{"product_id":"ntk-21539-oxygen-sensor","title":"NTK 21539 Oxygen Sensor","description":"\u003ch2\u003eOverview of NTK Direct Fit Oxygen Sensor 21539\u003c\/h2\u003e\u003cp\u003eThe NTK Direct Fit Oxygen Sensor 21539 is engineered for precise emission control in select GM vehicles. Designed as a heated oxygen sensor with a specific fit, it ensures accurate air-fuel mixture readings for optimal engine performance and reduced emissions.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eHeated oxygen sensor type for faster response times\u003c\/li\u003e\n\u003cli\u003eSpecific fit for Buick, Cadillac, Chevrolet, GMC, Oldsmobile, and Pontiac models\u003c\/li\u003e\n\u003cli\u003e15.25-inch wiring harness length for convenient installation\u003c\/li\u003e\n\u003cli\u003eFour-wire configuration supporting sensor heating and signal transmission\u003c\/li\u003e\n\u003cli\u003eThreaded mounting type with 18mm thread diameter for secure attachment\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDirect Fit Oxygen Sensor Product Line Details\u003c\/h2\u003e\u003cp\u003eThe NTK Direct Fit Oxygen Sensor line focuses on providing vehicle-specific sensors that match OEM specifications. This ensures compatibility and reliable performance without the need for modifications. The 21539 part number belongs to this line, offering a direct replacement solution for various GM trucks, SUVs, and cars.\u003c\/p\u003e\u003ch2\u003eTechnical Description and Compatibility\u003c\/h2\u003e\u003cp\u003eThis oxygen sensor features a heated element to quickly reach operating temperature, improving sensor accuracy during cold starts. The 4-wire design includes two wires for the heater circuit and two for the sensor signal, supporting stable and consistent readings. With a 15.25-inch wiring harness, the sensor allows for proper routing and connection within the engine bay. The threaded mounting type with an 18mm diameter ensures a secure fit in the exhaust system.\u003c\/p\u003e\u003cp\u003eCompatible with a wide range of GM vehicles, including Buick Achieva, Cadillac DeVille, Chevrolet Silverado 1500, GMC Sierra 2500, Oldsmobile Cutlass Supreme, and Pontiac Grand Prix, this sensor meets the specific fitment requirements for these models.\u003c\/p\u003e\u003ch2\u003eCommon Applications and Issues Addressed\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestores accurate oxygen level readings for proper fuel mixture\u003c\/li\u003e\n\u003cli\u003eHelps resolve check engine light codes related to oxygen sensors\u003c\/li\u003e\n\u003cli\u003eImproves fuel efficiency by enabling correct air-fuel ratio adjustments\u003c\/li\u003e\n\u003cli\u003eReduces harmful emissions by ensuring proper catalytic converter function\u003c\/li\u003e\n\u003cli\u003eEliminates rough idling or engine hesitation caused by faulty sensors\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEnsure the vehicle is compatible with NTK part number 21539 before installation\u003c\/li\u003e\n\u003cli\u003eUse proper tools to remove the old sensor and avoid damaging the exhaust threads\u003c\/li\u003e\n\u003cli\u003eCheck wiring harness length and routing to prevent strain or interference\u003c\/li\u003e\n\u003cli\u003eApply anti-seize compound on threads if recommended by vehicle manufacturer\u003c\/li\u003e\n\u003cli\u003eVerify sensor connector is securely attached to avoid signal issues\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eNTK oxygen sensors are manufactured to meet strict quality standards for durability and performance. The Direct Fit Oxygen Sensor 21539 undergoes rigorous testing to ensure reliable operation under various driving conditions. Warranty coverage details should be confirmed with the product documentation or supplier.\u003c\/p\u003e","brand":"NTK","offers":[{"title":"Default Title","offer_id":43961910165685,"sku":"BFPZ-21539","price":66.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NO_21539_Fro.jpg?v=1775006700","url":"https:\/\/www.partcatalog.com\/products\/ntk-21539-oxygen-sensor","provider":"PartCatalog","version":"1.0","type":"link"}