{"product_id":"oxygen-sensors-for-toyota-highlander-2001-2003-3-0l-upstream","title":"Oxygen Sensors for Toyota Highlander (2001-2003) 3.0L Upstream","description":"\u003ch2\u003eDirect-Fit Upstream Air-Fuel Ratio Oxygen Sensor for 2001-2003 Toyota Highlander\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The upstream oxygen sensor monitors pre-catalytic exhaust gas stoichiometry on the 2001-2003 Toyota Highlander to restore closed-loop fuel trim precision and eliminate rough idle conditions caused by degraded factory lambda feedback.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Toyota Highlander Lambda Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eThe factory upstream sensors on the \u003cstrong\u003e1MZ-FE\u003c\/strong\u003e engine endure severe thermal cycling and sustained exposure to exhaust combustion byproducts. Over extended mileage, silicates and phosphorus deposits contaminate the porous ceramic zirconia electrolyte, blunting the sensor's switching response time. In the first-generation \u003cstrong\u003eXU20\u003c\/strong\u003e platform, an aged upstream sensor leads to sluggish voltage swings, forcing the ECU into conservative, over-rich fuel maps. This causes unburned hydrocarbons, fouled spark plugs, impaired catalytic converter efficiency, decreased fuel economy, and persistent diagnostic trouble codes such as P0171 or P1135.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered as a plug-and-play replacement, this sensor incorporates a rapid-response planar zirconia element shielded by a double-laser-welded stainless steel casing. The high-grade internal ceramic heater circuit reaches optimal operating temperature rapidly, expediting closed-loop ECM operation during cold starts to curb tailpipe emissions and carbon buildup. Precision-cut factory-matched OE connectors ensure solid terminal engagement without wire splicing, while pre-treated high-temperature anti-seize threads prevent galling in cast exhaust manifolds.\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;\"\u003e2001-2003 Toyota Highlander (Upstream Position)\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\u003e1MZ-FE\u003c\/strong\u003e 3.0L V6 \/ \u003cstrong\u003eXU20\u003c\/strong\u003e (MCU20\/MCU25)\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;\"\u003e220 hp \/ 222 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;\"\u003e89467-48011 \/ N\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2001 Toyota Highlander Base 3.0L V6 Gas (FWD \/ AWD) - Upstream\u003c\/li\u003e\n  \u003cli\u003e2001 Toyota Highlander Limited 3.0L V6 Gas (FWD \/ AWD) - Upstream\u003c\/li\u003e\n  \u003cli\u003e2002 Toyota Highlander Base 3.0L V6 Gas (FWD \/ AWD) - Upstream\u003c\/li\u003e\n  \u003cli\u003e2002 Toyota Highlander Limited 3.0L V6 Gas (FWD \/ AWD) - Upstream\u003c\/li\u003e\n  \u003cli\u003e2003 Toyota Highlander Base 3.0L V6 Gas (FWD \/ AWD) - Upstream\u003c\/li\u003e\n  \u003cli\u003e2003 Toyota Highlander Limited 3.0L V6 Gas (FWD \/ AWD) - Upstream\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the XU20 Highlander?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2001-2003 Toyota Highlander equipped with the \u003cstrong\u003e1MZ-FE\u003c\/strong\u003e 3.0L V6 engine in the upstream exhaust manifold location.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this resolve lean condition DTCs like P1135 or P0171?\u003c\/strong\u003e\u003cbr\u003e Yes, replacing a worn or slow-reacting upstream sensor restores accurate air-fuel ratio signaling to the ECU, clearing persistent sensor-circuit and lean-trim codes once cycles complete.\u003c\/p\u003e\n\n\u003ch3\u003eThe Toyota Reliability Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt to handle sustained suburban commuting and high-mileage all-weather touring, this sensor restores the factory-grade fuel metering and emissions compliance essential to keeping your Japanese-engineered powertrain running cleanly and efficiently.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50511228371192,"sku":"DS-EZH3ZP1Y7","price":75.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/oxygen-sensors-for-toyota-highlander-2001-2003-3-0l-upstream-1.jpg?v=1789411661","url":"https:\/\/performancechiptuning.com\/es\/products\/oxygen-sensors-for-toyota-highlander-2001-2003-3-0l-upstream","provider":"Performance Chip Tuning","version":"1.0","type":"link"}