{"product_id":"o2-oxygen-sensor-upstream-downstream-for-infiniti-g35-fx35-2003-2004-3-5l","title":"O2 Oxygen Sensor Upstream Downstream for Infiniti G35 FX35 (2003-2004) 3.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Upstream \u0026amp; Downstream O2 Sensor Kit for 2003-2004 Infiniti G35,FX35 (V35, S50)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This 4-piece O2 sensor kit monitors exhaust oxygen concentration and catalyst efficiency on 2003-2004 Infiniti G35 (\u003cstrong\u003eV35\u003c\/strong\u003e) and FX35 (\u003cstrong\u003eS50\u003c\/strong\u003e) \u003cstrong\u003eVQ35DE 3.5L\u003c\/strong\u003e models.\u003c\/p\u003e\u003ch3\u003eThe Stock Infiniti G35,FX35 Oxygen Sensor Failure\u003c\/h3\u003e\u003cp\u003eOn aging \u003cstrong\u003eV35\u003c\/strong\u003e and \u003cstrong\u003eS50\u003c\/strong\u003e platforms equipped with the \u003cstrong\u003eVQ35DE 3.5L V6\u003c\/strong\u003e, OEM oxygen sensors fail from thermal fatigue, internal heater burnout, and zirconia contamination. As sensing elements degrade, voltage switching slows down, skewing fuel trims across Bank 1 and Bank 2. Faulty heater circuits or slow response trigger \u003cstrong\u003eP0130\u003c\/strong\u003e, \u003cstrong\u003eP0150\u003c\/strong\u003e, \u003cstrong\u003eP0031\u003c\/strong\u003e, and \u003cstrong\u003eP0051\u003c\/strong\u003e codes, forcing rich open-loop operation and reduced fuel economy.\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 \u0026amp; DTCs:\u003c\/strong\u003e Triggers \u003cstrong\u003eP0130\u003c\/strong\u003e, \u003cstrong\u003eP0150\u003c\/strong\u003e, \u003cstrong\u003eP0138\u003c\/strong\u003e, \u003cstrong\u003eP0158\u003c\/strong\u003e, or \u003cstrong\u003eP0031\/P0051\u003c\/strong\u003e when voltage stalls or heater circuits open.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRich Exhaust \u0026amp; Rough Idle:\u003c\/strong\u003e Delayed sensor switching forces overly rich fuel compensation, fouling spark plugs.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFailed Emissions:\u003c\/strong\u003e Inaccurate downstream catalyst readings trigger \u003cstrong\u003eP0420\/P0430\u003c\/strong\u003e codes and drop MPG.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Direct-Fit Zirconia O2 Sensor Solution\u003c\/h3\u003e\u003cp\u003eReplacing all four sensors as a matched set restores balanced Bank 1 and Bank 2 closed-loop fuel control across upstream and downstream positions. Each direct-fit sensor uses a fast-acting planar zirconia element, laser-welded stainless housing, and PTFE-insulated wiring to resist exhaust heat soak and moisture. Factory-spec OEM connectors install directly into stock \u003cstrong\u003eV35\u003c\/strong\u003e and \u003cstrong\u003eS50\u003c\/strong\u003e bungs with zero splicing, replacing \u003cstrong\u003e234-4302\u003c\/strong\u003e, \u003cstrong\u003e234-4308\u003c\/strong\u003e, \u003cstrong\u003e234-4312\u003c\/strong\u003e, and \u003cstrong\u003e1A250-24403\u003c\/strong\u003e.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e2 Upstream Oxygen Sensors\u003c\/li\u003e\n\u003cli\u003e2 Downstream Oxygen Sensors\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;\"\u003e2003-2004 Infiniti G35,FX35\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;\"\u003eVQ35DE 3.5L V6 \/ V35, S50\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;\"\u003eHeated Zirconia \/ 4-Wire Direct-Fit\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;\"\u003e234-4302, 234-4308, 234-4312, 1A250-24403\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eInfiniti G35 2003-2004 3.5L (\u003cstrong\u003eV35\u003c\/strong\u003e)\u003c\/li\u003e\n\u003cli\u003eInfiniti FX35 2003-2004 3.5L (\u003cstrong\u003eS50\u003c\/strong\u003e)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\u003ch4\u003eDoes this fit the V35\/S50 G35,FX35?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e This is a direct fit for 2003-2004 Infiniti G35 (\u003cstrong\u003eV35\u003c\/strong\u003e) and FX35 (\u003cstrong\u003eS50\u003c\/strong\u003e) models equipped with the \u003cstrong\u003eVQ35DE 3.5L V6\u003c\/strong\u003e engine. \u003cstrong\u003eExcludes 2005+ models and FX45 4.5L V8 trims; confirm engine before ordering.\u003c\/strong\u003e\u003c\/p\u003e\u003ch4\u003eWill this clear O2 and heater circuit codes?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Replacing all four sensors resolves slow-switching and heater circuit faults like \u003cstrong\u003eP0031\u003c\/strong\u003e, \u003cstrong\u003eP0051\u003c\/strong\u003e, \u003cstrong\u003eP0130\u003c\/strong\u003e, and \u003cstrong\u003eP0150\u003c\/strong\u003e when exhaust leaks and harness damage are absent.\u003c\/p\u003e\u003ch4\u003eIs cutting or splicing required for installation?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eNo.\u003c\/strong\u003e Factory-spec OEM connectors plug straight into stock harnesses; treat seized bungs with penetrant beforehand and torque using an O2 sensor socket.\u003c\/p\u003e\u003ch3\u003eThe Infiniti Precision Standard\u003c\/h3\u003e\u003cp\u003eBuilt for \u003cstrong\u003eVQ35DE\u003c\/strong\u003e platforms, this 4-piece sensor kit restores factory ECM precision, crisp throttle response, and CEL-free emissions compliance across both exhaust banks.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68109340836088,"sku":"DS-E58FL0R67","price":92.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-infiniti-g35-fx35-2003-2004-3-5l-1.jpg?v=1794687201","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-infiniti-g35-fx35-2003-2004-3-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}