{"product_id":"walker-250-23121-oxygen-sensor","title":"Walker 250-23121 Oxygen Sensor","description":"\u003ch2\u003eWalker Products OE Oxygen Sensor for Nissan and Infiniti\u003c\/h2\u003e\u003cp\u003eWalker Products OE 250-23121 is a heated oxygen sensor built for specific upstream applications on select Nissan and Infiniti vehicles. It is engineered as an OE-style replacement to deliver the diagnostic feedback the ECU expects, helping maintain proper air-fuel control and emissions performance.\u003c\/p\u003e\u003cp\u003eFor shoppers searching for an upstream oxygen sensor for a 2000-2001 Nissan Altima, 2001 Nissan Frontier, or 2000-2001 Infiniti G20, this Walker Products OE sensor is matched to the listed position and application details.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003ePart number: 250-23121\u003c\/li\u003e\n\u003cli\u003eHeated oxygen sensor design for faster operating response\u003c\/li\u003e\n\u003cli\u003eSpecific fit for the listed upstream positions\u003c\/li\u003e\n\u003cli\u003e3-wire configuration with 20-gauge wiring\u003c\/li\u003e\n\u003cli\u003eThreaded mounting with 18.0 mm thread diameter\u003c\/li\u003e\n\u003cli\u003eRadiused polygon male connector for application-specific connection\u003c\/li\u003e\n\u003cli\u003eWiring harness length: 12.91\u003c\/li\u003e\n\u003cli\u003eOverall length: 16.46\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProduct Details\u003c\/h2\u003e\u003cp\u003eWalker Products OE focuses on engine management and oxygen\/air-fuel sensors built for direct replacement use. The 250-23121 oxygen sensor is designed for the exact fitment position on the vehicle, including upstream, upstream front, and left or right upstream locations where listed. This helps ensure the ECU receives the correct signal for fuel control and emissions monitoring on supported Nissan and Infiniti models.\u003c\/p\u003e\u003cp\u003eWalker Products 250-23121 is listed for 2000-2001 Infiniti G20, 2000-2001 Nissan Altima, 2001 Nissan Frontier, 2000-2001 Nissan Maxima, and 2000-2001 Nissan Sentra in the specified upstream positions. This part cross-references Walker Products OE 250-23121 for the same application.\u003c\/p\u003e\u003ch2\u003eWhat It Helps Address\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eCheck engine light related to oxygen sensor performance\u003c\/li\u003e\n\u003cli\u003eRough engine operation caused by incorrect exhaust feedback\u003c\/li\u003e\n\u003cli\u003eIncreased fuel consumption from inaccurate air-fuel correction\u003c\/li\u003e\n\u003cli\u003eElevated exhaust emissions from a failing upstream sensor\u003c\/li\u003e\n\u003cli\u003eFault codes stored in the ECU for sensor or related system issues\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eVerify the exact year, model, and sensor position before ordering. Confirm whether your vehicle requires upstream front, upstream left, or upstream right placement, and compare the connector shape, wire count, and thread size to the original sensor. Inspect the sensor wiring harness and connector for damage before installation, since damaged wiring can shorten sensor life and affect operation.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eWalker Products states that its engine management sensors are developed as OE replacement parts and manufactured under Automotive ISO9001\/TS 16949 certification standards. Since 1946, Walker Products has supplied engine management and fuel system components for vehicle applications worldwide.\u003c\/p\u003e","brand":"Walker","offers":[{"title":"Default Title","offer_id":51870202658997,"sku":"DKHD-250-23121","price":62.48,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/O2_25023121_Fro.jpg?v=1774891530","url":"https:\/\/www.partcatalog.com\/products\/walker-250-23121-oxygen-sensor","provider":"PartCatalog","version":"1.0","type":"link"}