{"product_id":"o2-oxygen-sensor-upstream-downstream-for-chevrolet-tahoe-2015-2018-5-3l-6-2l","title":"O2 Oxygen Sensor Upstream Downstream for Chevrolet Tahoe (2015-2018) 5.3L, 6.2L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit 4-Piece Upstream and Downstream O2 Oxygen Sensor Kit for 2015-2018 Chevrolet Tahoe (K2XX)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The 4-piece oxygen sensor kit monitors exhaust gas oxygen content across upstream and downstream banks on the 2015-2018 Chevrolet Tahoe to restore closed-loop AFR fueling accuracy, clear check engine lights, and optimize emissions performance.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Chevrolet Tahoe O2 Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eFactory exhaust sensors on the \u003cstrong\u003eK2XX\u003c\/strong\u003e chassis endure intense thermal cycling, exhaust soot accumulation, and blow-by oil vapor contamination. In direct-injected \u003cstrong\u003eEcoTec3 L83\u003c\/strong\u003e and \u003cstrong\u003eL86\u003c\/strong\u003e V8 engines, variable displacement operation (AFM) and high-load combustion accelerate fouling across the zirconia ceramic thimble. Over time, internal sensing elements experience signal delay, leading to sluggish voltage switching, false P0420\/P0430 catalyst efficiency DTCs, improper fuel trims, and reduced fuel economy.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive 4-sensor replacement set features dual-layer 304 stainless steel protective shields and rapid-response planar zirconia ceramic elements engineered to withstand exhaust gas temperatures reaching 1,000°C. Integrated high-efficiency internal ceramic heaters allow rapid closed-loop transition shortly after cold start, mitigating catalytic converter thermal shock. Factory-molded OEM-grade weather-pack pigtails eliminate wire splicing, while pre-applied high-temperature anti-seize on the precision-cut M18x1.5 threads prevents thread galling during service.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2 x Upstream Oxygen Sensors (Replaces \u003cstrong\u003e234-4940\u003c\/strong\u003e)\u003c\/li\u003e\n  \u003cli\u003e2 x Downstream Oxygen Sensors (Replaces \u003cstrong\u003e234-4974\u003c\/strong\u003e)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100% style=\" border-collapse: collapse border: solid font-size: min-width:\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2015-2018 Chevrolet Tahoe\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e5.3L EcoTec3 L83, 6.2L EcoTec3 L86 \/ K2XX\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e355–420 hp \/ 383–460 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e234-4940, 234-4974, 12657188, 12659516, 234-8081, 234-8088, 12627139, 12643707, 12643708, 12645561, 12655677, 12655678, 12661898, 12665162, 12666612, 12666673, 55569902, 21074, 21075, 21579, 21581, 234-4763, 2344763, 2344940, 2344974, 234-8052, 2348052\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2015-2018 Chevrolet Tahoe LS (5.3L V8 L83)\u003c\/li\u003e\n  \u003cli\u003e2015-2018 Chevrolet Tahoe LT (5.3L V8 L83)\u003c\/li\u003e\n  \u003cli\u003e2015-2018 Chevrolet Tahoe LTZ \/ Premier (5.3L V8 L83, 6.2L V8 L86)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the K2XX Tahoe?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2015-2018 Chevrolet Tahoe equipped with the 5.3L \u003cstrong\u003eL83\u003c\/strong\u003e or 6.2L \u003cstrong\u003eL86\u003c\/strong\u003e engine.\u003c\/p\u003e\n\n\u003ch4\u003eDo these sensors require calibration or harness splicing?\u003c\/h4\u003e\n\u003cp\u003eNo splicing is needed; each sensor features direct-fit OEM-style locking pin connectors that plug directly into the factory harness.\u003c\/p\u003e\n\n\u003ch3\u003eThe Chevrolet Durability Standard\u003c\/h3\u003e\n\u003cp\u003eFull-size GM utility vehicles subjected to heavy payload hauling and continuous towing rely on precise stoichiometric feedback to keep exhaust gas temperatures in check. Refreshing both upstream and downstream banks simultaneously preserves catalytic converter health and protects low-end towing torque.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67551264407800,"sku":"DS-EDEQT7WMK","price":79.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-chevrolet-tahoe-2015-2018-5-3l-6-2l-1.jpg?v=1790794270","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-chevrolet-tahoe-2015-2018-5-3l-6-2l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}