{"product_id":"a-premium-downstream-o2-oxygen-sensor-compatible-with-nissan-infiniti-4-wire-heated-400mm-250-241255","title":"A-Premium Downstream O2 Oxygen Sensor Compatible with Nissan \u0026 Infiniti — 4‑Wire Heated, 400mm (250-241255)","description":"\u003cp\u003e\u003cstrong\u003eThe A-Premium downstream heated O2 oxygen sensor (part 250-241255) replaces the factory sensor to restore accurate post-catalytic converter exhaust readings for compatible Nissan and Infiniti models.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eDesigned as a direct-fit downstream (post-cat) replacement, this A-Premium oxygen sensor provides a four-wire, heated design with a 400 mm harness and threaded mount for straightforward installation. It is manufactured to meet common OEM fitment points for many Nissan and Infiniti vehicles produced between 2018 and 2024, and it ships in protective boxed packaging with a one-year unlimited-mileage warranty.\u003c\/p\u003e\n\n\u003ch3\u003eWhich vehicles is this oxygen sensor compatible with?\u003c\/h3\u003e\n\u003cp\u003eThis downstream sensor supports multiple Nissan and Infiniti applications across model years and engine types. Exact fit depends on position (rear\/front\/left\/right) and engine code—consult the listed fitment details or your VIN to confirm compatibility.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNissan Altima: 2019–2021 L4 2.0L (B1S2, KR20DDET); 2022–2024 L4 2.0L\/2.5L\u003c\/li\u003e\n  \u003cli\u003eNissan Kicks: 2018–2021 \u0026amp; 2022–2024 L4 1.6L (B1S2, HR16DE)\u003c\/li\u003e\n  \u003cli\u003eNissan Sentra: 2020–2024 L4 2.0L\u003c\/li\u003e\n  \u003cli\u003eNissan Versa\/Versa Note: various 2018–2024 L4 1.6L fitments (B1S2, HR16DE)\u003c\/li\u003e\n  \u003cli\u003eINFINITI QX50\/QX55: 2019–2024 L4 2.0L (B1S2)\u003c\/li\u003e\n  \u003cli\u003eNissan Pathfinder, TITAN, TITAN XD: specific downstream\/front\/rear or left\/right positions for 2020 models and later V6\/V8 engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the key technical specifications I should know?\u003c\/h3\u003e\n\u003cp\u003eThe sensor is a heated, threaded oxygen sensor with a female connector and four wires. It arrives in a box and includes one sensor; overall harness length is 400 mm—sufficient for the intended factory routing on compatible vehicles.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eReference numbers: 250-241255, 250241255\u003c\/li\u003e\n  \u003cli\u003eWire count: 4; connector gender: female\u003c\/li\u003e\n  \u003cli\u003eOverall harness length: 400 mm; mounting: threaded\u003c\/li\u003e\n  \u003cli\u003eSensor type: heated O2 sensor; package: single sensor in a box\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does installation and performance look for a downstream replacement?\u003c\/h3\u003e\n\u003cp\u003eInstallation is typically straightforward for anyone comfortable working under the vehicle or with a professional mechanic; the sensor uses a threaded mount and standard four-pin connector. As a downstream sensor, it monitors post-catalytic converter oxygen levels—useful for diagnostic readings and emissions system monitoring.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eThreaded mounting fits factory O2 sensor ports—no cutting or splicing required when matched correctly\u003c\/li\u003e\n  \u003cli\u003eFour-wire heated design helps faster warm-up for accurate readings under many conditions\u003c\/li\u003e\n  \u003cli\u003e400 mm harness length is intended for OEM routing; check reach before installation\u003c\/li\u003e\n  \u003cli\u003eBoxed packaging protects the sensor during shipping and storage\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for? Automotive DIYers, independent technicians, and fleet managers who need a reliable downstream oxygen sensor replacement for supported Nissan and Infiniti models will find this A-Premium part useful. It’s intended for people replacing failed post-catalytic sensors, addressing check engine codes related to downstream oxygen signals, or restoring correct emissions monitoring after repairs. Always verify part compatibility with your vehicle’s year, engine code, and exact sensor position before purchase.\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: Does this sensor fit my 2021 Nissan Altima 2.0L?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes—this downstream sensor fits 2019–2021 Altima L4 2.0L (B1S2, engine code KR20DDET). Verify the sensor position before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What warranty does A-Premium provide?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: A-Premium includes a one-year unlimited-mileage guarantee on this oxygen sensor.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"A-Premium","offers":[{"title":"Default Title","offer_id":48082901434526,"sku":"B0B1V7C7SX","price":57.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/a-premium-downstream-o2-front-view.jpg?v=1785818946","url":"https:\/\/northtrailauto.ca\/products\/a-premium-downstream-o2-oxygen-sensor-compatible-with-nissan-infiniti-4-wire-heated-400mm-250-241255","provider":"North Trail Auto","version":"1.0","type":"link"}