{"product_id":"o2-oxygen-sensor-upstream-downstream-for-chevrolet-impala-2014-2020-3-6l","title":"O2 Oxygen Sensor Upstream Downstream for Chevrolet Impala (2014-2020) 3.6L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit 4-Piece Oxygen Sensor Kit for 2014-2020 Chevrolet Impala (Epsilon II)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The direct-fit oxygen sensor kit monitors pre- and post-catalytic exhaust gas oxygen content on the 2014-2020 Chevrolet Impala to maintain stoichiometric air-fuel ratios, lower emissions, and eliminate check engine diagnostics.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Chevrolet Impala Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eOn the GM \u003cstrong\u003e3.6L LFX\u003c\/strong\u003e V6, factory planar sensors are exposed to extreme thermal cycling and combustion byproducts within the exhaust manifold and catalytic downpipes. Over time, internal zirconia ceramic elements glaze from carbon and fuel additives, while the internal heating circuits succumb to thermal fatigue. This degradation causes sluggish millivolt switching times, forcing the engine control module into skewed fuel trims, reduced fuel economy, rough idle, and persistent diagnostic trouble codes like P0131, P0137, P0420, or P0430.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis four-sensor complete replacement package restores precise closed-loop ECM feedback across Bank 1 and Bank 2. Built with double-shielded, laser-welded stainless steel housings, these sensors resist thermal shock, moisture intrusion, and corrosion. Internal fast-acting ceramic heater substrates reach operational light-off temperature in seconds, reducing cold-start emissions. Each sensor features direct-fit weatherproof harness plugs and factory-correct pigtail lengths, eliminating splicing and matching OEM specifications for numbers such as \u003cstrong\u003e12590035\u003c\/strong\u003e and \u003cstrong\u003e234-4566\u003c\/strong\u003e.\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;\"\u003e2014-2020 Chevrolet Impala\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;\"\u003e3.6L LFX V6 \/ Epsilon II\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;\"\u003e305 hp \/ 264 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;\"\u003eS4-4565, 234-4566, 12590035, 12597449, 12616203, 12634064, 2344818, 12596688, 12634085, 12640453, 1821378J10, 2344259, 2344840\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\u003e2014-2020 Chevrolet Impala 3.6L V6 (LS, LT, Premier)\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 Epsilon II Impala?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2014-2020 Chevrolet Impala equipped with the 3.6L LFX engine. \u003cstrong\u003eThis kit is exclusively for 3.6L V6 models and does not fit 2.5L 4-cylinder or legacy Impala Limited models.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eDo these sensors require wire splicing or adapter harnesses?\u003c\/h4\u003e\n\u003cp\u003eNo, these sensors feature factory-style keyed connectors and specific wire lengths for direct, plug-and-play installation into the stock wiring harness.\u003c\/p\u003e\n\n\u003ch3\u003eThe Chevrolet Caliber\u003c\/h3\u003e\n\u003cp\u003eMaintain the refinement and peak power delivery of your high-output V6. Replacing O2 sensors in full sets guarantees balanced bank-to-bank fuel metering, preserving downstream catalytic converters and ensuring smooth, efficient power across the entire RPM band.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67551494406392,"sku":"DS-EH85F7KS2","price":89.95,"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-impala-2014-2020-3-6l-1.jpg?v=1790797456","url":"https:\/\/performancechiptuning.com\/fr\/products\/o2-oxygen-sensor-upstream-downstream-for-chevrolet-impala-2014-2020-3-6l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}