{"product_id":"ntk-25578-oxygen-sensor-upstream","title":"NTK 25578 Oxygen Sensor - Upstream","description":"\u003ch2\u003eDirect-Fit Oxygen Sensor\u003c\/h2\u003e\u003cp\u003eNTK 25578 is a direct-fit heated oxygen sensor built for specific applications and threaded mounting. It uses a 4-wire design with a 17.75-inch harness and an 18 mm thread diameter for a precise replacement path.\u003c\/p\u003e\u003cp\u003eCompatible with select Hyundai and Mitsubishi applications, this NTK oxygen sensor is part of the Direct Fit Oxygen Sensor line. The design focuses on OE-style fit, form, and function for import and domestic coverage.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eHeated oxygen sensor for specific-fit applications\u003c\/li\u003e\n\u003cli\u003e4-wire configuration for signal and heater circuit operation\u003c\/li\u003e\n\u003cli\u003eThreaded mounting with 18 mm thread diameter\u003c\/li\u003e\n\u003cli\u003e17.75-inch wiring harness length\u003c\/li\u003e\n\u003cli\u003eNTK 25578 direct-fit replacement\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Description\u003c\/h2\u003e\u003cp\u003eNTK 25578 is engineered as a direct-fit oxygen sensor for upstream applications where accurate air-fuel feedback is required. The heated design helps the sensor reach operating temperature quickly, while the threaded body and specific-fit configuration support straightforward replacement in the correct application. This part number is listed for 1991-1993 Mitsubishi Galant, 1992-1993 Hyundai Sonata, and 1992-1993 Hyundai Elantra applications, including upstream Bank 1 Sensor 1 and B1S1 positions where noted. If you are sourcing an oxygen sensor for a Hyundai Elantra, Hyundai Sonata, or Mitsubishi Galant, NTK 25578 provides an OE-style replacement path.\u003c\/p\u003e\u003cp\u003eNTK is known for oxygen sensor manufacturing and OE application coverage. The brand’s Direct Fit Oxygen Sensor line is built to streamline replacement selection while maintaining fit and function expectations for the listed applications. This part cross-references DENSO Auto Parts 234-4644 for the same application.\u003c\/p\u003e\u003ch2\u003eWhat It Helps Address\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFaulty oxygen sensor readings\u003c\/li\u003e\n\u003cli\u003eCheck engine light concerns related to sensor performance\u003c\/li\u003e\n\u003cli\u003eAir-fuel ratio feedback issues\u003c\/li\u003e\n\u003cli\u003eSlow sensor warm-up from a failing heater circuit\u003c\/li\u003e\n\u003cli\u003eReplacement needs for upstream sensor locations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Quality\u003c\/h2\u003e\u003cp\u003eVerify the vehicle’s year, make, model, and sensor location before installation. Match the connector, thread size, wire count, and harness length to the original part for proper fitment. NTK states that these oxygen sensors are extensively tested during manufacturing to meet or exceed OE specifications.\u003c\/p\u003e\u003cp\u003eNTK 25578 is backed by the brand’s OE-focused manufacturing approach and application coverage for import and domestic vehicles.\u003c\/p\u003e","brand":"NTK","offers":[{"title":"Default Title","offer_id":53731438624949,"sku":"BFPZ-25578","price":78.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NO_25578_Fro.jpg?v=1794296381","url":"https:\/\/www.partcatalog.com\/products\/ntk-25578-oxygen-sensor-upstream","provider":"PartCatalog","version":"1.0","type":"link"}