{"product_id":"o2-oxygen-sensor-upstream-downstream-for-toyota-highlander-2008-2010-3-5l","title":"O2 Oxygen Sensor Upstream Downstream for Toyota Highlander (2008-2010) 3.5L","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 2008-2010 Toyota Highlander (XU40)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This matched 4-piece upstream and downstream oxygen sensor kit monitors pre- and post-catalyst exhaust oxygen levels on the 2008-2010 Toyota Highlander (\u003cstrong\u003eXU40\u003c\/strong\u003e) \u003cstrong\u003e2GR-FE 3.5L V6\u003c\/strong\u003e to maintain closed-loop fuel trim precision and catalytic efficiency.\u003c\/p\u003e\u003ch3\u003eThe Stock Toyota Highlander Sensor Degradation\u003c\/h3\u003e\u003cp\u003eOn the \u003cstrong\u003eXU40\u003c\/strong\u003e chassis with the \u003cstrong\u003e2GR-FE 3.5L V6\u003c\/strong\u003e, factory oxygen sensors endure severe thermal cycling and exhaust soot buildup at the manifolds. Over high mileage, internal ceramic elements suffer micro-fractures while heater coils burn out from sustained heat soak. Sluggish voltage switching then skews ECU fuel trims and triggers fault codes including \u003cstrong\u003eP0031\u003c\/strong\u003e, \u003cstrong\u003eP0051\u003c\/strong\u003e, \u003cstrong\u003eP0138\u003c\/strong\u003e, or \u003cstrong\u003eP0420\/P0430\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 Stored heater or response faults like \u003cstrong\u003eP0031\u003c\/strong\u003e, \u003cstrong\u003eP0051\u003c\/strong\u003e, \u003cstrong\u003eP0138\u003c\/strong\u003e, or catalyst codes \u003cstrong\u003eP0420\/P0430\u003c\/strong\u003e from lazy sensor switching.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Trim Instability:\u003c\/strong\u003e Erratic air-fuel feedback forces rich or lean compensation, causing rough cold starts and throttle hesitation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEconomy \u0026amp; Emissions Loss:\u003c\/strong\u003e Stuck closed-loop trims increase fuel consumption and prevent OBD-II readiness monitors from setting.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Matched 4-Sensor Direct-Fit Solution\u003c\/h3\u003e\u003cp\u003eThis 4-piece kit replaces all upstream and downstream sensors simultaneously using stainless steel housings and double-layered shields engineered to resist moisture and thermal shock. Precision ceramic elements ensure rapid heater light-off and stable voltage output across the operating range. Interchanging with OEM numbers \u003cstrong\u003e234-9022\u003c\/strong\u003e, \u003cstrong\u003e234-9008\u003c\/strong\u003e, \u003cstrong\u003e234-4509\u003c\/strong\u003e, and \u003cstrong\u003e234-4149\u003c\/strong\u003e, each sensor features factory-length harnesses and weatherproof connectors for zero-splice installation.\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;\"\u003e2008-2010 Toyota Highlander\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;\"\u003e2GR-FE 3.5L V6 \/ XU40\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; Sensor Spec\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2 Upstream \u0026amp; 2 Downstream Direct-Fit Heated Ceramic Sensors\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;\"\u003e234-9022, 234-9008, 234-4509, 234-4149\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e2008-2010 Toyota Highlander 3.5L (Confirm engine before ordering)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\u003ch4\u003eDoes this fit the XU40 Highlander?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e This is a direct fit for the 2008-2010 Toyota Highlander equipped with the \u003cstrong\u003e2GR-FE 3.5L V6\u003c\/strong\u003e engine. \u003cstrong\u003eExcludes 2.7L 4-cylinder and 3.3L Hybrid models; confirm engine before ordering.\u003c\/strong\u003e\u003c\/p\u003e\u003ch4\u003eWill this clear P0031, P0138, or P0420\/P0430 codes?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes, when triggered by worn sensors.\u003c\/strong\u003e Replacing all four units (\u003cstrong\u003e234-9022\u003c\/strong\u003e, \u003cstrong\u003e234-9008\u003c\/strong\u003e, \u003cstrong\u003e234-4509\u003c\/strong\u003e, \u003cstrong\u003e234-4149\u003c\/strong\u003e) restores heater resistance and ECU feedback, though a damaged catalyst substrate still triggers \u003cstrong\u003eP0420\/P0430\u003c\/strong\u003e.\u003c\/p\u003e\u003ch4\u003eDo these sensors require wire splicing?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eNo.\u003c\/strong\u003e Each sensor features factory-style plug-and-play connectors and OEM-length harnesses; coat threads lightly with anti-seize only and torque to factory spec.\u003c\/p\u003e\u003ch3\u003eThe Toyota Precision Standard\u003c\/h3\u003e\u003cp\u003eBuilt for the \u003cstrong\u003eXU40\u003c\/strong\u003e platform, this matched 4-sensor kit restores factory closed-loop ECU precision and CEL-free emissions compliance. Clean Bank 1 and Bank 2 lambda telemetry ensures consistent fuel economy and reliable catalytic monitoring.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68096717259000,"sku":"DS-EWIQ2W7VN","price":104.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-toyota-highlander-2008-2010-3-5l-1.jpg?v=1794640827","url":"https:\/\/performancechiptuning.com\/fr\/products\/o2-oxygen-sensor-upstream-downstream-for-toyota-highlander-2008-2010-3-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}