{"product_id":"o2-oxygen-sensor-downstream-for-chevrolet-silverado-1500-tahoe-avalanche-2008-2013-4-8l-5-3l-6-0l-6-2l","title":"O2 Oxygen Sensor Downstream for Chevrolet Silverado 1500, Tahoe, Avalanche (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 Downstream Oxygen Sensor Pair for 2008-2013 Chevrolet Silverado 1500, Tahoe, Avalanche (GMT900)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The downstream oxygen sensor set monitors catalytic converter efficiency on the 2008-2013 Silverado 1500, Tahoe, and Avalanche to eliminate false check engine lights and verify proper post-catalytic exhaust scrubbing.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Chevrolet Silverado 1500, Tahoe, Avalanche Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eFactory planar zirconia oxygen sensors on high-mileage \u003cstrong\u003eGMT900\u003c\/strong\u003e trucks inevitably suffer from internal heater circuit fatigue and sensor thimble contamination from oil vapor, fuel additives, and extreme exhaust gas thermal cycling. As sensor responsiveness drops, the powertrain control module fails to evaluate catalytic converter efficiency accurately, generating persistent DTC fault codes such as \u003cstrong\u003eP0420\u003c\/strong\u003e, \u003cstrong\u003eP0430\u003c\/strong\u003e, or \u003cstrong\u003eP0136\u003c\/strong\u003e through \u003cstrong\u003eP0161\u003c\/strong\u003e, forcing the vehicle into suboptimal emissions failsafe routines and failing state OBD-II inspections.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis downstream oxygen sensor pair restores precise emissions monitoring using dual-layer ceramic sensing elements housed within corrosion-resistant 304 stainless steel casings. Engineered to meet strict factory response thresholds, each sensor features factory-calibrated pigtail harness lengths and OEM-spec sealed terminal connectors that plug directly into the factory loom without splicing. Precision threads install directly into factory exhaust bungs, providing rapid light-off response times and dependable millivolt data transmission directly to the \u003cstrong\u003eGen IV\u003c\/strong\u003e engine control module.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2x Downstream Oxygen Sensors (Bank 1 and Bank 2 Post-Catalytic Converter)\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;\"\u003e2008-2013 Chevrolet Silverado 1500, Tahoe, Avalanche\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 V8 \/ 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;\"\u003e234-4407, 234-4256, 12609457, 12611165, 92457789\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 Chevrolet Silverado 1500 (4.8L, 5.3L, 6.0L, 6.2L V8)\u003c\/li\u003e\n  \u003cli\u003e2008-2013 Chevrolet Tahoe (4.8L, 5.3L, 6.2L V8)\u003c\/li\u003e\n  \u003cli\u003e2008-2013 Chevrolet Avalanche (5.3L, 6.0L V8)\u003c\/li\u003e\n  \u003cli\u003e2008-2014 Cadillac Escalade \u0026amp; Escalade ESV (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 Silverado 1500, Tahoe, Avalanche?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2008-2013 Chevrolet Silverado 1500, Tahoe, and Avalanche equipped with the \u003cstrong\u003eGen IV Small Block\u003c\/strong\u003e 4.8L, 5.3L, 6.0L, and 6.2L V8 engines in the downstream positions.\u003c\/p\u003e\n\n\u003ch4\u003eWhat tools and precautions are required for installation?\u003c\/h4\u003e\n\u003cp\u003eUse a dedicated 22mm (7\/8-inch) slotted oxygen sensor socket, apply high-temperature anti-seize strictly to the threads while keeping the protective sensor thimble clean, and clear ECM trouble codes with a scan tool post-installation.\u003c\/p\u003e\n\n\u003ch3\u003eThe Chevrolet Durability Standard\u003c\/h3\u003e\n\u003cp\u003eConstructed to endure severe exhaust vibration, heavy payload demands, and sustained towing conditions, these replacement sensors deliver reliable closed-loop communication for uninterrupted truck duty cycles.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67911057375480,"sku":"DS-EJSXX4WC2","price":80.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-downstream-for-chevrolet-silverado-1500-tahoe-avalanche-2008-2013-4-8l-5-3l-6-0l-6-2l-1.jpg?v=1793394289","url":"https:\/\/performancechiptuning.com\/fr\/products\/o2-oxygen-sensor-downstream-for-chevrolet-silverado-1500-tahoe-avalanche-2008-2013-4-8l-5-3l-6-0l-6-2l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}