{"product_id":"ntk-25173-oxygen-sensor-downstream-or-downstream-left","title":"NTK 25173 Oxygen Sensor - Downstream or Downstream Left","description":"\u003ch2\u003eDirect Fit Oxygen Sensor for Audi Applications\u003c\/h2\u003e\u003cp\u003eThe NTK 25173 is a direct fit heated oxygen sensor built for specific Audi applications. It uses a threaded mounting design and a 4-wire configuration with a 38.25-inch harness for a precise replacement path.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eDirect fit oxygen sensor for specific applications\u003c\/li\u003e\n\u003cli\u003eHeated sensor design for faster operating response\u003c\/li\u003e\n\u003cli\u003e4-wire construction\u003c\/li\u003e\n\u003cli\u003eThreaded mounting type\u003c\/li\u003e\n\u003cli\u003e38.25-inch wiring harness length\u003c\/li\u003e\n\u003cli\u003eNTK 25173 part number for identification\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Description\u003c\/h2\u003e\u003cp\u003eNTK 25173 is part of the Direct Fit Oxygen Sensor line, built to match OE-style fit, form, and function for import and domestic coverage. NTK draws on its role as a major original equipment oxygen sensor supplier and applies ceramic sensor expertise from raw material through finished product. This oxygen sensor is engineered for specific Audi fitments, including Audi A4, Audi A4 Quattro, Audi A6, and Audi A6 Quattro applications listed below. The NTK 25173 is a practical replacement choice when the original sensor needs to be restored to proper operation.\u003c\/p\u003e\u003cp\u003eThis part cross-references DENSO Auto Parts (e.g., 234-4409) for the same application.\u003c\/p\u003e\u003ch2\u003eWhat It Helps Fix\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFaulty oxygen sensor readings\u003c\/li\u003e\n\u003cli\u003eCheck engine light concerns related to sensor performance\u003c\/li\u003e\n\u003cli\u003eIncorrect air-fuel mixture feedback\u003c\/li\u003e\n\u003cli\u003eEmissions system inspection failures tied to sensor output\u003c\/li\u003e\n\u003cli\u003eSlow sensor response from a worn heated sensor\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eFits 2010-2011 Audi A6, downstream. Fits 2009 Audi A6 Quattro, downstream left. Fits 2006 Audi A4, downstream left. Fits 2006 Audi A4 Quattro, downstream left. Fits 2005 Audi A4 Quattro, downstream left. Confirm the connector style, harness length, and threaded mounting location before installation. Use the vehicle’s listed chassis note where applicable, including the 2006 A4 and A4 Quattro chassis break.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eNTK tests these oxygen sensors during manufacturing to meet or exceed OE specifications. The brand’s OE supplier background and ceramic sensor manufacturing process support consistent fit and reliable performance.\u003c\/p\u003e","brand":"NTK","offers":[{"title":"Default Title","offer_id":53260846760117,"sku":"BFPZ-25173","price":173.79,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NO_25173_Fro.jpg?v=1789276881","url":"https:\/\/www.partcatalog.com\/products\/ntk-25173-oxygen-sensor-downstream-or-downstream-left","provider":"PartCatalog","version":"1.0","type":"link"}