{"product_id":"a-premium-downstream-o2-oxygen-sensor-for-nissan-infiniti-single-4-wire-heated","title":"A-Premium Downstream O2 Oxygen Sensor for Nissan \u0026 Infiniti — Single 4-Wire Heated","description":"\u003cp\u003e\u003cstrong\u003eThe A-Premium Downstream O2 Oxygen Sensor is a direct-fit, heated 4-wire replacement sensor designed to restore accurate post-catalyst oxygen readings on select Nissan and Infiniti V6\/V8 models.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis aftermarket downstream (post-catalytic) oxygen sensor from A-Premium is engineered to match OE fitment and electrical specifications for a range of Nissan and Infiniti vehicles from the early to late 2000s. It measures residual oxygen in exhaust gases after the catalytic converter so the engine control unit can fine-tune fuel trim and emissions strategies. Sold as a single threaded sensor with a male connector, it arrives in protective box packaging and includes a one-year unlimited-mileage warranty from A-Premium.\u003c\/p\u003e\n\n\u003ch3\u003eWhich vehicles will this A-Premium downstream O2 sensor fit?\u003c\/h3\u003e\n\u003cp\u003eThis sensor is designed for specific Nissan and Infiniti platforms—check the exact model years and engine sizes before ordering. It supports both left\/right and front\/rear downstream positions depending on the vehicle application.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNissan Altima (2005–2006) V6 3.5L; 350Z (2003–2006) V6 3.5L\u003c\/li\u003e\n  \u003cli\u003eInfiniti FX35 (2003–2006) V6 3.5L; FX45 (2003–2008) V8 4.5L\u003c\/li\u003e\n  \u003cli\u003eInfiniti G35 (2003–2006) V6 3.5L; M35 (2006) V6 3.5L; M45 (2003–2004, 2006–2010) V8 4.5L\u003c\/li\u003e\n  \u003cli\u003eNissan Maxima (2004–2007) V6 3.5L; Quest (2004–2009) V6 3.5L; Q45 (2002–2006) V8 4.5L\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this downstream sensor compare to the original equipment part?\u003c\/h3\u003e\n\u003cp\u003eThe A-Premium sensor mirrors the OE configuration with a heated element and a threaded mount for straightforward bolt-in replacement. It uses a four-wire harness and a male connector to match the factory electrical interface, which simplifies installation and helps preserve signal integrity.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHeated sensor design for quicker operation at low temperatures\u003c\/li\u003e\n  \u003cli\u003e4-wire configuration for heater power and accurate signal return\u003c\/li\u003e\n  \u003cli\u003eThreaded mounting to match factory exhaust ports and gaskets\u003c\/li\u003e\n  \u003cli\u003eMale connector keyed to OE wiring harnesses for plug-and-play fit\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat technical details and reference numbers should I check before buying?\u003c\/h3\u003e\n\u003cp\u003eVerify part references and connector style against your vehicle’s existing sensor. A-Premium lists multiple equivalent reference numbers to help cross-reference with OE and aftermarket catalogs.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReference numbers: 250-24403, 25024403, 250-24448, 25024448\u003c\/li\u003e\n  \u003cli\u003eAdditional codes: 226A08J010, 226A1AR210, 226A1-8U700, 226A18U700\u003c\/li\u003e\n  \u003cli\u003eSpecification summary: 4 wires, heated sensor, threaded mount, male connector\u003c\/li\u003e\n  \u003cli\u003eSold as: 1x oxygen sensor in boxed packaging\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat warranty and support does A-Premium provide?\u003c\/h3\u003e\n\u003cp\u003eA-Premium includes a one-year, unlimited-mileage guarantee covering manufacturing defects, giving you replacement or refund options if the sensor fails under normal use during that period. Customer support resources and fitment guides are available to assist with selection and installation questions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOne-year unlimited-mileage warranty\u003c\/li\u003e\n  \u003cli\u003eBoxed packaging for protection in transit\u003c\/li\u003e\n  \u003cli\u003eCustomer support for fitment and installation inquiries\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The A-Premium Downstream O2 Oxygen Sensor is aimed at owners and technicians working on compatible Nissan and Infiniti models who need a cost-effective, OE-style downstream replacement. If you’re restoring exhaust system performance, troubleshooting a downstream oxygen sensor code, or replacing a failed heater circuit, this direct-fit 4-wire sensor offers straightforward installation and an A-Premium warranty for peace of mind.\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 this oxygen sensor heated and how many wires does it have?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the A-Premium downstream sensor is a heated type with four wires for heater and signal connections.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this sensor fit my Infiniti FX35 or Nissan Maxima?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It fits FX35 (2003–2006) and Maxima (2004–2007) V6 3.5L models; confirm position (left\/right or front\/rear) for correct fit.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"A-Premium","offers":[{"title":"Default Title","offer_id":48086758654110,"sku":"B07CRHPXWP","price":60.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/a-premium-downstream-sensor-front-view_a5c4b9a1-bdcc-4945-950a-e1d9f4fd5cd5.jpg?v=1785903739","url":"https:\/\/northtrailauto.ca\/products\/a-premium-downstream-o2-oxygen-sensor-for-nissan-infiniti-single-4-wire-heated","provider":"North Trail Auto","version":"1.0","type":"link"}