{"title":"Diesel Exhaust Fluid DEF Components | Truck Parts Planet","description":"\u003cp\u003eDiesel Exhaust Fluid DEF Components are essential parts of modern diesel aftertreatment systems, helping deliver, monitor, heat, and control diesel exhaust fluid used by the SCR system to reduce nitrogen oxide emissions. At Truck Parts Planet, we offer dependable DEF system parts for medium- and heavy-duty commercial trucks used in professional repair, replacement, diagnostics, and emissions-system maintenance.\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003cp\u003eOur collection may include DEF pumps, DEF injectors, DEF headers, DEF tanks, level sensors, heater assemblies, dosing modules, hoses, connectors, seals, brackets, and related system hardware. These components work together with SCR catalysts, NOx sensors, exhaust temperature sensors, and electronic control systems to support proper DEF delivery and emissions treatment.\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003cp\u003eCommercial diesel trucks operate under demanding conditions where DEF systems are exposed to vibration, temperature changes, moisture, road debris, crystallized fluid deposits, and continuous use. Over time, damaged or malfunctioning Diesel Exhaust Fluid DEF Components can contribute to warning lights, poor DEF dosing, low-pressure faults, incorrect fluid-level readings, heater problems, diagnostic trouble codes, SCR efficiency issues, or engine derate conditions. Replacing failed components can help restore proper DEF system performance and normal aftertreatment operation.\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003cp\u003eTruck Parts Planet carries DEF system parts for many popular commercial truck makes and heavy-duty diesel engine platforms. Product listings include available OEM or manufacturer part numbers, specifications, connector details, compatibility information, and clear product photos to help customers identify the correct replacement before ordering.\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003cp\u003eOur selection is suitable for owner-operators, fleet maintenance departments, diesel repair facilities, emissions specialists, and professional technicians servicing commercial vehicle aftertreatment systems. Many products are stocked in our USA warehouse for fast order processing and convenient nationwide shipping.\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e\n\n\u003cp\u003eBrowse Diesel Exhaust Fluid DEF Components at Truck Parts Planet to find reliable replacement parts for your commercial truck emissions system. If you are unsure about compatibility, contact us with your truck model, engine information, VIN, or existing part number, and our team can help you identify the appropriate component.\u003c\/p\u003e\n\n\u003cp\u003e\u003c\/p\u003e","products":[{"product_id":"s17h0e0042-genuine-oem-hino-24v-def-pump","title":"S17H0E0042 | Genuine OEM Hino 24V DEF Pump","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eS17H0E0042 | Genuine OEM Hino 24V Diesel Exhaust Fluid (DEF) Pump\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Hino Diesel Exhaust Fluid (DEF) Pump, part number \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eS17H0E0042\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, is a 24V pump designed to deliver DEF within a compatible diesel exhaust aftertreatment system. It supports the Selective Catalytic Reduction (SCR) system, which uses DEF to help reduce nitrogen oxide emissions. Verify the part number, voltage, and vehicle configuration before ordering.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003ePRODUCT INFORMATION\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePart Number:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e S17H0E0042\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBrand:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Hino\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePart Name:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Diesel Exhaust Fluid (DEF) Pump\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eComponent Type:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e DEF Pump\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eVoltage:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 24V\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSystem:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Selective Catalytic Reduction (SCR) \/ Exhaust Aftertreatment\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCross Reference:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e S17H0-E0042\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCondition:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Confirm the actual condition of the item before purchase.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eAPPLICATIONS\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe Hino DEF pump is intended for compatible commercial vehicle applications using a 24V DEF delivery system. Exact vehicle and engine fitment for \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eS17H0E0042\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e should be confirmed using the vehicle identification number (VIN), engine information, and the original pump part number.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDo not assume that similar-looking DEF pumps or related part numbers are interchangeable without confirmation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eFUNCTION\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe DEF pump supplies and circulates Diesel Exhaust Fluid through the vehicle's aftertreatment system as required for SCR operation. Correct DEF delivery helps the emissions system operate as designed and supports the reduction of nitrogen oxide emissions.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eCOMMON SIGNS OF DEF PUMP FAILURE\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eA worn, damaged, or failing DEF pump may cause symptoms such as:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDEF pump or SCR system fault codes.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDashboard emissions-system warning lights.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eReduced engine power or an engine derate.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDEF pressure or delivery faults.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eIrregular DEF supply or dosing-system operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eFailure of the aftertreatment system to complete normal operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eThese symptoms can have other causes, including clogged filters, damaged lines, faulty sensors, or wiring problems. Follow the manufacturer's diagnostic procedure before replacing the pump.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eWHY REPLACE A HINO DEF PUMP?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eA functioning DEF pump is important for proper fluid delivery to the SCR aftertreatment system. Replacing a confirmed faulty pump with the correct 24V component can help restore DEF supply and support normal emissions-system operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eFITMENT INFORMATION\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eBefore purchasing \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eHino S17H0E0042\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, verify the part number and 24V specification against the existing pump. Confirm compatibility using the vehicle VIN, engine model, connector arrangement, and applicable OEM parts catalog.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe alternate format \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eS17H0-E0042\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is listed as a cross-reference for this part. Confirm that it matches your specific application before ordering.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eGENUINE HINO PART\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThis listing identifies the product as a Hino 24V Diesel Exhaust Fluid (DEF) Pump, part number \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eS17H0E0042\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Verify authenticity, condition, and included components against the actual item and its supporting documentation before publishing or purchasing.\u003c\/span\u003e\u003c\/p\u003e","brand":"Hino","offers":[{"title":"Default Title","offer_id":49898209509635,"sku":"S17H0E0042","price":1099.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0838\/9289\/6003\/files\/HinoDieselExhaustFluid_DEF_Pump24V1.jpg?v=1792410488"},{"product_id":"21534115-genuine-oem-volvo-mack-ahi-dosing-module","title":"21534115 | Genuine OEM Volvo \/ Mack AHI Dosing Module","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e21534115 | Genuine OEM Volvo \/ Mack AHI Dosing Module\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Genuine Volvo \/ Mack AHI Dosing Module, part number \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e21534115\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, is a component of the diesel exhaust aftertreatment system. It supports hydrocarbon dosing used during Diesel Particulate Filter (DPF) regeneration, helping the system manage accumulated soot. This module is listed for compatible 12V Volvo and Mack heavy-duty trucks. \u0026lt;Cite refs={[\"turn243958search0\",\"turn243958search1\"]}\/\u0026gt;\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003ePRODUCT INFORMATION\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePart Number:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 21534115\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBrand:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Volvo \/ Mack\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eProduct Name:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e AHI Dosing Module\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eComponent:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Aftertreatment Hydrocarbon Injector Driver Module\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSystem:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Diesel Exhaust Aftertreatment\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eVoltage:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 12V\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eEngine Applications:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Selected Volvo D11, D13, D16 and Mack MP7, MP8 applications\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCondition:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Verify the actual item's condition before listing\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eAPPLICATIONS\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003ePart number \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e21534115\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e is listed for selected Volvo and Mack trucks equipped with compatible aftertreatment systems. Applications may include Volvo VNL, VNM, VHD and VAH models, as well as selected Mack Pinnacle, Granite, Anthem, CHU, CXU, GU and MRU models.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eVehicle compatibility varies by model year, engine, and emissions configuration. Verify the VIN, engine serial number, and existing part number before purchase. \u0026lt;Cite refs={[\"turn243958search0\",\"turn243958search6\"]}\/\u0026gt;\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eFUNCTION\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe AHI (Aftertreatment Hydrocarbon Injector) dosing module controls the hydrocarbon injection process used to support DPF regeneration. Proper operation helps the aftertreatment system burn accumulated soot and maintain exhaust filtration performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eCOMMON SIGNS OF AHI DOSING MODULE FAILURE\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eA worn or failing AHI dosing module may be associated with symptoms such as:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDPF regeneration failures or interruptions\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAftertreatment warning lights\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eEngine or emissions-related diagnostic trouble codes\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eReduced engine performance or an emissions-related derate\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eAbnormal hydrocarbon dosing operation\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRepeated soot accumulation or DPF restriction warnings\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eThese symptoms can also result from injector, wiring, sensor, fuel supply, or other aftertreatment problems. Diagnosis is recommended before replacing the module.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eWHY REPLACE AN AHI DOSING MODULE?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eReplacing a confirmed faulty AHI dosing module helps restore proper control of the hydrocarbon dosing process and supports normal DPF regeneration. Correct diagnosis is important because related aftertreatment faults can produce similar symptoms.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eFITMENT INFORMATION\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eBefore ordering part \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e21534115\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, verify:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eOEM part number and any superseding number\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eVehicle VIN and model year\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eEngine model and serial number\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e12V electrical system\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eConnector, mounting, and dosing system configuration\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eOther numbers, including \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e21870667, 22452551, and 23185531\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, are listed as cross-references by some suppliers. These numbers should not be treated as guaranteed interchangeable without confirming the specific application. \u0026lt;Cite refs={[\"turn243958search1\",\"turn243958search4\"]}\/\u0026gt;\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eGENUINE VOLVO \/ MACK PART\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThis listing identifies the component as a Volvo \/ Mack AHI Dosing Module with part number \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e21534115\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Confirm the product label, manufacturer markings, packaging, and actual condition before describing it as new or genuine OEM inventory.\u003c\/span\u003e\u003c\/p\u003e","brand":"Volvo \/ Mack","offers":[{"title":"Default Title","offer_id":49915664695555,"sku":"21534115","price":649.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0838\/9289\/6003\/files\/Volvo_MackAHIDosingSystemModule1.jpg?v=1792527639"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0838\/9289\/6003\/collections\/ChatGPT_Image_Sep_22_2026_09_25_12_PM.png?v=1790182761","url":"https:\/\/truckpartsplanet.com\/es\/collections\/diesel-exhaust-fluid-def-components.oembed","provider":"TRUCK PARTS PLANET","version":"1.0","type":"link"}