{"product_id":"o2-oxygen-sensor-upstream-downstream-for-chevrolet-silverado-3500-hd-2008-2011-6-0l","title":"O2 Oxygen Sensor Upstream Downstream for Chevrolet Silverado 3500 HD (2008-2011) 6.0L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Upstream and Downstream Oxygen Sensor Kit for 2008-2011 Chevrolet Silverado 3500 HD (GMT900)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The 4-piece oxygen sensor kit replaces degraded factory lambda sensors on the 2008-2011 Silverado 3500 HD to restore closed-loop air-fuel ratio accuracy, resolve DTC check engine lights, and optimize heavy-duty towing fuel efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Chevrolet Silverado Sensor Degradation and Contamination\u003c\/h3\u003e\n\u003cp\u003eUnder heavy towing loads, the factory \u003cstrong\u003eLY6\u003c\/strong\u003e and \u003cstrong\u003eL96\u003c\/strong\u003e 6.0L V8 powertrains subject exhaust stream monitoring hardware to persistent thermal cycling and soot exposure. Over time, internal zirconia ceramic elements become coated with carbon, unburnt hydrocarbons, and silica deposits. This contamination leads to signal latency, false lean\/rich trims, catalyst inefficiency codes (such as P0420\/P0430), and degraded PCM closed-loop fuel metering, resulting in sluggish throttle response and poor fuel mileage under load.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive 4-piece replacement assembly provides matched upstream air-fuel ratio sensing and downstream catalyst monitoring. Manufactured with fast-activating internal ceramic planar elements and integrated heating circuits, each sensor rapidly reaches operating light-off temperature to reduce cold-start emissions. The assemblies incorporate dual-layer 304 stainless steel protective shields to resist thermal degradation and debris impingement, accompanied by pre-conditioned high-temperature wiring harnesses and factory-pinned weather-pack terminal connectors for clean, splice-free integration into the \u003cstrong\u003eGMT900\u003c\/strong\u003e platform.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e4PCS Upstream + Downstream Oxygen Sensors (Direct-Fit Kit)\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;\"\u003e2008-2011 Chevrolet Silverado 3500 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;\"\u003e6.0L Vortec (LY6\/L96) \/ 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 hp \/ 373 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;\"\u003e\n\u003cstrong\u003e21546\u003c\/strong\u003e, \u003cstrong\u003e234-4254\u003c\/strong\u003e, \u003cstrong\u003e234-4407\u003c\/strong\u003e, \u003cstrong\u003e234-4668\u003c\/strong\u003e, \u003cstrong\u003e15284\u003c\/strong\u003e, \u003cstrong\u003e2344254\u003c\/strong\u003e, \u003cstrong\u003e2344668\u003c\/strong\u003e, \u003cstrong\u003eES20013\u003c\/strong\u003e, \u003cstrong\u003eOS1656\u003c\/strong\u003e, \u003cstrong\u003eOS2239\u003c\/strong\u003e, \u003cstrong\u003eOS2240\u003c\/strong\u003e, \u003cstrong\u003eOS2249\u003c\/strong\u003e, \u003cstrong\u003eSG1857\u003c\/strong\u003e\n\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 3500 HD 6.0L V8 Gas\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 3500 HD equipped with the 6.0L V8 \u003cstrong\u003eLY6\u003c\/strong\u003e or \u003cstrong\u003eL96\u003c\/strong\u003e engine; verify your engine displacement prior to ordering, as it does not fit 6.6L Duramax diesel models.\u003c\/p\u003e\n\n\u003ch4\u003eDo I need to clear PCM fuel trims after installing these sensors?\u003c\/h4\u003e\n\u003cp\u003eYes, clearing existing diagnostic trouble codes and resetting adaptive long-term fuel trims with a scan tool ensures the ECM recalibrates immediately to the fresh sensor feedback.\u003c\/p\u003e\n\n\u003ch3\u003eThe Chevrolet Heavy-Duty Caliber\u003c\/h3\u003e\n\u003cp\u003eEngineered for high-strain fleet duty and heavy towing demands, these sensors deliver durable signal accuracy to protect catalytic converters and sustain continuous pulling power across grueling duty cycles.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67551215976696,"sku":"DS-EI03BFVK3","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-3500-hd-2008-2011-6-0l-1.jpg?v=1790793579","url":"https:\/\/performancechiptuning.com\/es\/products\/o2-oxygen-sensor-upstream-downstream-for-chevrolet-silverado-3500-hd-2008-2011-6-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}