{"product_id":"catalytic-converter-for-ford-expedition-2003-2004-5-4l-left-right","title":"Catalytic Converter for Ford Expedition (2003-2004) 5.4L Left \u0026 Right","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Left \u0026amp; Right Catalytic Converter Set for 2003-2004 Ford Expedition (U222)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The catalytic converter set replaces deteriorated factory emissions equipment on the 2003-2004 Ford Expedition to restore correct exhaust backpressure, eliminate P0420\/P0430 DTC codes, and ensure reliable 48-state emissions compliance.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Ford Expedition Substrate Degradation\u003c\/h3\u003e\n\u003cp\u003eThe factory catalytic converters on the \u003cstrong\u003eU222\u003c\/strong\u003e Expedition endure sustained exhaust gas temperatures that degrade the internal washcoat over extended mileage. Compounded by common ignition misfires or unburned fuel wash from the 2-valve \u003cstrong\u003e5.4L Triton V8\u003c\/strong\u003e, the stock ceramic monoliths frequently suffer thermal shock, structural sintering, and substrate clogging. This degradation creates elevated exhaust backpressure, increases cylinder head temperatures, robs towing power, and triggers persistent check engine lights.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered as a direct-fit dual-bank replacement, this left- and right-side converter assembly features mandrel-formed aluminized steel tubing to resist road debris, road salt, and harsh thermal cycling. Internally, a heavy-duty ceramic substrate utilizes an optimized cell density to maximize surface contact, accelerating catalytic light-off and neutralizing exhaust emissions without choking scavenging flow. Integrated factory-location O2 sensor bungs, reinforced brackets, and thick-gauge flanges replicate interchange units \u003cstrong\u003e30465\u003c\/strong\u003e, \u003cstrong\u003e30466\u003c\/strong\u003e, \u003cstrong\u003e19036\u003c\/strong\u003e, and \u003cstrong\u003e19136\u003c\/strong\u003e for a precise bolt-on installation without welding.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2003-2004 Ford Expedition (Built After 10\/17\/2002)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e5.4L Triton V8 \/ U222\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e260 hp \/ 350 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e30465, 30466, 19036, 19136\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2003-2004 Ford Expedition Eddie Bauer 5.4L V8 (Production dates after 10\/17\/2002)\u003c\/li\u003e\n  \u003cli\u003e2003-2004 Ford Expedition XLT 5.4L V8 (Production dates after 10\/17\/2002)\u003c\/li\u003e\n  \u003cli\u003e2004 Ford Expedition NBX 5.4L V8\u003c\/li\u003e\n  \u003cli\u003e2004 Ford Expedition XLS 5.4L V8\u003c\/li\u003e\n  \u003cli\u003eNote: Fits 5.4L V8 models only; does not fit 4.6L V8 engines. 48-state legal (restricted in CA, NY, CO, and ME).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the U222 Expedition?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2003-2004 Ford Expedition equipped with the 5.4L Triton engine built after October 17, 2002.\u003c\/p\u003e\n\n\u003ch4\u003eWill this resolve P0420 and P0430 trouble codes?\u003c\/h4\u003e\n\u003cp\u003eYes, replacing deteriorated factory converters with this high-efficiency substrate restores catalyst oxygen storage capacity, resolving P0420 and P0430 DTCs.\u003c\/p\u003e\n\n\u003ch3\u003eThe Ford Towing Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to handle sustained load and trailering demands, this exhaust assembly maintains critical low-end torque curves and factory thermal management under heavy utility use.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67537813537016,"sku":"DS-E2L6RVLO1","price":258.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-ford-expedition-2003-2004-5-4l-left-right-1.jpg?v=1790617685","url":"https:\/\/performancechiptuning.com\/products\/catalytic-converter-for-ford-expedition-2003-2004-5-4l-left-right","provider":"Performance Chip Tuning","version":"1.0","type":"link"}