{"product_id":"o2-oxygen-sensor-upstream-downstream-for-ford-fusion-2017-2020-2-5l","title":"O2 Oxygen Sensor Upstream Downstream for Ford Fusion (2017-2020) 2.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Upstream \u0026amp; Downstream O2 Oxygen Sensor Kit for 2017-2020 Ford Fusion (CD4)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This matched upstream (Bank 1 Sensor 1) and downstream (Bank 1 Sensor 2) oxygen sensor kit restores closed-loop air-fuel metering and catalyst monitoring on the 2017-2020 Ford Fusion \u003cstrong\u003eCD4\u003c\/strong\u003e with the \u003cstrong\u003e2.5L Duratec I4\u003c\/strong\u003e engine.\u003c\/p\u003e\u003ch3\u003eThe Stock Ford Fusion Sensor Failure\u003c\/h3\u003e\u003cp\u003eOver high mileage on the \u003cstrong\u003eCD4\u003c\/strong\u003e chassis, factory Bank 1 Sensor 1 and Sensor 2 units on the \u003cstrong\u003e2.5L Duratec I4\u003c\/strong\u003e suffer thermal fatigue, heater circuit burnout, and zirconia contamination. Carbon fouling slows voltage switching between rich and lean states, disrupting PCM fuel trim control. This degradation triggers fault codes including \u003cstrong\u003eP0133\u003c\/strong\u003e, \u003cstrong\u003eP0135\u003c\/strong\u003e, \u003cstrong\u003eP0141\u003c\/strong\u003e, and \u003cstrong\u003eP0171\u003c\/strong\u003e.\u003c\/p\u003e\u003ch4\u003eCommon Symptoms of a Failing OEM Oxygen Sensor\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck Engine Light \/ DTCs:\u003c\/strong\u003e Triggers codes like \u003cstrong\u003eP0133\u003c\/strong\u003e, \u003cstrong\u003eP0135\u003c\/strong\u003e, or \u003cstrong\u003eP0141\u003c\/strong\u003e from slow switching or heater circuit failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoor Fuel Economy \u0026amp; Idle:\u003c\/strong\u003e Sluggish upstream feedback forces rich fueling, rough idle, and reduced MPG.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFailed Emissions Testing:\u003c\/strong\u003e Faulty downstream data blocks readiness monitors and causes false catalyst efficiency faults.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Direct-Fit Oxygen Sensors Solution\u003c\/h3\u003e\u003cp\u003eBuilt to replace OEM numbers \u003cstrong\u003e250-25135\u003c\/strong\u003e (\u003cstrong\u003e25025135\u003c\/strong\u003e) and \u003cstrong\u003e250-241226\u003c\/strong\u003e (\u003cstrong\u003e250241226\u003c\/strong\u003e), this matched kit pairs fast-light-off zirconia sensing elements with stainless-steel shields. Laser-welded housings resist exhaust condensation shock, while factory-length harnesses and weather-sealed connectors plug directly into the \u003cstrong\u003eCD4\u003c\/strong\u003e loom. Replacing both sensors together restores balanced air-fuel feedback and catalyst monitoring without cutting or splicing.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 Upstream Oxygen Sensor (Bank 1 Sensor 1)\u003c\/li\u003e\n\u003cli\u003e1 Downstream Oxygen Sensor (Bank 1 Sensor 2)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\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;\"\u003e2017-2020 Ford Fusion\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;\"\u003e2.5L Duratec I4 (Gasoline) \/ CD4\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;\"\u003eEmissions \u0026amp; Substrate\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eDirect-Fit Upstream \u0026amp; Downstream \/ Zirconia Ceramic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eInstallation Type\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eDirect Bolt-On OEM Replacement (No Cutting or Welding)\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;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e250-25135, 25025135, 250-241226, 250241226\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e2017-2020 Ford Fusion — 2.5L Gas I4 (1 Upstream Bank 1 Sensor 1 \u0026amp; 1 Downstream Bank 1 Sensor 2)\u003c\/li\u003e\n\u003cli\u003eExclusions: Does NOT fit Hybrid models; 2013-2016 models are not covered in this listing.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\u003ch4\u003eDoes this fit the CD4 Fusion?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e This is a direct fit for the 2017-2020 Ford Fusion equipped with the \u003cstrong\u003e2.5L Duratec I4\u003c\/strong\u003e gasoline engine. \u003cstrong\u003eExcludes Hybrid models and 2013-2016 applications; confirm engine before ordering.\u003c\/strong\u003e\u003c\/p\u003e\u003ch4\u003eWill this clear P0135, P0141, or P0133 codes, and are both sensors included?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Replacing failed sensors resolves \u003cstrong\u003eP0133\u003c\/strong\u003e, \u003cstrong\u003eP0135\u003c\/strong\u003e, and \u003cstrong\u003eP0141\u003c\/strong\u003e faults after a completed drive cycle, and both Bank 1 Sensor 1 and Bank 1 Sensor 2 are included.\u003c\/p\u003e\u003ch4\u003eAre factory connectors included for direct installation?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Both sensors include OEM-style plug-and-play connectors requiring zero splicing; inspect and chase M18x1.5 exhaust bung threads before torquing sensors to spec.\u003c\/p\u003e\u003ch3\u003eThe Ford Precision Standard\u003c\/h3\u003e\u003cp\u003eRestoring closed-loop fueling on your \u003cstrong\u003eCD4\u003c\/strong\u003e Fusion keeps the \u003cstrong\u003e2.5L Duratec I4\u003c\/strong\u003e operating at factory stoichiometry and emissions compliance. Precision connectors and thermal durability ensure reliable, CEL-free operation.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68119457169656,"sku":"DS-EEUT5KE0O","price":78.95,"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-fusion-2017-2020-2-5l-1.jpg?v=1794722106","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-ford-fusion-2017-2020-2-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}