{"product_id":"o2-oxygen-sensor-upstream-downstream-for-chevrolet-suburban-2015-2018-5-3l","title":"O2 Oxygen Sensor Upstream Downstream for Chevrolet Suburban (2015-2018) 5.3L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Complete Oxygen Sensor Kit for 2015-2018 Chevrolet Suburban (K2XX)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The 4-piece oxygen sensor kit replaces degraded factory upstream and downstream sensors on the 2015-2018 Suburban to restore precise air-fuel ratio closed-loop feedback and eliminate emissions-related diagnostic trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Chevrolet Suburban Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eOver extended heat cycles and mileage, the factory zirconia ceramic sensing elements inside OEM sensors suffer from thermal fatigue, silicone contamination, and soot accumulation from the direct-injected \u003cstrong\u003eEcoTec3 L83\u003c\/strong\u003e engine. Degraded upstream sensors produce sluggish voltage switching between rich and lean states, forcing the ECU to add excess trim fuel, which dilutes engine oil and fouls spark plugs. Meanwhile, aging downstream units trigger false catalytic converter efficiency codes (P0420\/P0430) and degrade active fuel management operation under towing loads.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered to direct-fit OE specifications, this four-sensor package utilizes dual-layer protective planar technology with porous polytetrafluoroethylene (PTFE) filters to repel moisture, exhaust soot, and oil contaminants. The integrated high-output ceramic heater rapidly brings both pre-cat and post-cat elements to operational temperature within seconds, ensuring instantaneous closed-loop ECU management. Featuring factory-style pigtails, direct-fit weatherpack connectors, and pre-coated high-temperature anti-seize threads, these sensors directly swap with OEM units \u003cstrong\u003e12657188\u003c\/strong\u003e and \u003cstrong\u003e12659516\u003c\/strong\u003e without wire splicing or pinning.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2 x Upstream Oxygen Sensors (Part # 234-4940)\u003c\/li\u003e\n  \u003cli\u003e2 x Downstream Oxygen Sensors (Part # 234-4974)\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: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\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 Suburban\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;\"\u003e\n\u003cstrong\u003e5.3L EcoTec3 L83 V8\u003c\/strong\u003e \/ \u003cstrong\u003eK2XX\u003c\/strong\u003e\n\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 hp \/ 383 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 Chevrolet Suburban 5.3L V8 (LS, LT, LTZ)\u003c\/li\u003e\n  \u003cli\u003e2016 Chevrolet Suburban 5.3L V8 (LS, LT, LTZ)\u003c\/li\u003e\n  \u003cli\u003e2017 Chevrolet Suburban 5.3L V8 (LS, LT, Premier)\u003c\/li\u003e\n  \u003cli\u003e2018 Chevrolet Suburban 5.3L V8 (LS, LT, Premier)\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 Suburban?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2015-2018 Chevrolet Suburban equipped with the \u003cstrong\u003e5.3L EcoTec3 L83\u003c\/strong\u003e engine; confirm your vehicle is equipped with the 5.3L engine prior to purchase as 6.2L configurations may use distinct harness lengths.\u003c\/p\u003e\n\n\u003ch4\u003eShould all four oxygen sensors be replaced at the same time?\u003c\/h4\u003e\n\u003cp\u003eYes, replacing upstream and downstream units simultaneously ensures uniform sensor response rates, balanced bank-to-bank fuel trim corrections, and prevents false post-installation catalyst monitoring DTCs.\u003c\/p\u003e\n\n\u003ch3\u003eThe Chevrolet Durability Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt to handle sustained highway towing, high-exhaust thermal loads, and heavy utility duties, these robust sensors safeguard your Suburban's towing capability and engine longevity under continuous load.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67551258181880,"sku":"DS-E3MGSQSF4","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-suburban-2015-2018-5-3l-1.jpg?v=1790794231","url":"https:\/\/performancechiptuning.com\/de\/products\/o2-oxygen-sensor-upstream-downstream-for-chevrolet-suburban-2015-2018-5-3l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}