{"product_id":"ntk-25081-oxygen-sensor-upstream","title":"NTK 25081 Oxygen Sensor - Upstream","description":"\u003ch2\u003eDirect Fit Oxygen Sensor for Mercedes-Benz\u003c\/h2\u003e\u003cp\u003eNTK 25081 is a direct fit oxygen sensor built for specific Mercedes-Benz applications. It uses a heated, threaded design with a 3-wire configuration and a 30-inch harness length for OE-style replacement on the correct upstream location.\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\u003e3-wire configuration with threaded mounting\u003c\/li\u003e\n\u003cli\u003e30-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 25081 is part of the Direct Fit Oxygen Sensor line, engineered for specific import and domestic applications with OE-style fit, form, and function. NTK is known for oxygen sensor manufacturing and uses ceramic technology developed from raw material through finished product control. This sensor is listed for upstream use on Mercedes-Benz 300E, 300CE, 300TE, 300SE, 300SEL, 260E, 560SL, and 450SLC applications, with fitment notes that include Bank 1 Sensor 1 coverage on several models. This part cross-references Bosch (e.g., 13146, 13925) for the same application.\u003c\/p\u003e\u003ch2\u003eCommon Issues This Part May Address\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFaulty oxygen sensor signal affecting air-fuel ratio control\u003c\/li\u003e\n\u003cli\u003eCheck engine light related to upstream sensor performance\u003c\/li\u003e\n\u003cli\u003eSlow sensor response during closed-loop operation\u003c\/li\u003e\n\u003cli\u003eIncorrect fuel mixture caused by aging sensor output\u003c\/li\u003e\n\u003cli\u003eDriveability issues tied to worn sensor elements\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eConfirm the vehicle’s upstream sensor location, connector style, and thread size before installation. The fitment data for NTK 25081 includes Mercedes-Benz applications with Bank 1 Sensor 1 notes on several models, so match the exact year, model, and position before ordering. Use the listed harness length and threaded mounting details to verify routing and sensor placement.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eNTK states that its oxygen sensors are extensively tested during manufacturing to meet or exceed OE specifications. The brand also supplies original equipment oxygen sensors and supports broad application coverage through its Direct Fit Oxygen Sensor line.\u003c\/p\u003e","brand":"NTK","offers":[{"title":"Default Title","offer_id":53731435708597,"sku":"BFPZ-25081","price":141.35,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NO_25081_Fro.jpg?v=1794296027","url":"https:\/\/www.partcatalog.com\/products\/ntk-25081-oxygen-sensor-upstream","provider":"PartCatalog","version":"1.0","type":"link"}