{"product_id":"o2-oxygen-sensor-upstream-downstream-for-scion-xb-2008-2015-2-4l","title":"O2 Oxygen Sensor Upstream Downstream for Scion xB (2008-2015) 2.4L","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 2008-2015 Scion xB (AZE151)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This matched upstream and downstream oxygen sensor kit monitors pre- and post-catalyst exhaust oxygen content on the 2008-2015 Scion xB (\u003cstrong\u003eAZE151\u003c\/strong\u003e) with the \u003cstrong\u003e2AZ-FE 2.4L\u003c\/strong\u003e engine to regulate closed-loop fuel trim and verify converter efficiency.\u003c\/p\u003e\u003ch3\u003eThe Stock Scion xB Oxygen Sensor Failure\u003c\/h3\u003e\u003cp\u003eOn the \u003cstrong\u003eAZE151\u003c\/strong\u003e Scion xB powered by the \u003cstrong\u003e2AZ-FE 2.4L\u003c\/strong\u003e, factory oxygen sensors endure severe thermal cycling, carbon fouling, and oil-ash contamination common to higher-mileage engines. Over time, the internal zirconia ceramic element fractures or slows down, while the integrated heater circuit burns out under continuous electrical load. This causes sluggish millivolt switching and skewed air\/fuel ratio feedback, triggering \u003cstrong\u003eP0138\u003c\/strong\u003e, \u003cstrong\u003eP0136\u003c\/strong\u003e, \u003cstrong\u003eP0031\u003c\/strong\u003e, or \u003cstrong\u003eP2195\u003c\/strong\u003e fault codes and forcing open-loop rich fueling.\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 heater circuit or slow-response codes like \u003cstrong\u003eP0031\u003c\/strong\u003e, \u003cstrong\u003eP0136\u003c\/strong\u003e, \u003cstrong\u003eP0138\u003c\/strong\u003e, or false \u003cstrong\u003eP0420\u003c\/strong\u003e catalyst alerts.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRich Running \u0026amp; Fouling:\u003c\/strong\u003e Sluggish upstream voltage causes heavy exhaust soot, rough idle, and premature spark plug wear.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFailed Emissions \u0026amp; Economy Drop:\u003c\/strong\u003e Open-loop ECM fueling reduces fuel mileage and prevents OBD-II emissions readiness monitors from setting.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Direct-Fit Heated Zirconia Oxygen Sensor Solution\u003c\/h3\u003e\u003cp\u003eReplacing both sensors as a matched set restores rapid closed-loop ECM communication across the entire exhaust stream of the \u003cstrong\u003e2AZ-FE 2.4L\u003c\/strong\u003e. Built with laser-welded stainless steel housings and dual-shielded planar ceramic sensing elements, these direct-fit units resist thermal shock, moisture intrusion, and exhaust-gas poisoning. Factory-length heat-sleeved harnesses and OEM-style weatherproof connectors eliminate wire splicing, ensuring accurate air\/fuel telemetry matching OE reference \u003cstrong\u003e8946712070\u003c\/strong\u003e.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1x Upstream Oxygen Sensor (Direct-Fit)\u003c\/li\u003e\n\u003cli\u003e1x Downstream Oxygen Sensor (Direct-Fit)\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;\"\u003e2008-2015 Scion 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;\"\u003e2AZ-FE 2.4L \/ AZE151\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;\"\u003eSensor Architecture\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e4-Wire Heated Planar Zirconia (Upstream \u0026amp; Downstream)\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 (Plug-and-Play Harness)\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;\"\u003e8946712070\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e2008-2015 Scion xB 2.4L (2AZ-FE, 2-Sensor System: 1 Upstream, 1 Downstream)\u003c\/li\u003e\n\u003cli\u003eExcludes 2004-2006 Scion xA \/ xB 1.5L (1NZ-FE, different generation and engine)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\u003ch4\u003eDoes this fit the AZE151 xB?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e This is a direct fit for the 2008-2015 Scion xB equipped with the \u003cstrong\u003e2AZ-FE 2.4L\u003c\/strong\u003e engine. \u003cstrong\u003eIt does not fit 2004-2006 Scion xA or xB models equipped with the 1.5L engine.\u003c\/strong\u003e\u003c\/p\u003e\u003ch4\u003eWill this clear P0136, P0138, or P0031 codes without splicing wires?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Factory-style connectors plug directly into the OEM harness to resolve heater circuit and slow-response faults like \u003cstrong\u003eP0031\u003c\/strong\u003e, \u003cstrong\u003eP0136\u003c\/strong\u003e, and \u003cstrong\u003eP0138\u003c\/strong\u003e once codes are cleared.\u003c\/p\u003e\u003ch4\u003eAre both upstream and downstream sensors included for installation?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e This kit includes 1 upstream and 1 downstream oxygen sensor; chase dirty exhaust bung threads if corroded and torque both sensors to factory specification.\u003c\/p\u003e\u003ch3\u003eThe Scion Precision Standard\u003c\/h3\u003e\u003cp\u003eEngineered for accurate air\/fuel stoichiometry, crisp throttle response, and CEL-free emissions readiness on your \u003cstrong\u003eAZE151\u003c\/strong\u003e. Restore factory closed-loop \u003cstrong\u003e2AZ-FE\u003c\/strong\u003e fuel control and reliable daily drivability.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68119244275960,"sku":"DS-ELXZZ403D","price":47.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-scion-xb-2008-2015-2-4l-1.jpg?v=1794717936","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-scion-xb-2008-2015-2-4l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}