{"product_id":"ntk-25512-oxygen-sensor-upstream","title":"NTK 25512 Oxygen Sensor - Upstream","description":"\u003ch2\u003eDirect Fit Oxygen Sensor\u003c\/h2\u003e\u003cp\u003eNTK 25512 is a direct fit heated oxygen sensor for specific BMW applications. It is built with a threaded mounting design and a 3-wire configuration for accurate air\/fuel ratio feedback in upstream locations.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDirect fit design for specific applications\u003c\/li\u003e\n\u003cli\u003eHeated oxygen sensor construction\u003c\/li\u003e\n\u003cli\u003e3-wire configuration\u003c\/li\u003e\n\u003cli\u003eThreaded mounting type\u003c\/li\u003e\n\u003cli\u003e69.25-inch wiring harness length\u003c\/li\u003e\n\u003cli\u003e18 mm thread diameter\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Description\u003c\/h2\u003e\u003cp\u003eNTK 25512 is part of the Direct Fit Oxygen Sensor line, engineered for specific import and domestic applications with OE-style fit, form, and function. NTK applies ceramic sensor manufacturing expertise and extensive production testing to deliver a replacement oxygen sensor that meets or exceeds OE specifications. This part number is used in upstream BMW 535i, 635CSi, L6, L7, M5, and M6 applications, including BMW 635CSi fitments for cylinders 1-3 and cylinders 4-6. The 25512 supports air\/fuel ratio monitoring where precise sensor response is required.\u003c\/p\u003e\u003cp\u003eThis part cross-references Bosch 13049 and OSC 13059 for the same application.\u003c\/p\u003e\u003ch2\u003eWhat It Is Used For\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eReplacing a failed upstream oxygen sensor\u003c\/li\u003e\n\u003cli\u003eRestoring air\/fuel ratio signal accuracy\u003c\/li\u003e\n\u003cli\u003eAddressing check engine light concerns related to sensor performance\u003c\/li\u003e\n\u003cli\u003eCorrecting drivability issues caused by inaccurate exhaust feedback\u003c\/li\u003e\n\u003cli\u003eReplacing a sensor with worn heater or signal response\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eVerify the connector, harness length, thread diameter, and mounting style before installation. Confirm the vehicle’s bank and sensor location against the listed fitment, since this part is specific to upstream BMW applications. Use the fitment notes to match the correct cylinder group or sensor position for the application.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eNTK is a major original equipment oxygen sensor supplier and tests these sensors during manufacturing to help ensure quality and reliability that meet or exceed OE specifications.\u003c\/p\u003e","brand":"NTK","offers":[{"title":"Default Title","offer_id":53731437052085,"sku":"BFPZ-25512","price":90.31,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NO_25512_Fro.jpg?v=1794296180","url":"https:\/\/www.partcatalog.com\/products\/ntk-25512-oxygen-sensor-upstream","provider":"PartCatalog","version":"1.0","type":"link"}