{"product_id":"ntk-25531-oxygen-sensor-upstream","title":"NTK 25531 Oxygen Sensor - Upstream","description":"\u003ch2\u003eDirect Fit Oxygen Sensor for Peugeot 405\u003c\/h2\u003e\u003cp\u003eNTK Direct Fit Oxygen Sensor 25531 is a specific-fit heated oxygen sensor built for the Peugeot 405 upstream application. It uses a threaded mounting design and a 4-wire configuration to support accurate air-fuel ratio monitoring in the exhaust stream.\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 application matching\u003c\/li\u003e\n\u003cli\u003eThreaded mounting type for secure installation\u003c\/li\u003e\n\u003cli\u003e4-wire construction for signal and heater circuit operation\u003c\/li\u003e\n\u003cli\u003e48.2500 wiring harness length\u003c\/li\u003e\n\u003cli\u003e18.000 thread diameter\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Description\u003c\/h2\u003e\u003cp\u003eNTK 25531 is part of the Direct Fit Oxygen Sensor line, a product line focused on application-specific replacement sensors. NTK draws on its background as a major oxygen sensor manufacturer and OE supplier to deliver fit, form, and function that align with original equipment requirements. This sensor is engineered for the 1989-1991 Peugeot 405 upstream position, where it monitors exhaust oxygen content to help the engine control system maintain the proper air-fuel mixture. This part cross-references Bosch 13078 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 accurate air-fuel ratio feedback\u003c\/li\u003e\n\u003cli\u003eAddressing check engine light concerns tied to sensor performance\u003c\/li\u003e\n\u003cli\u003eCorrecting drivability issues related to improper fuel control\u003c\/li\u003e\n\u003cli\u003eSupporting emissions system operation on the Peugeot 405\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eVerify the threaded mounting style, wire count, and harness length before installation. Confirm the upstream location and OE-style application match the vehicle configuration. Use the part number 25531 to confirm the correct sensor before ordering or installation.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eNTK tests oxygen sensors during manufacturing to help ensure quality and reliability that meet or exceed OE specifications. The 25531 is built with OE application technology and is backed by NTK's focus on original equipment sensor coverage.\u003c\/p\u003e","brand":"NTK","offers":[{"title":"Default Title","offer_id":53731437281461,"sku":"BFPZ-25531","price":89.34,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NO_25531_Fro.jpg?v=1794296218","url":"https:\/\/www.partcatalog.com\/products\/ntk-25531-oxygen-sensor-upstream","provider":"PartCatalog","version":"1.0","type":"link"}