{"product_id":"oxygen-sensors-for-infiniti-fx35-g35-2003-2006-3-5l-downstream","title":"Oxygen Sensors for Infiniti FX35 G35 (2003-2006) 3.5L Downstream","description":"\u003ch2\u003eDirect-Fit Downstream Oxygen Sensor Set for 2003-2006 Infiniti FX35, G35\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Downstream Oxygen Sensor Set monitors catalytic converter efficiency and post-combustion exhaust gas on the 2003-2006 Infiniti FX35 and G35 to maintain precise closed-loop ECM fuel trimming and prevent false emissions-related trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Infiniti FX35, G35 Sensor Degradation Failure Points\u003c\/h3\u003e\n\u003cp\u003eFactory secondary oxygen sensors on high-mileage \u003cstrong\u003eVQ35DE\u003c\/strong\u003e engines suffer from prolonged exposure to thermal cycling, exhaust gas condensation, and carbon build-up. Over time, the internal ceramic electrolyte element loses its sensitivity, and the internal heater circuit deteriorates. This degradation leads to sluggish voltage response, signal clipping, and recurrent check engine lights (such as P0420, P0430, P0138, or P0158). Worn downstream sensors also prevent the engine control module from accurately verifying catalyst efficiency, skewing long-term trim calculations and causing rough idle conditions.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis 2-piece downstream sensor set is engineered to match factory electrical resistance and output voltage parameters precisely. Built with high-grade 304 stainless steel housings and porous PTFE filters, each sensor resists thermal shock, road debris, and corrosive exhaust contaminants. Fast-activating planar heater circuits rapidly reach operating temperature to establish closed-loop monitoring immediately after cold starts. Pre-terminated, OEM-style weather-pack harness connectors and pre-treated threads ensure straightforward installation without splicing or harness repinning.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\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;\"\u003e2003-2006 Infiniti FX35, G35\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\u003eVQ35DE\u003c\/strong\u003e \/ \u003cstrong\u003eS50\u003c\/strong\u003e, \u003cstrong\u003eV35\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;\"\u003e260–298 hp \/ 250–270 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;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2003-2006 Infiniti FX35 Base Sport Utility 3.5L V6 (S50) – Downstream (Bank 1 \u0026amp; Bank 2 Sensor 2)\u003c\/li\u003e\n  \u003cli\u003e2003-2006 Infiniti G35 Sedan 3.5L V6 (V35) – Downstream (Bank 1 \u0026amp; Bank 2 Sensor 2)\u003c\/li\u003e\n  \u003cli\u003e2003-2006 Infiniti G35 Coupe 3.5L V6 (V35) – Downstream (Bank 1 \u0026amp; Bank 2 Sensor 2)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the V35 and S50 FX35, G35?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2003-2006 Infiniti FX35 and G35 equipped with the \u003cstrong\u003eVQ35DE\u003c\/strong\u003e 3.5L engine in the downstream (post-catalytic converter) positions.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan these downstream sensors be installed in the upstream manifold positions?\u003c\/strong\u003e\u003cbr\u003e No, downstream units are specifically calibrated for post-catalytic monitoring and utilize application-specific lead lengths and connectors distinct from the upstream air-fuel ratio sensors.\u003c\/p\u003e\n\n\u003ch3\u003eThe Infiniti Performance Standard\u003c\/h3\u003e\n\u003cp\u003eDesigned to maintain the refined power and crisp throttle response expected of the Nissan\/Infiniti VQ platform, these sensors withstand sustained high-RPM operation and high exhaust temperatures without dropping signal continuity or throwing false emissions flags.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50511196553464,"sku":"DS-EM0PYAUC0","price":79.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/oxygen-sensors-for-infiniti-fx35-g35-2003-2006-3-5l-downstream-1.jpg?v=1789411121","url":"https:\/\/performancechiptuning.com\/es\/products\/oxygen-sensors-for-infiniti-fx35-g35-2003-2006-3-5l-downstream","provider":"Performance Chip Tuning","version":"1.0","type":"link"}