{"product_id":"catalytic-converter-for-mercury-mountaineer-2006-2010-4-0l-rear","title":"Catalytic Converter for Mercury Mountaineer (2006-2010) 4.0L Rear","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Rear Catalytic Converter for 2006-2010 Mercury Mountaineer (U251)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The direct-fit rear catalytic converter replaces degraded factory emissions units on the 2006-2010 Mercury Mountaineer to clear catalyst efficiency DTCs, restore exhaust scavenging, and maintain legal tailpipe emissions.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Mercury Mountaineer Substrate Degradation\u003c\/h3\u003e\n\u003cp\u003eFactory catalytic converters on the \u003cstrong\u003eU251\u003c\/strong\u003e platform regularly face substrate breakdown under thermal cycling and sustained exhaust gas temperatures. In the \u003cstrong\u003e4.0L Cologne SOHC V6\u003c\/strong\u003e, aging OEM washcoats experience precious metal sintering and internal cell sintering, causing catalytic inefficiency codes such as P0420 or P0430. Furthermore, thermal shock and engine blow-by contaminate the original ceramic brick, inducing substrate crumbling, increased exhaust backpressure, poor fuel economy, and potential internal exhaust restriction.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered as a direct bolt-on assembly, this rear converter replaces worn components without cutting or welding. Constructed with an anti-corrosion 409 stainless steel outer shell, it houses a heavy-duty, high-flow ceramic honeycomb substrate coated in an optimized precious metal washcoat to maximize emissions conversion efficiency. Precision laser-cut flanges match factory exhaust hangars and mating pipes, ensuring leak-free joint seals that maintain accurate downstream O2 sensor feedback without triggering check engine lights.\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;\"\u003e2006-2010 Mercury Mountaineer\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;\"\u003e\n\u003cstrong\u003e4.0L Cologne V6\u003c\/strong\u003e \/ \u003cstrong\u003eU251\u003c\/strong\u003e\n\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;\"\u003e210 hp \/ 254 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;\"\u003e\n\u003cstrong\u003e6L2Z5F250A\u003c\/strong\u003e, \u003cstrong\u003e6L2Z5F250AB\u003c\/strong\u003e, \u003cstrong\u003e16434\u003c\/strong\u003e, \u003cstrong\u003e30460\u003c\/strong\u003e, \u003cstrong\u003e645430\u003c\/strong\u003e\n\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\u003e2006 Mercury Mountaineer Base \/ Convenience \/ Luxury \/ Premier 4.0L V6 - Rear\u003c\/li\u003e\n  \u003cli\u003e2007 Mercury Mountaineer Base \/ Convenience \/ Luxury \/ Premier 4.0L V6 - Rear\u003c\/li\u003e\n  \u003cli\u003e2008 Mercury Mountaineer Base \/ Premier 4.0L V6 - Rear\u003c\/li\u003e\n  \u003cli\u003e2009 Mercury Mountaineer Base \/ Premier 4.0L V6 - Rear\u003c\/li\u003e\n  \u003cli\u003e2010 Mercury Mountaineer Base \/ Premier 4.0L V6 - Rear\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the U251 Mountaineer?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2006-2010 Mercury Mountaineer equipped with the \u003cstrong\u003e4.0L Cologne V6\u003c\/strong\u003e engine.\u003c\/p\u003e\n\n\u003ch4\u003eWill this rear catalytic converter clear OBD-II catalyst efficiency codes like P0420 or P0430?\u003c\/h4\u003e\n\u003cp\u003eYes, its high-load catalytic washcoat restores factory emissions reduction efficiency to clear catalyst-related error codes provided upstream fueling and O2 sensors function properly.\u003c\/p\u003e\n\n\u003ch3\u003eThe Mercury Durability Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt for the daily demands of midsize SUV towing and severe-duty commuting, this converter assembly resists thermal fatigue and road-spray corrosion, ensuring long-term emissions integrity and backpressure control on your Mountaineer.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67537826349304,"sku":"DS-ESPLP31BZ","price":248.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-mercury-mountaineer-2006-2010-4-0l-rear-2.jpg?v=1790617905","url":"https:\/\/performancechiptuning.com\/es\/products\/catalytic-converter-for-mercury-mountaineer-2006-2010-4-0l-rear","provider":"Performance Chip Tuning","version":"1.0","type":"link"}