $1,899.00
  • 4163698C91 Genuine Navistar International 9.5 Gallon Def Tank Qls 1% Sensor Head Unit - ADVANCED TRUCK PARTS

    4163698C91 Genuine Navistar International 9.5 Gallon Def Tank Qls 1% Sensor Head Unit

    $1,899.00 - $1,899.00
    $1,899.00
    $1,899.00 - $1,899.00
    $1,899.00

    Description: HEAD UNIT, FLS 1%, DEF, 9.5 GALLONCondition: NewPart Number: 4163698C91Brand: Navistar International Other OEM Part Numbers That Will ...

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    $1,899.00 - $1,899.00
    $1,899.00
    $1,899.00 - $1,899.00
    $1,899.00
  • 4091856C91 Genuine Navistar International 15.5/16/23 Gallon Def Tank Qls 1% Sensor Head Unit - ADVANCED TRUCK PARTS

    4091856C91 Genuine Navistar International 15.5/16/23 Gallon Def Tank Qls 1% Sensor Head Unit

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

    Description: SENSOR, 15.5/16/23 GALLON, FLS 1%Condition: NewPart Number: 4091856C91Brand: Navistar International Other OEM Part Numbers That Will W...

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    $1,599.00 - $1,599.00
    $1,599.00
    $1,599.00 - $1,599.00
    $1,599.00
  • 2510966C3 Genuine Navistar International 15.5/16/23 Gallon Def Tank Qls 1% Sensor Head Unit - ADVANCED TRUCK PARTS

    2510966C3 Genuine Navistar International 15.5/16/23 Gallon Def Tank Qls 1% Sensor Head Unit

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

    Description: 15.5/16/23 Gallon Def Tank Qls 1% Sensor Head UnitCondition: NewPart Number: 2510966C3Brand: Navistar International Other OEM Part Num...

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    $1,599.00 - $1,599.00
    $1,599.00
    $1,599.00 - $1,599.00
    $1,599.00
  • 5012180R91 Genuine Navistar International 15.5/16/23 Gallon Def Tank Qls 1% Sensor Head Unit - ADVANCED TRUCK PARTS

    5012180R91 Genuine Navistar International 15.5/16/23 Gallon Def Tank Qls 1% Sensor Head Unit

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

    Description:  15.5/16/23 Gallon Def Tank Qls 1% Sensor Head Unit Condition: NewPart Number: 5012180R91Brand: Navistar International Other OEM Part ...

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    $1,599.00 - $1,599.00
    $1,599.00
    $1,599.00 - $1,599.00
    $1,599.00
  • 4254202C91 Genuine Navistar International 15.5/16/23 Gallon Def Tank Qls Sensor Head Unit - ADVANCED TRUCK PARTS

    4254202C91 Genuine Navistar International 15.5/16/23 Gallon Def Tank Qls Sensor Head Unit

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

    Description: 15.5/16/23 Gallon Def Tank Qls  Sensor Head Unit Condition: NewPart Number: 4254202C91Brand: Navistar International Other OEM Part Num...

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    $1,599.00 - $1,599.00
    $1,599.00
    $1,599.00 - $1,599.00
    $1,599.00
  • 4254200C91 Genuine Navistar International 7 Gallon Def Tank Qls Sensor Head Unit - ADVANCED TRUCK PARTS

    4254200C91 Genuine Navistar International 7 Gallon Def Tank Qls Sensor Head Unit

    $1,699.00
    $1,699.00 - $1,699.00
    $1,699.00
    $699.00
    $699.00 - $699.00
    $699.00

    Description:  7 Gallon Def Tank Qls  Sensor Head Unit Condition: New Brand: Navistar International Part Number: 4254200C91 Other OEM Part Numbers T...

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    $1,699.00
    $1,699.00 - $1,699.00
    $1,699.00
    $699.00
    $699.00 - $699.00
    $699.00
  • 2510967C3 4254201C91 Genuine Navistar International® 9.5 Gallon Def Tank Qls Sensor Head Unit - ADVANCED TRUCK PARTS

    2510967C3 Genuine Navistar International 9.5 Gallon Def Tank Qls Sensor Head Unit

    $1,299.00 - $1,299.00
    $1,299.00
    $1,299.00 - $1,299.00
    $1,299.00

    Description: 9.5 Gallon DEF Tank QLS Sensor Head Unit Condition: NewBrand: International Part Number: 2510967C3Other Oem Part Numbers That Will Wor...

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    $1,299.00 - $1,299.00
    $1,299.00
    $1,299.00 - $1,299.00
    $1,299.00
  • 2517604C1 Genuine Navistar International 10.6/15.9/25 Gallon Def Tank Qls Sensor Head Unit - ADVANCED TRUCK PARTS

    2517604C1 Genuine Navistar International 10.6/15.9/25 Gallon Def Tank Qls Sensor Head Unit

    $639.00 - $639.00
    $639.00
    $639.00 - $639.00
    $639.00

    Description: SENSOR, QLS, 25.2 GALLON DEF TANKCondition: NewPart Number: 2517604C1Brand: Navistar International Other OEM Part Numbers That Will Wo...

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    $639.00 - $639.00
    $639.00
    $639.00 - $639.00
    $639.00
  • 2517604C91 Genuine Navistar International 10.6/15.9/25 Gallon Def Tank Qls Sensor Head Unit - ADVANCED TRUCK PARTS

    2517604C91 Genuine Navistar International 10.6/15.9/25 Gallon Def Tank Qls Sensor Head Unit

    $639.00 - $639.00
    $639.00
    $639.00 - $639.00
    $639.00

    Description: SENSOR, QLS, 25.2 GALLON DEF TANKCondition: NewBrand: Navistar InternationalPart Number: 2517604C91  Other OEM Part Numbers That Will ...

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    $639.00 - $639.00
    $639.00
    $639.00 - $639.00
    $639.00
  • 4086046C91 Genuine Navistar International 10.6/15.9/25 Gallon Def Tank Qls Sensor Head Unit - ADVANCED TRUCK PARTS

    4086046C91 Genuine Navistar International 10.6/15.9/25 Gallon Def Tank Qls Sensor Head Unit

    $639.00 - $639.00
    $639.00
    $639.00 - $639.00
    $639.00

    Description: SENSOR, QLS, 25.2 GALLON DEF TANKCondition: NewBrand: Navistar InternationalPart Number: 4086046C91 Other OEM Part Numbers That Will W...

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    $639.00 - $639.00
    $639.00
    $639.00 - $639.00
    $639.00
  • 2515986C3 Genuine Navistar International 15 Gallon Def Tank Qls 1% Ssi Sensor Head Unit - ADVANCED TRUCK PARTS

    2515986C3 Genuine Navistar International 15 Gallon Def Tank Qls 1% Ssi Sensor Head Unit

    $899.00
    $899.00 - $899.00
    $899.00
    $399.00
    $399.00 - $399.00
    $399.00

    Description: SENSOR, 15G, QLS 1% SSICondition: NewPart Number: 2515986C3 Brand: Navistar International Other OEM Part Numbers That Will Work: 70118...

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    $899.00
    $899.00 - $899.00
    $899.00
    $399.00
    $399.00 - $399.00
    $399.00
  • 2515986C2 Genuine Navistar International 15 Gallon Def Tank Qls 1% Ssi Sensor Head Unit - ADVANCED TRUCK PARTS

    2515986C2 Genuine Navistar International 15 Gallon Def Tank Qls 1% Ssi Sensor Head Unit

    $899.00
    $899.00 - $899.00
    $899.00
    $399.00
    $399.00 - $399.00
    $399.00

    Description: SENSOR, 15G, QLS 1% SSICondition: NewPart Number: 2515986C2Brand: Navistar International Other OEM Part Numbers That Will Work: 701187...

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    $899.00
    $899.00 - $899.00
    $899.00
    $399.00
    $399.00 - $399.00
    $399.00
  • 2515985C3 Genuine Navistar International 15 Gallon Def Tank Qls 1% Ssi Sensor Head Unit - ADVANCED TRUCK PARTS

    2515985C3 Genuine Navistar International 15 Gallon Def Tank Qls 1% Ssi Sensor Head Unit

    $899.00
    $899.00 - $899.00
    $899.00
    $399.00
    $399.00 - $399.00
    $399.00

    Description: SENSOR, 15G, QLS 1% SSICondition: NewPart Number: 2515985C3 Brand: Navistar International Other OEM Part Numbers That Will Work: 70118...

    View full details
    $899.00
    $899.00 - $899.00
    $899.00
    $399.00
    $399.00 - $399.00
    $399.00

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