{"product_id":"o2-oxygen-sensor-upstream-downstream-for-ford-expedition-1997-2008-4-6l-5-4l","title":"O2 Oxygen Sensor Upstream Downstream for Ford Expedition (1997-2008) 4.6L, 5.4L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit O2 Oxygen Sensor Upstream and Downstream Set for 1997-2008 Ford Expedition (UN93 \/ U222 \/ U324)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The O2 Oxygen Sensor Upstream and Downstream Set monitors exhaust gas oxygen concentration on the 1997-2008 Ford Expedition to optimize air-fuel mixture control and ensure catalytic converter efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Ford Expedition Oxygen Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eOver prolonged duty cycles, factory oxygen sensors on the \u003cstrong\u003eUN93\u003c\/strong\u003e, \u003cstrong\u003eU222\u003c\/strong\u003e, and \u003cstrong\u003eU324\u003c\/strong\u003e platforms suffer from silica contamination, fuel additive glazing, and thermal fatigue. As the internal zirconia electrolytic core and platinum electrodes foul from exhaust blow-by, reaction times slow down dramatically. This sensor lag skews short-term and long-term fuel trims, forcing the \u003cstrong\u003eFord Modular V8\u003c\/strong\u003e PCM into rich-running defensive maps. Symptoms include degraded fuel economy, rough idle, hesitation under load, and diagnostic trouble codes including \u003cstrong\u003eP0130\u003c\/strong\u003e, \u003cstrong\u003eP0161\u003c\/strong\u003e, \u003cstrong\u003eP0420\u003c\/strong\u003e, and \u003cstrong\u003eP0430\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis 4-piece replacement set delivers precise closed-loop stoic feedback via high-grade ceramic sensing elements protected by double-laser-welded stainless steel housings. Manufactured to match exact OEM harness lengths, wire gauges, and weather-pack pinouts, each sensor threads directly into standard M18x1.5 factory exhaust bungs without wire splicing or pin repinning. Replacing both bank 1 and bank 2 upstream regulation sensors alongside post-cat monitoring sensors restores factory baseline lambda response, stabilizes combustion stoichiometry, and clears catalyst-efficiency check engine lights.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2 Upstream Oxygen Sensors\u003c\/li\u003e\n  \u003cli\u003e2 Downstream Oxygen Sensors\u003c\/li\u003e\n\u003c\/ul\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;\"\u003e1997-2008 Ford Expedition\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;\"\u003eFord Modular V8 (4.6L \/ 5.4L) \/ UN93, U222, U324\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;\"\u003e215-300 hp \/ 290-365 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;\"\u003eSG1813, SG1801, SG1802, SG1803, SG1806, SG1807, SG1808, SG1814, SG726, SG459\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\u003e1997-2008 Ford Expedition 4.6L V8\u003c\/li\u003e\n  \u003cli\u003e1997-2008 Ford Expedition 5.4L V8\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the UN93 \/ U222 \/ U324 Expedition?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 1997-2008 Ford Expedition equipped with the \u003cstrong\u003eFord Modular V8\u003c\/strong\u003e 4.6L and 5.4L engines across all generation chassis. Always verify connector keying and harness lengths prior to installation.\u003c\/p\u003e\n\n\u003ch4\u003eWhat precautions should be taken when installing these oxygen sensors?\u003c\/h4\u003e\n\u003cp\u003eUse a designated slotted oxygen sensor socket, apply high-temperature anti-seize exclusively to the external threads while keeping the porous sensor tip completely clean, and route harness wiring safely away from direct exhaust runner heat.\u003c\/p\u003e\n\n\u003ch3\u003eThe Ford Heavy-Duty Standard\u003c\/h3\u003e\n\u003cp\u003eFull-size truck chassis and heavy-duty towing applications place intense thermal demands on exhaust monitoring components; these direct-replacement sensors ensure balanced combustion, maximum pulling efficiency, and extended catalytic converter life under heavy payload conditions.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67907901980920,"sku":"DS-E2MQKRDSN","price":102.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-ford-expedition-1997-2008-4-6l-5-4l-1.jpg?v=1793381433","url":"https:\/\/performancechiptuning.com\/de\/products\/o2-oxygen-sensor-upstream-downstream-for-ford-expedition-1997-2008-4-6l-5-4l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}