{"product_id":"2123990-genuine-paccar®-egr-control-valve","title":"2123990 | Genuine Paccar® EGR Control Valve","description":"\u003cp\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e: EGR Control Valve\u003cbr\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e: New\u003cbr\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e: Paccar®\u003cbr\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e: \u003cspan\u003e2123990\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp data-end=\"143\" data-start=\"0\"\u003eAn EGR Control Valve\u003cstrong\u003e 2123990 \u003c\/strong\u003e- short for Exhaust Gas Recirculation Control Valve - is a key part of a vehicle’s emissions control system. The EGR valve reduces nitrogen oxide (NOx) emissions, which are harmful pollutants produced when an engine burns fuel at high temperatures.\u003cbr\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cbr\u003e\n\u003cul data-end=\"688\" data-start=\"246\"\u003e\n\u003cli data-end=\"403\" data-start=\"246\"\u003e\n\u003cp data-end=\"403\" data-start=\"248\"\u003eWhen an engine burns fuel, high combustion temperatures cause \u003cstrong data-end=\"327\" data-start=\"310\"\u003enitrogen (N₂)\u003c\/strong\u003e and \u003cstrong data-end=\"347\" data-start=\"332\"\u003eoxygen (O₂)\u003c\/strong\u003e in the air to combine into \u003cstrong data-end=\"400\" data-start=\"375\"\u003enitrogen oxides (NOx)\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"479\" data-start=\"404\"\u003e\n\u003cp data-end=\"479\" data-start=\"406\"\u003eNOx gases contribute to \u003cstrong data-end=\"447\" data-start=\"430\"\u003eair pollution\u003c\/strong\u003e, \u003cstrong data-end=\"457\" data-start=\"449\"\u003esmog\u003c\/strong\u003e, and \u003cstrong data-end=\"476\" data-start=\"463\"\u003eacid rain\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"578\" data-start=\"480\"\u003e\n\u003cp data-end=\"578\" data-start=\"482\"\u003eThe \u003cstrong data-end=\"499\" data-start=\"486\"\u003eEGR valve\u003c\/strong\u003e helps prevent this by recirculating some exhaust gases back into the intake.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"688\" data-start=\"579\"\u003e\n\u003cp data-end=\"688\" data-start=\"581\"\u003eThis \u003cstrong data-end=\"618\" data-start=\"586\"\u003edilutes the air-fuel mixture\u003c\/strong\u003e and \u003cstrong data-end=\"656\" data-start=\"623\"\u003elowers combustion temperature\u003c\/strong\u003e, so \u003cstrong data-end=\"673\" data-start=\"661\"\u003eless NOx\u003c\/strong\u003e is produced.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"725\" data-start=\"695\"\u003e\u003cstrong data-end=\"725\" data-start=\"702\"\u003eAdditional Benefits \u003cspan\u003e2123990\u003c\/span\u003e \u003c\/strong\u003e\u003c\/p\u003e\n\u003col data-end=\"1149\" data-start=\"726\"\u003e\n\u003cli data-end=\"817\" data-start=\"726\"\u003e\n\u003cp data-end=\"817\" data-start=\"729\"\u003e\u003cstrong data-end=\"757\" data-start=\"729\"\u003eBetter Emissions Control\u003c\/strong\u003e – Meets environmental regulations by reducing NOx output.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"935\" data-start=\"818\"\u003e\n\u003cp data-end=\"935\" data-start=\"821\"\u003e\u003cstrong data-end=\"862\" data-start=\"821\"\u003eImproved Fuel Economy (in some cases)\u003c\/strong\u003e – A cooler combustion chamber can reduce the need for fuel enrichment.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1033\" data-start=\"936\"\u003e\n\u003cp data-end=\"1033\" data-start=\"939\"\u003e\u003cstrong data-end=\"963\" data-start=\"939\"\u003eReduced Engine Knock\u003c\/strong\u003e – Lower combustion temperatures help prevent knocking or “pinging.”\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1149\" data-start=\"1034\"\u003e\n\u003cp data-end=\"1149\" data-start=\"1037\"\u003e\u003cstrong data-end=\"1066\" data-start=\"1037\"\u003eEnhanced Engine Longevity\u003c\/strong\u003e – Keeps the combustion process more stable and reduces stress on internal parts.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eSigns of Faulty \u003cspan\u003e2123990\u003c\/span\u003e \u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e \n\u003cp data-end=\"292\" data-start=\"256\"\u003e\u003cstrong\u003e1. Rough Idle or Stalling\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"500\" data-start=\"293\"\u003e\n\u003cli data-end=\"388\" data-start=\"293\"\u003e\n\u003cp data-end=\"388\" data-start=\"295\"\u003eIf the EGR valve \u003cstrong data-end=\"327\" data-start=\"312\"\u003esticks open\u003c\/strong\u003e, too much exhaust gas enters the intake when it shouldn’t.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"500\" data-start=\"389\"\u003e\n\u003cp data-end=\"500\" data-start=\"391\"\u003eThis causes the air-fuel mixture to become unstable at idle → engine may \u003cstrong data-end=\"497\" data-start=\"464\"\u003eshake, idle roughly, or stall\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"547\" data-start=\"507\"\u003e \u003cstrong data-end=\"547\" data-start=\"514\"\u003e2. Engine Knocking or Pinging\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"745\" data-start=\"548\"\u003e\n\u003cli data-end=\"616\" data-start=\"548\"\u003e\n\u003cp data-end=\"616\" data-start=\"550\"\u003eIf the EGR valve \u003cstrong data-end=\"584\" data-start=\"567\"\u003esticks closed\u003c\/strong\u003e, no exhaust gas recirculates.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"745\" data-start=\"617\"\u003e\n\u003cp data-end=\"745\" data-start=\"619\"\u003eCombustion temperatures rise, leading to \u003cstrong data-end=\"685\" data-start=\"660\"\u003espark knock (pinging)\u003c\/strong\u003e or \u003cstrong data-end=\"703\" data-start=\"689\"\u003edetonation\u003c\/strong\u003e, especially under load or acceleration.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"790\" data-start=\"752\"\u003e\u003cstrong data-end=\"790\" data-start=\"759\"\u003e3. Check Engine Light (CEL)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"1021\" data-start=\"791\"\u003e\n\u003cli data-end=\"853\" data-start=\"791\"\u003e\n\u003cp data-end=\"853\" data-start=\"793\"\u003eThe \u003cstrong data-end=\"826\" data-start=\"797\"\u003eECU (engine control unit)\u003c\/strong\u003e monitors the EGR system.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"967\" data-start=\"854\"\u003e\n\u003cp data-end=\"967\" data-start=\"856\"\u003eIf it detects that the EGR flow is too low, too high, or erratic, it will trigger the \u003cstrong data-end=\"964\" data-start=\"942\"\u003eCheck Engine Light\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1021\" data-start=\"968\"\u003e\n\u003cp data-end=\"1021\" data-start=\"970\"\u003eCommon EGR-related codes include \u003cstrong data-end=\"1018\" data-start=\"1003\"\u003eP0400–P0409\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1059\" data-start=\"1028\"\u003e\u003cstrong data-end=\"1059\" data-start=\"1035\"\u003e4. Poor Fuel Economy\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"1209\" data-start=\"1060\"\u003e\n\u003cli data-end=\"1131\" data-start=\"1060\"\u003e\n\u003cp data-end=\"1131\" data-start=\"1062\"\u003eA malfunctioning EGR valve can mess up the engine’s air-fuel ratio.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1209\" data-start=\"1132\"\u003e\n\u003cp data-end=\"1209\" data-start=\"1134\"\u003eThe ECU may compensate by adding more fuel → \u003cstrong data-end=\"1206\" data-start=\"1179\"\u003ereduced fuel efficiency\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1273\" data-start=\"1216\"\u003e\u003cstrong data-end=\"1273\" data-start=\"1224\"\u003e5. Increased Emissions \/ Failed Emission Test\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"1390\" data-start=\"1274\"\u003e\n\u003cli data-end=\"1331\" data-start=\"1274\"\u003e\n\u003cp data-end=\"1331\" data-start=\"1276\"\u003eWithout proper EGR function, \u003cstrong data-end=\"1322\" data-start=\"1305\"\u003eNOx emissions\u003c\/strong\u003e go up.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1390\" data-start=\"1332\"\u003e\n\u003cp data-end=\"1390\" data-start=\"1334\"\u003eThis often causes a \u003cstrong data-end=\"1387\" data-start=\"1354\"\u003efailed smog or emissions test\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-end=\"1437\" data-start=\"1397\"\u003e\u003cstrong data-end=\"1437\" data-start=\"1404\"\u003e6. Reduced Engine Performance\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-end=\"1581\" data-start=\"1438\"\u003e\n\u003cli data-end=\"1581\" data-start=\"1438\"\u003e\n\u003cp data-end=\"1581\" data-start=\"1440\"\u003eA bad EGR valve can cause \u003cstrong data-end=\"1480\" data-start=\"1466\"\u003ehesitation\u003c\/strong\u003e, \u003cstrong data-end=\"1499\" data-start=\"1482\"\u003eloss of power\u003c\/strong\u003e, or \u003cstrong data-end=\"1526\" data-start=\"1504\"\u003erough acceleration\u003c\/strong\u003e, especially if it opens or closes at the wrong time.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eManufacturer information\u003c\/strong\u003e\u003cbr\u003eHeadquartered in Bellevue, WA, PACCAR® is a Fortune 500 company specializing in heavy duty commercial vehicles. Founded in 1915 as the Pacific Car and Railway Company, PACCAR Inc grew from a small railway equipment supplier to one of the world's largest manufacturers of light, medium, and heavy duty trucks. It is a major designer and manufacturer of diesel engines and powertrain components through dealer networks in over 2,200 locations around the world. The company also operates parts distribution centers for aftermarket support that includes customer call centers operating 24 hours a day and state-of-the-art inventory management systems that speed up order processing.\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003cbr\u003eFirst Truck Parts offers a \u003cstrong\u003e365-days\u003c\/strong\u003e \u003cstrong\u003ewarranty\u003c\/strong\u003e for all types of parts and in any condition. The warranty applies only to buyers who have placed an order on our website.\u003c\/p\u003e\n\u003cdiv id=\"gtx-trans\" style=\"position: absolute; left: 202px; top: 327.094px;\"\u003e\n\u003cdiv class=\"gtx-trans-icon\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Paccar®","offers":[{"title":"Default Title","offer_id":48113493016820,"sku":"2123990","price":2789.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0605\/1479\/5764\/files\/2025-11-05232617.png?v=1762380932","url":"https:\/\/firsttruckparts.com\/products\/2123990-genuine-paccar%c2%ae-egr-control-valve","provider":"First Truck Parts","version":"1.0","type":"link"}