{"product_id":"a-premium-downstream-heated-o2-oxygen-sensor-for-hyundai-kia-4-wire-b1s2-threaded-direct-fit","title":"A-Premium Downstream Heated O2 Oxygen Sensor for Hyundai\/Kia — 4-Wire B1S2, Threaded Direct Fit","description":"\u003cp\u003e\u003cstrong\u003eThe A-Premium downstream (B1S2) heated oxygen sensor replaces the rear O2 sensor on select Hyundai and Kia models to restore accurate exhaust monitoring and emissions performance.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis OEM-fit replacement oxygen sensor is engineered to match factory dimensions and electrical connections for a straightforward swap. It uses a 4-wire heated design and threaded mounting to provide fast warm-up and reliable feedback to the engine control module. Before ordering, verify vehicle compatibility with your year, engine size, drivetrain, and emissions configuration using the fitment details below.\u003c\/p\u003e\n\n\u003ch3\u003eWhich vehicles and years does this downstream sensor fit?\u003c\/h3\u003e\n\u003cp\u003eThis A-Premium sensor covers many Hyundai and Kia applications across several production years. Fitment is split by specific engine sizes and transmissions; some listings apply only to California or federal emissions versions, so double-check your VIN or vehicle selector.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHyundai Sonata: 2009–2015 variants with 2.4L engines (specific model years and transmission types apply).\u003c\/li\u003e\n  \u003cli\u003eHyundai Tucson\/Santa Fe\/Genesis Coupe and select Santa Fe Sport models across 2010–2016 ranges.\u003c\/li\u003e\n  \u003cli\u003eKia Forte, Forte Koup, Optima, Sorento, Sportage models with 2.0L or 2.4L engines for listed years.\u003c\/li\u003e\n  \u003cli\u003eNot compatible with models requiring Federal emissions configuration on certain listings—confirm before purchasing.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the technical specifications and reference numbers?\u003c\/h3\u003e\n\u003cp\u003eThis unit is a threaded, heated oxygen sensor with a male connector and four wires for heater and signal circuits. It ships boxed as a single sensor and is intended as a direct replacement for the factory downstream sensor.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eSensor type: Heated downstream oxygen sensor (B1S2).\u003c\/li\u003e\n  \u003cli\u003eWire count: 4 (heater + signal\/ground circuits).\u003c\/li\u003e\n  \u003cli\u003eMounting: Threaded for standard O2 bung installation.\u003c\/li\u003e\n  \u003cli\u003eReference numbers: 250-24878, 350-34630, 25024878, 35034630.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow do I confirm fitment and install the sensor?\u003c\/h3\u003e\n\u003cp\u003eAlways enter your vehicle information in the selector or verify VIN compatibility before ordering. Installation typically requires access under the vehicle or to the exhaust pipe and basic hand tools; anti-seize and proper torque help ensure a reliable seal.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCheck vehicle year, engine displacement, transmission type, and emissions label.\u003c\/li\u003e\n  \u003cli\u003eUnplug the factory harness, remove the old threaded sensor, apply anti-seize to new threads if needed, and torque to spec.\u003c\/li\u003e\n  \u003cli\u003eReconnect the 4-pin harness and clear any OBD-II codes after replacement.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat are the performance and quality considerations?\u003c\/h3\u003e\n\u003cp\u003eThis aftermarket sensor is produced to meet common OEM electrical and physical standards for the listed applications. Using a heated sensor reduces warm-up time, helping the engine control module obtain meaningful oxygen readings sooner after start-up.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHeated element for faster activation during cold starts.\u003c\/li\u003e\n  \u003cli\u003eMale connector with factory-style wiring for plug-and-play replacement.\u003c\/li\u003e\n  \u003cli\u003eBoxed single-piece packaging for protection in transit.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The A-Premium downstream O2 sensor is intended for DIY mechanics and professional technicians replacing a failing rear oxygen sensor on compatible Hyundai and Kia vehicles. If your vehicle shows downstream sensor fault codes, reduced fuel\/diagnostic performance, or failed emissions checks and your model year\/engine matches the listing, this direct-fit, 4-wire heated sensor provides a cost-effective replacement. Remember to confirm your vehicle details (VIN\/year\/engine\/transmission\/emissions) before purchase to ensure proper compatibility.\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 A-Premium sensor compatible with my Sonata or Tucson?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Check your year, engine (2.0L\/2.4L), transmission, and emissions; this sensor fits many 2009–2016 Hyundai models listed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How many wires and what connector type does it use?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: This is a 4-wire heated oxygen sensor with a male connector and threaded mounting for direct replacement.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"A-Premium","offers":[{"title":"Default Title","offer_id":48084850671774,"sku":"B07GHCN5BX","price":37.98,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/a-premium-downstream-front-view.jpg?v=1785863716","url":"https:\/\/northtrailauto.ca\/products\/a-premium-downstream-heated-o2-oxygen-sensor-for-hyundai-kia-4-wire-b1s2-threaded-direct-fit","provider":"North Trail Auto","version":"1.0","type":"link"}