{"product_id":"walker-250-54079-oxygen-sensor-upstream","title":"Walker 250-54079 Oxygen Sensor - Upstream","description":"\u003ch2\u003eOE Oxygen Sensor for Subaru Impreza and WRX STI\u003c\/h2\u003e\u003cp\u003eWalker Products OE 250-54079 is a heated, specific-fit oxygen sensor engineered for direct replacement in select Subaru applications. It is built for upstream placement and provides the ECU with the feedback needed for accurate fuel control and emissions monitoring.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eHeated oxygen sensor for faster operating response\u003c\/li\u003e\n\u003cli\u003eSpecific fit for the listed Subaru applications\u003c\/li\u003e\n\u003cli\u003eUpstream mounting position\u003c\/li\u003e\n\u003cli\u003e4-wire design with 20-gauge wiring\u003c\/li\u003e\n\u003cli\u003eThreaded mount with 18.0 mm thread diameter\u003c\/li\u003e\n\u003cli\u003eRadiused polygon male connector for vehicle-specific connection\u003c\/li\u003e\n\u003cli\u003eWiring harness length: 29.06 in.; overall length: 32.6 in.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProduct Details\u003c\/h2\u003e\u003cp\u003eWalker Products OE 250-54079 is part of the Walker Products OE line, which focuses on original-equipment-style replacement sensors for vehicle-specific fitment and ECU feedback requirements. This oxygen sensor is listed for 2008-2014 Subaru Impreza, upstream, and 2014 Subaru WRX STI, upstream. It is designed for Bank 1 Sensor 1 and front oxygen sensor applications where the vehicle calls for an upstream heated oxygen sensor. The part number 250-54079 is a direct reference for shoppers searching for an upstream oxygen sensor for Subaru Impreza or Subaru WRX STI models.\u003c\/p\u003e\u003cp\u003eThis part cross-references Walker Products OE 250-54079 for the same application.\u003c\/p\u003e\u003ch2\u003eCommon Issues This Sensor Can Address\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eCheck engine light or malfunction indicator light related to oxygen sensor performance\u003c\/li\u003e\n\u003cli\u003ePoor engine operation caused by incorrect air-fuel feedback\u003c\/li\u003e\n\u003cli\u003eIncreased fuel consumption from inaccurate exhaust readings\u003c\/li\u003e\n\u003cli\u003eHigher exhaust emissions from a failing upstream sensor\u003c\/li\u003e\n\u003cli\u003eStored ECU fault codes tied to the affected sensor circuit\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eVerify the connector shape, wire count, thread diameter, and upstream position before installation. Inspect the sensor wiring harness and connector for heat damage, abrasion, or corrosion, since physical damage can shorten service life and affect signal quality. Confirm the vehicle’s fault code and sensor location before replacing the part. For Subaru Impreza and WRX STI applications, match the upstream Bank 1 Sensor 1 or front oxygen sensor requirement exactly.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eWalker Products has produced engine management and oxygen sensor components since 1946 and manufactures this part as an OE-style replacement for the specified application. The company is ISO 9001\/TS 16949 certified, supporting consistent manufacturing and application-specific fitment.\u003c\/p\u003e","brand":"Walker","offers":[{"title":"Default Title","offer_id":51870209278133,"sku":"DKHD-250-54079","price":129.45,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/O2_25054079_Fro.jpg?v=1774891829","url":"https:\/\/www.partcatalog.com\/products\/walker-250-54079-oxygen-sensor-upstream","provider":"PartCatalog","version":"1.0","type":"link"}