{"title":"Caterpillar DEF Sensors","description":"\u003cp\u003eCaterpillar DEF sensors monitor diesel exhaust fluid (DEF) levels, quality, and temperature within the aftertreatment system to ensure proper SCR operation. Accurate sensor data is critical for emissions compliance and preventing engine derates. At Advanced Truck Parts, we supply Caterpillar DEF sensors designed for reliable performance in diesel engines and equipment.\u003c\/p\u003e\n\n\u003cdetails\u003e\n\u003csummary\u003eClick to view more\u003c\/summary\u003e\n\n\u003cbr\u003e\n\n\u003ch2\u003eCaterpillar DEF Sensors in Aftertreatment Systems\u003c\/h2\u003e\n\u003cp\u003eDEF sensors are part of the Selective Catalytic Reduction (SCR) system. They monitor key DEF parameters and provide real-time data to the ECM, allowing precise control of DEF dosing and emissions reduction.\u003c\/p\u003e\n\n\u003cp\u003eCaterpillar DEF sensors typically monitor:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eDEF fluid level in the tank\u003c\/li\u003e\n\u003cli\u003eDEF temperature\u003c\/li\u003e\n\u003cli\u003eDEF quality (concentration of urea)\u003c\/li\u003e\n\u003cli\u003eSystem pressure (in certain configurations)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThis data ensures that the SCR system operates correctly and maintains proper NOx reduction efficiency under all operating conditions.\u003c\/p\u003e\n\n\u003cbr\u003e\n\n\u003ch2\u003eHow DEF Sensors Affect Engine Operation\u003c\/h2\u003e\n\u003cp\u003eModern Caterpillar engines rely heavily on DEF sensor feedback to maintain emissions compliance. If incorrect readings are detected, the ECM may limit engine performance to prevent emissions violations.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eControls DEF dosing rate into the exhaust system\u003c\/li\u003e\n\u003cli\u003ePrevents operation with poor-quality or diluted DEF\u003c\/li\u003e\n\u003cli\u003eTriggers warnings or derates when issues are detected\u003c\/li\u003e\n\u003cli\u003eSupports proper SCR catalyst efficiency\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eEven minor sensor faults can lead to major performance restrictions, making accurate sensor operation critical.\u003c\/p\u003e\n\n\u003cbr\u003e\n\n\u003ch2\u003eCommon Caterpillar Engine Applications\u003c\/h2\u003e\n\n\u003cp\u003eCaterpillar DEF sensors are used in diesel engines equipped with SCR aftertreatment systems across various applications.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eCaterpillar C7 diesel engines (late emissions models)\u003c\/li\u003e\n\u003cli\u003eCaterpillar C9 diesel engines\u003c\/li\u003e\n\u003cli\u003eCaterpillar C13, C15, and C18 engines\u003c\/li\u003e\n\u003cli\u003eCaterpillar construction and industrial equipment\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eSensor types and configurations vary depending on emissions tier and system design, so correct identification is essential.\u003c\/p\u003e\n\n\u003cbr\u003e\n\n\u003ch2\u003eCommon DEF Sensor Failure Symptoms\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eCheck engine or SCR system warning lights\u003c\/li\u003e\n\u003cli\u003eDEF quality or level fault codes\u003c\/li\u003e\n\u003cli\u003eEngine derate conditions\u003c\/li\u003e\n\u003cli\u003eIncorrect DEF level readings\u003c\/li\u003e\n\u003cli\u003eSCR efficiency or NOx-related faults\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eDEF sensor failures may occur due to contamination, crystallization buildup, electrical faults, or internal sensor degradation.\u003c\/p\u003e\n\n\u003cbr\u003e\n\n\u003ch2\u003eInstallation \u0026amp; System Considerations\u003c\/h2\u003e\n\n\u003cp\u003eWhen replacing a DEF sensor, it’s important to inspect the entire DEF system to avoid repeat issues.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eCheck DEF tank for contamination or debris\u003c\/li\u003e\n\u003cli\u003eInspect DEF lines and dosing injector for crystallization\u003c\/li\u003e\n\u003cli\u003eVerify wiring harness and connectors\u003c\/li\u003e\n\u003cli\u003eEnsure proper DEF fluid quality (ISO 22241 standard)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eProper system maintenance helps extend sensor life and maintain SCR performance.\u003c\/p\u003e\n\n\u003cbr\u003e\n\n\u003ch2\u003eVerify Fitment Before You Buy\u003c\/h2\u003e\n\n\u003cp\u003eDEF sensors are specific to engine model, emissions tier, and system configuration. To confirm compatibility before ordering, provide:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eEngine serial number\u003c\/li\u003e\n\u003cli\u003eEquipment or vehicle model\u003c\/li\u003e\n\u003cli\u003eCurrent DEF sensor part number\u003c\/li\u003e\n\u003cli\u003eSensor type (level, quality, temperature)\u003c\/li\u003e\n\u003cli\u003ePhotos of the sensor and connector if available\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThis ensures the correct Caterpillar DEF sensor is selected for your application.\u003c\/p\u003e\n\n\u003cbr\u003e\n\n\u003ch2\u003eWhy Buy Caterpillar DEF Sensors from Advanced Truck Parts?\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eFitment verification before purchase\u003c\/li\u003e\n\u003cli\u003eReliable emissions system components\u003c\/li\u003e\n\u003cli\u003eFast shipping to minimize equipment downtime\u003c\/li\u003e\n\u003cli\u003eSupport for fleets and repair technicians\u003c\/li\u003e\n\u003cli\u003eCompetitive pricing on aftertreatment parts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003c\/details\u003e","products":[{"product_id":"594-8690-genuine-caterpillar-def-sensor-kit","title":"594-8690 Genuine Caterpillar DEF Sensor Kit","description":"\u003cdiv class=\"product-description\"\u003e\n\n  \u003ch2\u003e594-8690 Genuine Caterpillar DEF Sensor Kit\u003c\/h2\u003e\n  \u003cp\u003e\n    This def sensor kit from CATERPILLAR is designed to deliver reliable performance and durability.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eKey Features\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eDesigned to match or exceed applicable specifications\u003c\/li\u003e\n    \u003cli\u003eProvides the function required for the intended system or assembly\u003c\/li\u003e\n    \u003cli\u003eBuilt for dependable performance and service life\u003c\/li\u003e\n    \u003cli\u003eBacked by CATERPILLAR quality and engineering.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eSpecifications\u003c\/h3\u003e\n  \u003ctable border=\"1\" cellspacing=\"0\" cellpadding=\"6\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eCATERPILLAR\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003ePart Type\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eDEF Sensor Kit\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e594-8690\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eOEM Cross Reference\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e616-5729, 6165729\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eUPC\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e706043AT\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e15.0 lb\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eBrand Information\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e CATERPILLAR\u003c\/p\u003e\n  \u003cp\u003e\n    Caterpillar is a global manufacturer of engines and heavy equipment, with components designed for rugged, high-demand environments.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eVerify part number, specifications, and application before installation.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n\u003c\/div\u003e","brand":"CAT","offers":[{"title":"Default Title","offer_id":44519119913189,"sku":"594-8690","price":599.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0315\/4437\/7480\/files\/594-8690-genuine-caterpillar-def-sensor-kit-advanced-truck-parts-24702.jpg?v=1755161244"},{"product_id":"5948690-genuine-caterpillar-def-sensor-kit","title":"5948690 Genuine Caterpillar DEF Sensor Kit","description":"\u003cdiv class=\"product-description\"\u003e\n\n  \u003ch2\u003e5948690 Genuine Caterpillar DEF Sensor Kit\u003c\/h2\u003e\n  \u003cp\u003e\n    This def sensor kit from CATERPILLAR is designed to deliver reliable performance and durability.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eKey Features\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eDesigned to match or exceed applicable specifications\u003c\/li\u003e\n    \u003cli\u003eProvides the function required for the intended system or assembly\u003c\/li\u003e\n    \u003cli\u003eBuilt for dependable performance and service life\u003c\/li\u003e\n    \u003cli\u003eBacked by CATERPILLAR quality and engineering.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eSpecifications\u003c\/h3\u003e\n  \u003ctable border=\"1\" cellspacing=\"0\" cellpadding=\"6\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eCATERPILLAR\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003ePart Type\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eDEF Sensor Kit\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e5948690\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eOEM Cross Reference\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e616-5729, 6165729\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eUPC\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e706043AT\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e15.0 lb\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eBrand Information\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e CATERPILLAR\u003c\/p\u003e\n  \u003cp\u003e\n    Caterpillar is a global manufacturer of engines and heavy equipment, with components designed for rugged, high-demand environments.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eVerify part number, specifications, and application before installation.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n\u003c\/div\u003e","brand":"CAT","offers":[{"title":"Default Title","offer_id":47630118387941,"sku":"5948690","price":599.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0315\/4437\/7480\/files\/594-8690-genuine-caterpillar-def-sensor-kit-advanced-truck-parts-24702.jpg?v=1755161244"},{"product_id":"616-5729-genuine-caterpillar-def-sensor-kit","title":"616-5729 Genuine Caterpillar DEF Sensor Kit","description":"\u003cdiv class=\"product-description\"\u003e\n\n  \u003ch2\u003e616-5729 Genuine Caterpillar DEF Sensor Kit\u003c\/h2\u003e\n  \u003cp\u003e\n    This def sensor kit from CATERPILLAR is designed to deliver reliable performance and durability.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eKey Features\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eDesigned to match or exceed applicable specifications\u003c\/li\u003e\n    \u003cli\u003eProvides the function required for the intended system or assembly\u003c\/li\u003e\n    \u003cli\u003eBuilt for dependable performance and service life\u003c\/li\u003e\n    \u003cli\u003eBacked by CATERPILLAR quality and engineering.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eSpecifications\u003c\/h3\u003e\n  \u003ctable border=\"1\" cellspacing=\"0\" cellpadding=\"6\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eCATERPILLAR\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003ePart Type\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eDEF Sensor Kit\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e616-5729\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eOEM Cross Reference\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e5948690\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eUPC\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e706043AT\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e15.0 lb\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eBrand Information\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e CATERPILLAR\u003c\/p\u003e\n  \u003cp\u003e\n    Caterpillar is a global manufacturer of engines and heavy equipment, with components designed for rugged, high-demand environments.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eVerify part number, specifications, and application before installation.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n\u003c\/div\u003e","brand":"CAT","offers":[{"title":"Default Title","offer_id":47630118486245,"sku":"616-5729","price":599.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0315\/4437\/7480\/files\/594-8690-genuine-caterpillar-def-sensor-kit-advanced-truck-parts-24702.jpg?v=1755161244"},{"product_id":"6165729-genuine-caterpillar-def-sensor-kit","title":"6165729 Genuine Caterpillar DEF Sensor Kit","description":"\u003cdiv class=\"product-description\"\u003e\n\n  \u003ch2\u003e6165729 Genuine Caterpillar DEF Sensor Kit\u003c\/h2\u003e\n  \u003cp\u003e\n    This def sensor kit from CATERPILLAR is designed to deliver reliable performance and durability.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eKey Features\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eDesigned to match or exceed applicable specifications\u003c\/li\u003e\n    \u003cli\u003eProvides the function required for the intended system or assembly\u003c\/li\u003e\n    \u003cli\u003eBuilt for dependable performance and service life\u003c\/li\u003e\n    \u003cli\u003eBacked by CATERPILLAR quality and engineering.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eSpecifications\u003c\/h3\u003e\n  \u003ctable border=\"1\" cellspacing=\"0\" cellpadding=\"6\"\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eCATERPILLAR\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003ePart Type\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003eDEF Sensor Kit\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eSKU\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e6165729\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eOEM Cross Reference\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e5948690\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eUPC\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e706043AT\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n        \u003ctd\u003e15.0 lb\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n  \u003ch3\u003eBrand Information\u003c\/h3\u003e\n  \u003cp\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e CATERPILLAR\u003c\/p\u003e\n  \u003cp\u003e\n    Caterpillar is a global manufacturer of engines and heavy equipment, with components designed for rugged, high-demand environments.\n  \u003c\/p\u003e\n\n  \u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003eVerify part number, specifications, and application before installation.\u003c\/li\u003e\n    \u003cli\u003eProfessional installation is recommended.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n\u003c\/div\u003e","brand":"CAT","offers":[{"title":"Default Title","offer_id":47630118519013,"sku":"6165729","price":599.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0315\/4437\/7480\/files\/594-8690-genuine-caterpillar-def-sensor-kit-advanced-truck-parts-24702.jpg?v=1755161244"}],"url":"https:\/\/advancedtruckparts.com\/collections\/caterpillar-def-sensors.oembed","provider":"ADVANCED TRUCK PARTS","version":"1.0","type":"link"}