{"product_id":"oxygen-sensors-for-scion-xa-xb-2004-2006-1-5l-upstream-downstream","title":"Oxygen Sensors for Scion xA xB (2004-2006) 1.5L Upstream \u0026 Downstream","description":"\u003ch2\u003eDirect-Fit Oxygen Sensor Kit for 2004-2006 Scion xA, xB\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Oxygen Sensor Kit replaces degraded upstream and downstream lambda sensors on the 2004-2006 Scion xA and xB to restore proper air-fuel closed-loop feedback, correct fuel trims, and eliminate catalyst efficiency trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Scion xA, xB Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eWith age and thermal cycling, the factory zirconium dioxide sensing elements in the \u003cstrong\u003eNCP31\u003c\/strong\u003e and \u003cstrong\u003eNCP61\u003c\/strong\u003e exhaust tracts suffer from chemical poisoning, silicone contamination, and soot coating. Over 100,000 miles, this degradation dampens sensor voltage switching response times between rich (0.9V) and lean (0.1V). The factory \u003cstrong\u003e1NZ-FE\u003c\/strong\u003e ECU responds by defaulting to rich safe-mode fuel mapping, causing poor combustion efficiency, unburned hydrocarbon buildup, rough idle, failing emissions inspections, and recurring diagnostic trouble codes such as P0135, P0141, or P0420.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis 2-piece replacement kit features precision planar sensing elements housed within dual-layer protective 304 stainless steel heat shielding. The internal ceramic electrolyte provides high thermal shock resistance and rapid heater circuit activation to achieve operating temperature (600°F) in seconds. Integrated high-temperature PTFE-insulated wiring harnesses, silicone rubber outer weather seals, and OE-pinned direct-fit locking connectors eliminate the signal resistance and failure points common with universal wire-splicing repairs. Calibrated resistance values deliver precise millivolt feedback to restore factory stoichiometric AFR targets.\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;\"\u003e2004-2006 Scion xA, xB\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;\"\u003e1NZ-FE \/ NCP31, NCP61\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;\"\u003e108 hp \/ 105 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\u003e2004-2006 Scion xA Base Hatchback 5-Door 1.5L L4 (1NZ-FE \/ NCP61)\u003c\/li\u003e\n  \u003cli\u003e2004-2006 Scion xB Base Wagon 5-Door 1.5L L4 (1NZ-FE \/ NCP31)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the NCP31 and NCP61 xA, xB?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2004-2006 Scion xA and xB equipped with the 1.5L \u003cstrong\u003e1NZ-FE\u003c\/strong\u003e engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDo I need to calibrate or tune the ECU after installing these sensors?\u003c\/strong\u003e\u003cbr\u003e No tuning is required; clear existing OBD-II diagnostic fault codes and let the ECU complete a drive cycle to relearn fuel trims.\u003c\/p\u003e\n\n\u003ch3\u003eThe Scion JDM Reliability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to withstand continuous vibration and thermal cycling, this oxygen sensor set restores peak fuel economy, crisp throttle response, and pristine emissions compliance to your high-revving 1NZ-FE powertrain.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50511124693240,"sku":"DS-ECQQZV1AX","price":79.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/oxygen-sensors-for-scion-xa-xb-2004-2006-1-5l-upstream-downstream-1.jpg?v=1789410436","url":"https:\/\/performancechiptuning.com\/fr\/products\/oxygen-sensors-for-scion-xa-xb-2004-2006-1-5l-upstream-downstream","provider":"Performance Chip Tuning","version":"1.0","type":"link"}