{"product_id":"ntk-21561-oxygen-sensor-upstream-upstream-left-or-upstream-right","title":"NTK 21561 Oxygen Sensor - Upstream, Upstream Left or Upstream Right","description":"\u003ch2\u003eDirect-fit oxygen sensor overview\u003c\/h2\u003e\u003cp\u003eThe NTK 21561 is a direct-fit heated oxygen sensor built for specific applications that require OE-style fit, form, and function. It is engineered for upstream air\/fuel ratio monitoring and uses a threaded mounting design with a 4-wire configuration.\u003c\/p\u003e\u003cp\u003eCompatible With Chevrolet Colorado, GMC Canyon, and related applications, this sensor supports accurate exhaust feedback for vehicles that rely on precise mixture control. The NTK 21561 is part of the Direct Fit Oxygen Sensor line, which focuses on application-specific replacement coverage.\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 applications\u003c\/li\u003e\n\u003cli\u003eThreaded mounting type for OE-style installation\u003c\/li\u003e\n\u003cli\u003e4-wire configuration for signal and heater circuit operation\u003c\/li\u003e\n\u003cli\u003e19.7500-inch wiring harness length\u003c\/li\u003e\n\u003cli\u003e18.000 thread diameter\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed application information\u003c\/h2\u003e\u003cp\u003eNTK 21561 is designed for upstream oxygen sensor locations across a wide range of GM and related vehicles, including Chevrolet Colorado, GMC Canyon, and Hummer H3 applications. Fitment also includes Cadillac STS, Chevrolet Trailblazer, GMC Envoy, Saab 9-7x, and several Isuzu models, with coverage that spans multiple model years and upstream positions. This part cross-references Bosch 15131 and Delphi ES20355 for the same application.\u003c\/p\u003e\u003cp\u003eAs part of NTK's Direct Fit Oxygen Sensor line, this sensor is built around application-specific coverage and OE-style replacement requirements. NTK's background as a major original equipment oxygen sensor supplier is reflected in the focus on fitment accuracy and manufacturing consistency. The 21561 part number is also referenced in interchange listings for related aftermarket and OE applications.\u003c\/p\u003e\u003ch2\u003eCommon replacement concerns\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFaulty upstream oxygen sensor readings\u003c\/li\u003e\n\u003cli\u003eCheck engine light related to air\/fuel ratio monitoring\u003c\/li\u003e\n\u003cli\u003eRough idle or drivability issues tied to mixture control\u003c\/li\u003e\n\u003cli\u003eReduced fuel control accuracy from a worn heated sensor\u003c\/li\u003e\n\u003cli\u003eDirect-fit replacement needs for threaded sensor locations\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation notes and quality assurance\u003c\/h2\u003e\u003cp\u003eVerify the connector style, thread diameter, harness length, and upstream position before installation. This sensor uses a threaded mounting type and a 4-wire heated design, so matching the original application details is important for proper operation.\u003c\/p\u003e\u003cp\u003eNTK states that these oxygen sensors are extensively tested during manufacturing and are built to meet or exceed OE specifications. The 21561 is backed by that OE-focused manufacturing approach and application coverage.\u003c\/p\u003e","brand":"NTK","offers":[{"title":"Default Title","offer_id":53731383738549,"sku":"BFPZ-21561","price":62.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NO_21561_Fro.jpg?v=1794294506","url":"https:\/\/www.partcatalog.com\/products\/ntk-21561-oxygen-sensor-upstream-upstream-left-or-upstream-right","provider":"PartCatalog","version":"1.0","type":"link"}