{"product_id":"o2-oxygen-sensor-upstream-downstream-for-gmc-sierra-1500-2008-2013-4-8l-5-3l-6-0l-6-2l","title":"O2 Oxygen Sensor Upstream Downstream for GMC Sierra 1500 (2008-2013) 4.8L, 5.3L, 6.0L, 6.2L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Replacement Oxygen Sensor Kit for 2008-2013 GMC Sierra (GMT900)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The 4-piece oxygen sensor kit monitors pre- and post-catalyst exhaust gas composition on 2008-2013 GMC Sierra trucks to ensure precise closed-loop fueling and proper catalytic converter efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock GMC Sierra Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eFactory oxygen sensors on \u003cstrong\u003eGMT900\u003c\/strong\u003e platform trucks routinely succumb to continuous thermal cycling, carbon buildup, and oil-vapor contamination. Over extended mileage, the internal zirconia sensing elements foul and degrade, causing sluggish switching rates between lean and rich fuel states. In \u003cstrong\u003eGen IV Small Block\u003c\/strong\u003e V8 applications, a lazy or dead O2 sensor skews short- and long-term fuel trims (STFT\/LTFT), triggering fault codes such as P0135, P0155, or false P0420\/P0430 catalyst degradation codes, while degrading fuel economy and drivability under load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive 4-sensor package supplies matching upstream and downstream sensors engineered to restore factory air-fuel feedback loop speeds. Built with high-temperature stainless steel protective housings and robust ceramic zirconia sensing elements, these sensors resist soot fouling and thermal degradation. Direct-fit weather-pack harness connectors integrate cleanly with OEM harnesses, ensuring rapid heater circuit light-off, stable millivolt switching, and clean closed-loop engine management without custom wiring.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2x Upstream Oxygen Sensors (Bank 1 Sensor 1, Bank 2 Sensor 1)\u003c\/li\u003e\n  \u003cli\u003e2x Downstream Oxygen Sensors (Bank 1 Sensor 2, Bank 2 Sensor 2)\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;\"\u003e2008-2013 GMC Sierra 1500\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;\"\u003eGen IV Vortec (4.8L, 5.3L, 6.0L, 6.2L) \/ GMT900\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;\"\u003e295–403 hp \/ 305–417 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;\"\u003e21546, 234-4254, 234-4407, 234-4668, 15284, 2344254, 2344668, ES20013, OS1656, OS2239, OS2240, OS2249, SG1857\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\u003e2008-2013 GMC Sierra 1500 4.8L V8\u003c\/li\u003e\n  \u003cli\u003e2008-2013 GMC Sierra 1500 5.3L V8\u003c\/li\u003e\n  \u003cli\u003e2008-2013 GMC Sierra 1500 6.0L V8\u003c\/li\u003e\n  \u003cli\u003e2008-2013 GMC Sierra 1500 6.2L V8\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 GMT900 Sierra?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2008-2013 GMC Sierra 1500 equipped with the \u003cstrong\u003eGen IV Vortec\u003c\/strong\u003e V8 (4.8L, 5.3L, 6.0L, 6.2L) engines; verify harness plug configurations prior to installation as V6 models are excluded.\u003c\/p\u003e\n\n\u003ch4\u003eDo these sensors require wire splicing or aftermarket tuning?\u003c\/h4\u003e\n\u003cp\u003eNo, these direct-fit sensors utilize factory-style locking connectors and standard thread pitch for a plug-and-play installation without ECM calibration.\u003c\/p\u003e\n\n\u003ch3\u003eThe GMC Heavy-Duty Reliability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered for high-mileage work trucks subjected to sustained towing demands, this sensor kit restores reliable stoichiometric air-fuel control to maintain low emissions, steady idle, and peak hauling efficiency.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67551229706488,"sku":"DS-EWQGXG2SV","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-gmc-sierra-1500-2008-2013-4-8l-5-3l-6-0l-6-2l-1.jpg?v=1790793717","url":"https:\/\/performancechiptuning.com\/es\/products\/o2-oxygen-sensor-upstream-downstream-for-gmc-sierra-1500-2008-2013-4-8l-5-3l-6-0l-6-2l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}