{"product_id":"denso-o2-oxygen-sensor-234-4168-4-wire-heated-13-78-harness-for-lexus-scion-toyota","title":"Denso O2 Oxygen Sensor 234-4168 — 4‑Wire Heated, 13.78\" Harness for Lexus\/Scion\/Toyota","description":"\u003cp\u003e\u003cstrong\u003eThe Denso 234-4168 is a direct-replacement narrow-band oxygen (O2) sensor with a 4-wire, 13.78-inch harness built to restore accurate air-fuel monitoring for compatible Lexus, Scion, and Toyota models.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis replacement O2 sensor is engineered to meet or exceed original-equipment standards, delivering a precision fit and long-term durability. Denso designs these sensors with an aluminum oxide trap layer to shield the sensing element from contamination, helping maintain reliable readings and supporting the vehicle’s engine management system. The 234-4168 fits several popular models and years, making it a practical service part for repairs or routine maintenance.\u003c\/p\u003e\n\n\u003ch3\u003eWill this sensor fit my vehicle?\u003c\/h3\u003e\n\u003cp\u003eCheck fitment against the listed makes, models, and years to confirm compatibility before ordering. The 234-4168 is specified for certain Lexus, Scion, and Toyota vehicles and includes a 13.78-inch wiring harness to match OE routing and connector placement.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible vehicles: Lexus RX330 (2004–2006)\u003c\/li\u003e\n  \u003cli\u003eScion fitment: iQ (2012–2015), xB (2008–2015)\u003c\/li\u003e\n  \u003cli\u003eToyota vehicles: Highlander (2004–2007), Sienna (2004–2006), Venza (2009–2014)\u003c\/li\u003e\n  \u003cli\u003e4-wire configuration for heated-sensor applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this O2 sensor help engine performance and fuel economy?\u003c\/h3\u003e\n\u003cp\u003eThe sensor measures exhaust oxygen levels so the engine control unit can adjust fuel delivery for a proper air-fuel ratio. By returning accurate signals, the 234-4168 supports smoother idle, consistent throttle response, and optimized fuel use without altering any engine components.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eProvides precise oxygen readings to the ECU\u003c\/li\u003e\n  \u003cli\u003eHelps reduce rich or lean running conditions\u003c\/li\u003e\n  \u003cli\u003eSupports fuel trim adjustments for better economy\u003c\/li\u003e\n  \u003cli\u003eMay help stabilize emissions-related systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat makes Denso sensors reliable compared with other replacements?\u003c\/h3\u003e\n\u003cp\u003eDenso builds to OE tolerances and tests sensors for performance and longevity. The aluminum oxide trap layer helps guard the ceramic sensing element against lead and silicone contaminants, which can otherwise degrade response over time.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePrecision-manufactured to match OE dimensions and connector pinouts\u003c\/li\u003e\n  \u003cli\u003eContaminant-protection layer extends sensor life\u003c\/li\u003e\n  \u003cli\u003eFactory-style harness length (13.78 in) for correct routing\u003c\/li\u003e\n  \u003cli\u003e4-wire heated design shortens warm-up time for accurate readings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow difficult is installation and what should I prepare?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward for someone with basic tools and mechanical experience, but access can vary by vehicle. Use an appropriate O2-sensor socket, verify connector compatibility, and follow torque specifications to avoid damage.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eRequired tools: O2-sensor socket, ratchet, anti-seize (if not pre-applied)\u003c\/li\u003e\n  \u003cli\u003eCheck wiring harness routing to prevent chafing\u003c\/li\u003e\n  \u003cli\u003eDisconnect the battery before working on electrical connectors\u003c\/li\u003e\n  \u003cli\u003eConfirm connector pins match your vehicle’s harness before final installation\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho this part is for: The Denso 234-4168 is intended for owners, technicians, and fleet service shops needing an OE-quality narrow-band oxygen sensor for the specified Lexus, Scion, and Toyota models. It suits anyone replacing a failed O2 sensor, addressing drivability or emissions-related fault codes, or performing scheduled exhaust-system maintenance. Choose this part when you want a direct-fit, factory-standard sensor designed for dependable operation and long-term service life.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is the Denso 234-4168 a direct replacement?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It is manufactured to OE standards with the correct 4-wire connector and 13.78-inch harness for a first-time fit on listed vehicles.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Can I install this sensor myself?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: If you have basic tools and experience, yes. Use an O2-sensor socket, verify connector pinout, and follow torque recommendations.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Denso","offers":[{"title":"Default Title","offer_id":48080121594014,"sku":"B000IYBF6Q","price":108.4,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/denso-234-4168-front-view.jpg?v=1785779085","url":"https:\/\/northtrailauto.ca\/products\/denso-o2-oxygen-sensor-234-4168-4-wire-heated-13-78-harness-for-lexus-scion-toyota","provider":"North Trail Auto","version":"1.0","type":"link"}