{"product_id":"ntk-25506-oxygen-sensor-upstream","title":"NTK 25506 Oxygen Sensor - Upstream","description":"\u003ch2\u003eDirect Fit Oxygen Sensor\u003c\/h2\u003e\u003cp\u003eNTK 25506 is a direct fit heated oxygen sensor built for specific applications with threaded mounting and a 3-wire design. It is engineered for accurate air-fuel ratio feedback and OE-style fitment on select Porsche applications.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHeated oxygen sensor for faster operating response\u003c\/li\u003e\n\u003cli\u003eSpecific-fit design for direct replacement applications\u003c\/li\u003e\n\u003cli\u003eThreaded mounting with 18 mm thread diameter\u003c\/li\u003e\n\u003cli\u003e21.75-inch wiring harness length for application-specific routing\u003c\/li\u003e\n\u003cli\u003e3-wire configuration for controlled signal output\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eFitment Details\u003c\/h2\u003e\u003cp\u003eCompatible with select Porsche applications. Fits 1986-1987 Porsche 928, upstream. Fits 1984-1985 Porsche 911, upstream. Fits 1983-1985 Porsche 928, upstream. This part cross-references BBB Industries 13918 and Carlson 13003 for the same application.\u003c\/p\u003e\u003cp\u003eNTK 25506 is part of the Direct Fit Oxygen Sensor line, which focuses on application-specific coverage and OE-style replacement geometry. NTK draws on its role as a major oxygen sensor manufacturer to deliver fit, form, and function aligned with original equipment expectations.\u003c\/p\u003e\u003ch2\u003eWhat It Helps Address\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFaulty oxygen sensor readings\u003c\/li\u003e\n\u003cli\u003eDelayed closed-loop fuel control\u003c\/li\u003e\n\u003cli\u003eCheck engine light concerns related to sensor performance\u003c\/li\u003e\n\u003cli\u003eRough air-fuel ratio correction\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eUse the threaded mounting design and harness length to match the original routing before installation. Verify the upstream location, thread size, and wire count against the removed sensor to confirm correct application for Porsche 928 and Porsche 911 fitment. Because this is a specific-fit sensor, confirm connector and mounting details before installation.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eNTK tests these oxygen sensors during manufacturing to help ensure quality and reliability that meet or exceed OE specifications. The brand is part of the NGK family and is recognized for original equipment oxygen sensor production.\u003c\/p\u003e","brand":"NTK","offers":[{"title":"Default Title","offer_id":53731436691637,"sku":"BFPZ-25506","price":109.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NO_25506_Fro.jpg?v=1794296142","url":"https:\/\/www.partcatalog.com\/products\/ntk-25506-oxygen-sensor-upstream","provider":"PartCatalog","version":"1.0","type":"link"}