{"product_id":"o2-oxygen-sensor-upstream-downstream-for-chevrolet-silverado-2500-hd-2008-2011-6-0l","title":"O2 Oxygen Sensor Upstream Downstream for Chevrolet Silverado 2500 HD (2008-2011) 6.0L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit 4-Piece Oxygen Sensor Kit for 2008-2011 Chevrolet Silverado 2500 HD (GMT900)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The 4-piece direct-fit oxygen sensor kit monitors pre- and post-catalytic exhaust gas oxygen content on the 2008-2011 Silverado 2500 HD to restore precise closed-loop fueling and eliminate emissions-related trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Chevrolet Silverado Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eOn heavy-duty \u003cstrong\u003eGMT900\u003c\/strong\u003e trucks driven under continuous hauling cycles, the factory \u003cstrong\u003eLY6\u003c\/strong\u003e and \u003cstrong\u003eL96\u003c\/strong\u003e 6.0L oxygen sensors suffer from thermal fatigue, carbon wash, and internal heater element breakdown. As sensors surpass 80,000 to 100,000 miles, their switching speeds degrade significantly. This latency blinds the engine control module, driving erratic short-term fuel trims (STFT), diminished fuel efficiency, and recurring catalytic inefficiency or heater circuit diagnostic trouble codes (DTCs P0135, P0155, P0420, or P0430).\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered for high-duty thermal endurance, this complete 4-sensor set incorporates fast-acting planar ceramic zirconia elements protected by laser-welded stainless steel outer shanks. The internal rapid-heating circuits attain operational temperature within seconds, transitioning the engine quickly out of high-emissions open-loop mode. Featuring factory-keyed weather-pack electrical connectors and factory-length thermal-sleeved wiring harnesses, these sensors install directly without harness splicing, restoring crisp lambda feedback across both cylinder banks.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2x Upstream Oxygen Sensors\u003c\/li\u003e\n  \u003cli\u003e2x Downstream Oxygen Sensors\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;\"\u003e2008-2011 Chevrolet Silverado 2500 HD\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;\"\u003eLY6 \/ L96 6.0L Vortec \/ 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;\"\u003e353-360 hp \/ 373-380 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\u003e2008-2011 Chevrolet Silverado 2500 HD (6.0L 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 Silverado?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2008-2011 Chevrolet Silverado 2500 HD equipped with the \u003cstrong\u003eLY6\u003c\/strong\u003e or \u003cstrong\u003eL96\u003c\/strong\u003e 6.0L engine. \u003cstrong\u003eDoes not fit 6.6L Duramax turbo-diesel models or light-duty 1500 truck exhaust configurations.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eShould I reset fuel trim values after installing all four sensors?\u003c\/h4\u003e\n\u003cp\u003eYes, clearing active DTCs and resetting long-term fuel trim (LTFT) adaptive tables with a scan tool allows the PCM to immediately establish accurate fuel mapping.\u003c\/p\u003e\n\n\u003ch3\u003eThe Chevrolet Heavy-Duty Caliber\u003c\/h3\u003e\n\u003cp\u003eBuilt to handle severe commercial duty cycles and maximum towing strain, replacing all four worn sensors at once ensures balanced cylinder bank fueling, protected catalytic converters, and uncompromised pulling power.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67551211782392,"sku":"DS-ENACWCSSX","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-silverado-2500-hd-2008-2011-6-0l-1.jpg?v=1790793547","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-chevrolet-silverado-2500-hd-2008-2011-6-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}