{"product_id":"o2-oxygen-sensor-upstream-downstream-for-chevrolet-silverado-1500-tahoe-2003-2005-4-8l","title":"O2 Oxygen Sensor Upstream Downstream for Chevrolet Silverado 1500, Tahoe (2003-2005) 4.8L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Replacement Oxygen Sensor Set for 2003-2005 Chevrolet Silverado 1500, Tahoe (GMT800)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The 4-piece O2 Oxygen Sensor Set replaces degraded upstream and downstream exhaust sensors on the 2003-2005 Silverado 1500 and Tahoe to restore precise closed-loop fueling and eliminate diagnostic trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Chevrolet Silverado 1500, Tahoe Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eOver thousands of heat cycles, the factory zirconia ceramic thimbles in the \u003cstrong\u003eGMT800\u003c\/strong\u003e exhaust stream become poisoned by carbon buildup, unburnt hydrocarbons, and silica deposits. On the \u003cstrong\u003e4.8L LR4 Vortec\u003c\/strong\u003e V8, aged sensors suffer from sluggish millivolt switching speeds and open-loop heater circuit failures. This latency prevents the powertrain control module (PCM) from calculating accurate short-term fuel trims, inducing engine hesitation, unmetered rich running conditions, reduced fuel economy, and persistent check engine lights (DTCs P0130–P0161 and P0420\/P0430).\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis 4-sensor package provides a complete refresh engineered to match factory response curves. Constructed with fast-acting planar ceramic heating elements and durable stainless steel sensor housings, these sensors resist thermal shock and high exhaust gas temperatures. Each sensor matches OEM specification \u003cstrong\u003e234-4407\u003c\/strong\u003e with correct harness lengths and factory-style weatherproof pin terminals, eliminating the need for wire cutting or splicing while restoring accurate closed-loop stoichiometry and emissions compliance.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2 Upstream Oxygen Sensors (Pre-Catalytic Converter)\u003c\/li\u003e\n  \u003cli\u003e2 Downstream Oxygen Sensors (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;\"\u003e2003-2005 Chevrolet Silverado 1500, Tahoe\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;\"\u003e4.8L LR4 Vortec \/ GMT800\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;\"\u003e285 hp \/ 295 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\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\u003e2003-2005 Chevrolet Silverado 1500 4.8L V8\u003c\/li\u003e\n  \u003cli\u003e2003-2005 Chevrolet Tahoe 4.8L 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 GMT800 Silverado 1500, Tahoe?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2003-2005 Chevrolet Silverado 1500 and Tahoe equipped with the \u003cstrong\u003e4.8L LR4\u003c\/strong\u003e engine; verify your specific harness connector profile before installation.\u003c\/p\u003e\n\n\u003ch4\u003eShould anti-seize compound be used during installation?\u003c\/h4\u003e\n\u003cp\u003eApply high-temperature anti-seize exclusively to the sensor threads while keeping the protective probe tip clean and free from any chemical contamination.\u003c\/p\u003e\n\n\u003ch3\u003eThe Chevrolet Truck Standard\u003c\/h3\u003e\n\u003cp\u003eHeavy hauling and severe duty cycles demand steady fueling calibration; restoring all four oxygen sensors guarantees that your Silverado or Tahoe maintains maximum towing torque, correct catalytic efficiency, and consistent fuel economy across any payload.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67910902415608,"sku":"DS-EBP2YG0RB","price":90.95,"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-1500-tahoe-2003-2005-4-8l-1.jpg?v=1793393071","url":"https:\/\/performancechiptuning.com\/fr\/products\/o2-oxygen-sensor-upstream-downstream-for-chevrolet-silverado-1500-tahoe-2003-2005-4-8l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}