{"product_id":"ntk-21543-oxygen-sensor","title":"NTK 21543 Oxygen Sensor - Upstream, Upstream Left or Upstream Right","description":"\u003ch2\u003eOverview of NTK Direct Fit Oxygen Sensor 21543\u003c\/h2\u003e\u003cp\u003eThe NTK Direct Fit Oxygen Sensor 21543 is engineered for precise emission control in select Chevrolet and GMC vehicles. Designed as a heated oxygen sensor with a specific fit, it ensures accurate air-fuel mixture readings to support optimal engine performance and emissions compliance.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHeated oxygen sensor type for faster response times\u003c\/li\u003e\n\u003cli\u003eSpecific fit for Chevrolet and GMC models including Silverado 2500 and Tahoe\u003c\/li\u003e\n\u003cli\u003e14.75-inch wiring harness length for direct connection\u003c\/li\u003e\n\u003cli\u003eThreaded mounting type with 18mm thread diameter\u003c\/li\u003e\n\u003cli\u003eFour-wire configuration for reliable signal transmission\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eAbout the NTK Direct Fit Oxygen Sensor Line\u003c\/h2\u003e\u003cp\u003eThe Direct Fit Oxygen Sensor line by NTK is designed to provide exact replacement sensors that match original equipment specifications. This ensures compatibility and ease of installation without the need for modifications. The 21543 sensor maintains the integrity of the vehicle’s emission system by delivering accurate oxygen level readings, which are critical for engine control modules to adjust fuel delivery efficiently.\u003c\/p\u003e\u003ch2\u003eDetailed Product Description\u003c\/h2\u003e\u003cp\u003eThis NTK oxygen sensor features a heated element that allows it to reach operating temperature quickly, improving sensor response and reducing emissions during cold starts. The 14.75-inch wiring harness length is tailored for a direct fit installation in specific Chevrolet and GMC models such as the C1500 Suburban, Express 2500, and Yukon XL 2500. The sensor’s threaded mounting type with an 18mm diameter ensures secure attachment to the exhaust system. With four wires, this sensor supports both the heater circuit and signal output, providing reliable data to the vehicle’s engine control unit.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestores accurate oxygen sensing for proper air-fuel ratio management\u003c\/li\u003e\n\u003cli\u003eHelps resolve check engine light triggers related to oxygen sensor faults\u003c\/li\u003e\n\u003cli\u003eImproves fuel efficiency by enabling precise fuel mixture adjustments\u003c\/li\u003e\n\u003cli\u003eReduces harmful emissions by maintaining proper combustion control\u003c\/li\u003e\n\u003cli\u003ePrevents drivability issues such as rough idling or hesitation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eInstallation of the NTK 21543 oxygen sensor requires removal of the old sensor from the exhaust manifold or pipe. Ensure the vehicle is cool before starting to avoid burns. Use appropriate tools to avoid damaging the sensor or threads. The 14.75-inch wiring harness length allows for a direct plug-in connection without splicing. Verify the sensor orientation and torque specifications according to the vehicle manufacturer’s guidelines to ensure proper sealing and function.\u003c\/p\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eNTK oxygen sensors are manufactured to meet or exceed OEM standards for durability and performance. The Direct Fit Oxygen Sensor 21543 undergoes rigorous testing to ensure reliable operation under various driving conditions. While specific warranty details may vary, NTK typically offers coverage against defects in materials and workmanship to provide confidence in product quality.\u003c\/p\u003e","brand":"NTK","offers":[{"title":"Default Title","offer_id":43961910198453,"sku":"BFPZ-21543","price":54.27,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NO_21543_Fro_660e62aa-b038-448e-ac62-f820d9adae3e.jpg?v=1775006701","url":"https:\/\/www.partcatalog.com\/products\/ntk-21543-oxygen-sensor","provider":"PartCatalog","version":"1.0","type":"link"}