{"product_id":"ntk-21521-oxygen-sensor-downstream-left-or-downstream-right","title":"NTK 21521 Oxygen Sensor - Downstream Left or Downstream Right","description":"\u003ch2\u003eDirect Fit Oxygen Sensor\u003c\/h2\u003e\u003cp\u003eNTK 21521 is a direct fit heated oxygen sensor built for specific applications and engineered to match OE-style fit, form, and function. It is a threaded sensor with a 4-wire design and a 14.7500 wiring harness length for targeted replacement service.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHeated oxygen sensor for precise exhaust feedback.\u003c\/li\u003e\n\u003cli\u003eSpecific-fit design for direct replacement service.\u003c\/li\u003e\n\u003cli\u003e4-wire configuration for application-matched connectivity.\u003c\/li\u003e\n\u003cli\u003eThreaded mounting with 18.000 thread diameter.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eApplication Details\u003c\/h2\u003e\u003cp\u003eFits 1999-2001 Cadillac Catera, downstream right. Fits 1999-2001 Cadillac Catera, downstream left. This part cross-references Bosch 16063 and Delphi ES20108 for the same application. NTK 21521 is part of the Direct Fit Oxygen Sensor line, which focuses on application-specific coverage and OE-style replacement geometry for import and domestic vehicles.\u003c\/p\u003e\u003ch2\u003eWhat It Helps Address\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eFaulty oxygen sensor readings that can trigger engine management concerns.\u003c\/li\u003e\n\u003cli\u003eSlow sensor response that can affect fuel control accuracy.\u003c\/li\u003e\n\u003cli\u003eExhaust feedback issues related to a worn heated sensor.\u003c\/li\u003e\n\u003cli\u003eReplacement needs for a threaded, specific-fit sensor assembly.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\u003cp\u003eUse the listed fitment and position details to confirm the correct downstream side before installation. Verify connector style, thread diameter, and harness length against the original sensor on the vehicle. Because this is a specific-fit oxygen sensor, it is intended for direct replacement on the listed Cadillac Catera applications.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eNTK is a major original equipment oxygen sensor supplier and manufacturer. Each sensor is extensively tested during production to help ensure quality and reliability that meet or exceed OE specifications.\u003c\/p\u003e","brand":"NTK","offers":[{"title":"Default Title","offer_id":53731383181493,"sku":"BFPZ-21521","price":118.94,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NO_21521_Fro.jpg?v=1794294460","url":"https:\/\/www.partcatalog.com\/products\/ntk-21521-oxygen-sensor-downstream-left-or-downstream-right","provider":"PartCatalog","version":"1.0","type":"link"}