{"product_id":"cat-nox-sensor-441-5128-04-c13-c15-773g-scr-sensor","title":"Nitrogen Oxide NOx Sensor 441-5128-04 \/ 441-5128 for Caterpillar CAT C13 C15 773G 775G 926M Heavy Equipment SCR System","description":"\u003cp data-start=\"152\" data-end=\"298\" class=\"PDq2pG_selectionAnchorContainer\"\u003e\u003cstrong data-start=\"152\" data-end=\"164\"\u003eFITMENT:\u003c\/strong\u003e\u003cbr data-start=\"164\" data-end=\"167\"\u003eCompatible with Caterpillar heavy-duty machines and engines equipped with SCR (Selective Catalytic Reduction) systems, including:\u003cspan aria-hidden=\"true\" class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul data-start=\"299\" data-end=\"562\"\u003e\n\u003cli data-section-id=\"60v0xu\" data-start=\"299\" data-end=\"318\"\u003eCAT C13 engines\u003c\/li\u003e\n\u003cli data-section-id=\"adw4xw\" data-start=\"319\" data-end=\"338\"\u003eCAT C15 engines\u003c\/li\u003e\n\u003cli data-section-id=\"ywpxd6\" data-start=\"339\" data-end=\"373\"\u003e773G \/ 775G off-highway trucks\u003c\/li\u003e\n\u003cli data-section-id=\"yn5k89\" data-start=\"374\" data-end=\"396\"\u003e926M wheel loaders\u003c\/li\u003e\n\u003cli data-section-id=\"1jzk1to\" data-start=\"397\" data-end=\"438\"\u003e349D \/ 374D excavators (SCR variants)\u003c\/li\u003e\n\u003cli data-section-id=\"1h071ox\" data-start=\"439\" data-end=\"496\"\u003e735 \/ 740 \/ 745 articulated trucks (system dependent)\u003c\/li\u003e\n\u003cli data-section-id=\"1ytcma8\" data-start=\"497\" data-end=\"562\"\u003eVarious CAT off-highway, mining, and industrial SCR platforms\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"564\" data-end=\"596\"\u003eOEM \/ Cross reference numbers:\u003c\/p\u003e\n\u003cul data-start=\"597\" data-end=\"746\"\u003e\n\u003cli data-section-id=\"1ewd2kd\" data-start=\"597\" data-end=\"641\"\u003e\u003cstrong data-start=\"599\" data-end=\"639\"\u003e441-5128 \/ 441-5128-03 \/ 441-5128-04\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-section-id=\"4ub6pr\" data-start=\"642\" data-end=\"691\"\u003e4415128 \/ 4415127 (related NOx sensor family)\u003c\/li\u003e\n\u003cli data-section-id=\"zu5dqv\" data-start=\"692\" data-end=\"746\"\u003e5WK96725A (aftermarket reference in some listings)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"748\" data-end=\"896\"\u003e📌 Verified OEM listing shows this is a \u003cstrong data-start=\"788\" data-end=\"822\"\u003eCat NOx Emissions Sensor Group\u003c\/strong\u003e used for SCR closed-loop control. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003chr data-start=\"898\" data-end=\"901\"\u003e\n\u003cp data-start=\"903\" data-end=\"918\"\u003e\u003cstrong data-start=\"903\" data-end=\"916\"\u003eFUNCTION:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"919\" data-end=\"1239\"\u003e\n\u003cli data-section-id=\"1cbyulz\" data-start=\"919\" data-end=\"974\"\u003eMeasures nitrogen oxide (NOx) levels in exhaust gas\u003c\/li\u003e\n\u003cli data-section-id=\"1vtg1l7\" data-start=\"975\" data-end=\"1030\"\u003eSends real-time data to ECU via J1939 communication\u003c\/li\u003e\n\u003cli data-section-id=\"v3qvlh\" data-start=\"1031\" data-end=\"1067\"\u003eControls SCR\/DEF dosing strategy\u003c\/li\u003e\n\u003cli data-section-id=\"5r8m8n\" data-start=\"1068\" data-end=\"1136\"\u003eProvides O2 monitoring (\u0026lt;20.9% range) for aftertreatment control\u003c\/li\u003e\n\u003cli data-section-id=\"1xrc0pc\" data-start=\"1137\" data-end=\"1197\"\u003eEnables fault detection (open\/short circuit diagnostics)\u003c\/li\u003e\n\u003cli data-section-id=\"1dxalcd\" data-start=\"1198\" data-end=\"1239\"\u003eEnsures EPA \/ EU emissions compliance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1241\" data-end=\"1244\"\u003e\n\u003cp data-start=\"1246\" data-end=\"1274\"\u003e\u003cstrong data-start=\"1246\" data-end=\"1272\"\u003eINSTALLATION POSITION:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1275\" data-end=\"1459\"\u003e\n\u003cli data-section-id=\"1qns4e2\" data-start=\"1275\" data-end=\"1345\"\u003eSCR system inlet or outlet NOx sensor (depending on configuration)\u003c\/li\u003e\n\u003cli data-section-id=\"10vjpe2\" data-start=\"1346\" data-end=\"1402\"\u003eMounted on exhaust line before or after SCR catalyst\u003c\/li\u003e\n\u003cli data-section-id=\"5zx9cd\" data-start=\"1403\" data-end=\"1459\"\u003eCommon in \u003cstrong data-start=\"1415\" data-end=\"1457\"\u003eengine-out and tailpipe-out SCR setups\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1461\" data-end=\"1464\"\u003e\n\u003cp data-start=\"1466\" data-end=\"1573\"\u003e\u003cstrong data-start=\"1466\" data-end=\"1485\"\u003eIMPORTANT NOTE:\u003c\/strong\u003e\u003cbr data-start=\"1485\" data-end=\"1488\"\u003eCaterpillar 441-5128-04 is part of a \u003cstrong data-start=\"1525\" data-end=\"1561\"\u003esmart SCR sensor assembly system\u003c\/strong\u003e, meaning:\u003c\/p\u003e\n\u003cul data-start=\"1574\" data-end=\"1793\"\u003e\n\u003cli data-section-id=\"1sn61qu\" data-start=\"1574\" data-end=\"1623\"\u003eIncludes probe + electronics + harness module\u003c\/li\u003e\n\u003cli data-section-id=\"14tklgk\" data-start=\"1624\" data-end=\"1676\"\u003eInlet and outlet sensors are NOT interchangeable\u003c\/li\u003e\n\u003cli data-section-id=\"1ooioso\" data-start=\"1677\" data-end=\"1748\"\u003eDifferent engine applications may require different harness lengths\u003c\/li\u003e\n\u003cli data-section-id=\"1uxydh7\" data-start=\"1749\" data-end=\"1793\"\u003eECU calibration defines correct function\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1795\" data-end=\"1874\"\u003eIncorrect installation may cause SCR fault codes, derate, or emissions failure.\u003c\/p\u003e\n\u003chr data-start=\"1876\" data-end=\"1879\"\u003e\n\u003cp data-start=\"1881\" data-end=\"1891\"\u003e\u003cstrong data-start=\"1881\" data-end=\"1889\"\u003eFAQ:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1893\" data-end=\"2018\"\u003e\u003cstrong data-start=\"1893\" data-end=\"1932\"\u003eQ1: Is this inlet or outlet sensor?\u003c\/strong\u003e\u003cbr data-start=\"1932\" data-end=\"1935\"\u003eA1: It can be used as inlet or outlet depending on CAT C13\/C15 SCR configuration.\u003c\/p\u003e\n\u003cp data-start=\"2020\" data-end=\"2145\"\u003e\u003cstrong data-start=\"2020\" data-end=\"2054\"\u003eQ2: What machines does it fit?\u003c\/strong\u003e\u003cbr data-start=\"2054\" data-end=\"2057\"\u003eA2: CAT 773G, 775G trucks, 926M loader, C13\/C15 engines, excavators, mining equipment.\u003c\/p\u003e\n\u003cp data-start=\"2147\" data-end=\"2266\"\u003e\u003cstrong data-start=\"2147\" data-end=\"2181\"\u003eQ3: What are failure symptoms?\u003c\/strong\u003e\u003cbr data-start=\"2181\" data-end=\"2184\"\u003eA3: SCR warning light, NOx sensor fault codes, engine derate, DEF system errors.\u003c\/p\u003e\n\u003cp data-start=\"2268\" data-end=\"2398\"\u003e\u003cstrong data-start=\"2268\" data-end=\"2314\"\u003eQ4: Are 441-5128-04 and 441-5128 the same?\u003c\/strong\u003e\u003cbr data-start=\"2314\" data-end=\"2317\"\u003eA4: Yes, 441-5128-04 is a revised version within the same Cat NOx sensor group.\u003c\/p\u003e\n\u003cp data-start=\"2400\" data-end=\"2534\"\u003e\u003cstrong data-start=\"2400\" data-end=\"2446\"\u003eQ5: Does installation require programming?\u003c\/strong\u003e\u003cbr data-start=\"2446\" data-end=\"2449\"\u003eA5: Some CAT machines require SCR calibration or parameter reset after replacement.\u003c\/p\u003e","brand":"ASHENG","offers":[{"title":"Default Title","offer_id":51652443668612,"sku":"441-5128-04","price":189.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0966\/8313\/1012\/files\/12_c609ae09-500b-4d5d-8cf1-a28b5ce462ec.jpg?v=1773993139","url":"https:\/\/www.jslook.com\/products\/cat-nox-sensor-441-5128-04-c13-c15-773g-scr-sensor","provider":"ASHENG","version":"1.0","type":"link"}