{"product_id":"o2-oxygen-sensor-upstream-downstream-for-infiniti-fx35-m35-2007-2008-3-5l","title":"O2 Oxygen Sensor Upstream Downstream for Infiniti FX35 M35 (2007-2008) 3.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit O2 Oxygen Sensor Kit for 2007-2008 Infiniti FX35,M35 (S50\/Y50)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This 4-piece upstream and downstream oxygen sensor kit monitors exhaust air-fuel ratios and converter efficiency on 2007-2008 Infiniti FX35 (\u003cstrong\u003eS50\u003c\/strong\u003e) and M35 (\u003cstrong\u003eY50\u003c\/strong\u003e) \u003cstrong\u003eVQ35DE 3.5L V6\u003c\/strong\u003e models.\u003c\/p\u003e\u003ch3\u003eThe Stock Infiniti FX35,M35 Sensor Failure\u003c\/h3\u003e\u003cp\u003eOn high-mileage \u003cstrong\u003eS50\u003c\/strong\u003e and \u003cstrong\u003eY50\u003c\/strong\u003e chassis models equipped with the \u003cstrong\u003eVQ35DE 3.5L V6\u003c\/strong\u003e, extreme exhaust heat soak and thermal cycling degrade factory zirconia ceramic elements and internal heater circuits. Carbon soot and oil blow-by foul upstream wideband tips, causing sluggish voltage switching and skewed fuel trims. Failing downstream heaters trigger false converter faults and force rich open-loop operation, accelerating catalytic degradation.\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\u003eP0031\/P0051\u003c\/strong\u003e (heater circuit), \u003cstrong\u003eP2A00\/P2A03\u003c\/strong\u003e (A\/F range), and \u003cstrong\u003eP0138\/P0158\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSluggish Closed-Loop Response:\u003c\/strong\u003e Delayed voltage transitions cause rough idle, hesitation, and erratic fuel trim corrections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoor Fuel Economy \u0026amp; Emissions Failure:\u003c\/strong\u003e Rich fail-safe fueling fouls spark plugs and fails smog tests.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Direct-Fit Ceramic Oxygen Sensor Solution\u003c\/h3\u003e\u003cp\u003eReplacing all four positions as a matched set restores Bank 1 and Bank 2 telemetry using OE-equivalent \u003cstrong\u003e234-5061\u003c\/strong\u003e upstream and \u003cstrong\u003e234-4380\u003c\/strong\u003e downstream sensors. Each unit features laser-welded stainless housings, porous PTFE membranes, and thermal-shock-resistant zirconia ceramic elements for rapid light-off. Factory-length shielded harnesses and keyed OEM-style connectors allow plug-and-play installation into stock exhaust bungs without splicing for reliable long-term output.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e2 Upstream Oxygen Sensors (\u003cstrong\u003e234-5061\u003c\/strong\u003e)\u003c\/li\u003e\n\u003cli\u003e2 Downstream Oxygen Sensors (\u003cstrong\u003e234-4380\u003c\/strong\u003e)\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;\"\u003e2007-2008 Infiniti FX35,M35\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 \/ S50, Y50\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;\"\u003eOBD-II Compliant \/ Zirconia Ceramic Sensing Element\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;\"\u003e234-5061, 234-4380\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e2007-2008 Infiniti FX35 3.5L (\u003cstrong\u003eS50\u003c\/strong\u003e Chassis)\u003c\/li\u003e\n\u003cli\u003e2007-2008 Infiniti M35 3.5L (\u003cstrong\u003eY50\u003c\/strong\u003e Chassis)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\u003ch4\u003eDoes this fit the S50\/Y50 FX35,M35?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Direct fit for 2007-2008 Infiniti FX35,M35 with the \u003cstrong\u003eVQ35DE 3.5L V6\u003c\/strong\u003e. \u003cstrong\u003eExcludes 4.5L V8 FX45\/M45 trims; confirm engine before ordering.\u003c\/strong\u003e\u003c\/p\u003e\u003ch4\u003eWill this clear P2A00, P0138, or P0031 codes?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Replacing failed sensors clears sensor-related \u003cstrong\u003eP2A00\/P2A03\u003c\/strong\u003e, \u003cstrong\u003eP0138\/P0158\u003c\/strong\u003e, and heater DTCs after a drive cycle, assuming no exhaust leaks exist.\u003c\/p\u003e\u003ch4\u003eAre connectors pre-terminated for direct installation?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e All four sensors feature OEM plugs; apply anti-seize to threads only and torque to factory spec.\u003c\/p\u003e\u003ch3\u003eThe Infiniti Precision Standard\u003c\/h3\u003e\u003cp\u003eBuilt for high-temperature VQ-series exhaust environments, this matched kit restores closed-loop fuel accuracy and emissions compliance. Expect CEL-free operation and balanced cylinder-bank telemetry.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68109359513848,"sku":"DS-EY8QU96OK","price":119.95,"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-fx35-m35-2007-2008-3-5l-1.jpg?v=1794687389","url":"https:\/\/performancechiptuning.com\/de\/products\/o2-oxygen-sensor-upstream-downstream-for-infiniti-fx35-m35-2007-2008-3-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}