{"product_id":"ntk-25612-oxygen-sensor-downstream-downstream-left-or-downstream-right","title":"NTK 25612 Oxygen Sensor - Downstream, Downstream Left or Downstream Right","description":"\u003ch2\u003eDirect Fit Oxygen Sensor Overview\u003c\/h2\u003e\u003cp\u003eNTK 25612 is a direct fit heated oxygen sensor built for specific import applications. It uses a threaded mounting design with a 4-wire layout and OE-style fit, form, and function for accurate replacement service.\u003c\/p\u003e\u003cp\u003eCompatible with BMW, Mercedes-Benz, and Rolls-Royce applications, this sensor supports downstream exhaust monitoring where the original sensor has failed or is no longer responding correctly. The NTK 25612 is engineered for specific fitment, not universal use.\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 design for direct replacement service\u003c\/li\u003e\n\u003cli\u003eThreaded mounting type for OE-style installation\u003c\/li\u003e\n\u003cli\u003e4-wire configuration for the listed applications\u003c\/li\u003e\n\u003cli\u003e16.7500 wiring harness length\u003c\/li\u003e\n\u003cli\u003e18.000 thread diameter\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Application Notes\u003c\/h2\u003e\u003cp\u003eThis NTK oxygen sensor is listed for downstream positions on select BMW X6, BMW M3, BMW X5, BMW 550i, BMW 650i, BMW 323i, BMW 750i, BMW 750Li, BMW 760Li, BMW 525i, BMW 525xi, BMW 530i, BMW 530xi, Mercedes-Benz CLK320, Mercedes-Benz CLK430, Mercedes-Benz CLK55 AMG, and Rolls-Royce Phantom applications. The part number 25612 should be matched to the exact vehicle, model year, and downstream position shown in the fitment data.\u003c\/p\u003e\u003cp\u003eNTK is part of the NGK family and is recognized as a major original equipment oxygen sensor supplier. The brand uses ceramic-focused manufacturing technology and tests sensors during production to meet OE-level specifications for fit and reliability. This part cross-references Bosch (e.g., 16320, 16421) for the same application.\u003c\/p\u003e\u003ch2\u003eCommon Replacement Reasons\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFault codes related to downstream oxygen sensor performance\u003c\/li\u003e\n\u003cli\u003eIncorrect air-fuel feedback from a worn sensor\u003c\/li\u003e\n\u003cli\u003eSlow sensor response during exhaust monitoring\u003c\/li\u003e\n\u003cli\u003eFailed emissions inspection tied to oxygen sensor output\u003c\/li\u003e\n\u003cli\u003eDamaged connector or degraded sensor wiring\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Quality\u003c\/h2\u003e\u003cp\u003eConfirm the exact position, connector style, and thread specification before installation. Because this is a specific-fit sensor, it should be matched to the vehicle application listed in the fitment table rather than substituted by universal part type alone.\u003c\/p\u003e\u003cp\u003eNTK 25612 is manufactured and tested to meet or exceed OE specifications, with application coverage developed for import and domestic sensor needs.\u003c\/p\u003e","brand":"NTK","offers":[{"title":"Default Title","offer_id":53731439378613,"sku":"BFPZ-25612","price":95.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NO_25612_Fro.jpg?v=1794296466","url":"https:\/\/www.partcatalog.com\/products\/ntk-25612-oxygen-sensor-downstream-downstream-left-or-downstream-right","provider":"PartCatalog","version":"1.0","type":"link"}