{"product_id":"o2-oxygen-sensor-upstream-downstream-for-mitsubishi-eclipse-2006-2012-3-8l","title":"O2 Oxygen Sensor Upstream Downstream for Mitsubishi Eclipse (2006-2012) 3.8L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Upstream \u0026amp; Downstream O2 Oxygen Sensor Kit for 2006-2012 Mitsubishi Eclipse (DK4A)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This 4-piece upstream and downstream oxygen sensor kit monitors pre- and post-catalyst exhaust oxygen content on the 2006-2012 Mitsubishi Eclipse \u003cstrong\u003eDK4A\u003c\/strong\u003e equipped with the \u003cstrong\u003e6G75 3.8L V6\u003c\/strong\u003e to maintain closed-loop air-fuel ratio accuracy and catalytic converter efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Mitsubishi Eclipse Oxygen Sensor Failure\u003c\/h3\u003e\n\u003cp\u003eOn the \u003cstrong\u003eDK4A\u003c\/strong\u003e chassis powered by the \u003cstrong\u003e6G75 3.8L V6\u003c\/strong\u003e, factory zirconia oxygen sensors endure continuous thermal cycling, exhaust soot, and moisture condensation. Over time, internal heater elements burn out and platinum electrodes suffer silicone or oil fouling, slowing voltage switching speed. When Bank 1 or Bank 2 upstream sensors lag, the ECU defaults to rich open-loop fuel maps, while degraded downstream sensors trigger catalyst efficiency faults like \u003cstrong\u003eP0420\/P0430\u003c\/strong\u003e or heater circuit codes \u003cstrong\u003eP0135\u003c\/strong\u003e and \u003cstrong\u003eP0155\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch4\u003eCommon Symptoms of a Failing OEM Oxygen Sensor\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCheck Engine Light \/ DTCs:\u003c\/strong\u003e Triggers slow-response, heater circuit, or catalyst codes such as \u003cstrong\u003eP0134\u003c\/strong\u003e, \u003cstrong\u003eP0154\u003c\/strong\u003e, \u003cstrong\u003eP0135\u003c\/strong\u003e, \u003cstrong\u003eP0155\u003c\/strong\u003e, and \u003cstrong\u003eP0420\/P0430\u003c\/strong\u003e due to degraded voltage switching.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eErratic Fuel Trims \u0026amp; Hesitation:\u003c\/strong\u003e Sluggish upstream feedback forces excessive short-term and long-term fuel trim corrections, causing rough idle and bogging under load.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFailed Emissions \u0026amp; Fuel Waste:\u003c\/strong\u003e Prolonged open-loop enrichment spikes tailpipe hydrocarbons, accelerates catalytic converter overheating, and reduces fuel economy.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Direct-Fit Upstream \u0026amp; Downstream Oxygen Sensor Solution\u003c\/h3\u003e\n\u003cp\u003eReplacing all four sensors simultaneously as a matched set restores balanced Bank 1 and Bank 2 feedback across both cylinder heads. These direct-fit heated zirconia sensors feature laser-welded stainless steel housings, dual-layer porous PTFE protective filters against exhaust contaminants, and precision-wound internal heaters for rapid light-off. Built with factory-length leads and weather-sealed OEM-style connectors, each sensor replaces \u003cstrong\u003e234-4318\u003c\/strong\u003e, \u003cstrong\u003e234-4656\u003c\/strong\u003e, \u003cstrong\u003e234-4738\u003c\/strong\u003e, and \u003cstrong\u003e234-4739\u003c\/strong\u003e with zero wire splicing.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2 Upstream Oxygen Sensors (Bank 1 \u0026amp; Bank 2)\u003c\/li\u003e\n  \u003cli\u003e2 Downstream Oxygen Sensors (Bank 1 \u0026amp; Bank 2)\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;\"\u003e2006-2012 Mitsubishi Eclipse\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;\"\u003e6G75 3.8L V6 \/ DK4A\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;\"\u003eEmissions \u0026amp; Sensing Element\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e4-Wire Heated Zirconia (2 Upstream, 2 Downstream)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eInstallation Type\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eDirect Bolt-On OEM Replacement (No Cutting or Welding)\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;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e234-4318, 234-4656, 234-4738, 234-4739\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\u003e2006-2012 Mitsubishi Eclipse 3.8L V6 (including 2011; 4-sensor setup: 2 upstream, 2 downstream)\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 DK4A Eclipse?\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e This is a direct fit for the 2006-2012 Mitsubishi Eclipse equipped with the \u003cstrong\u003e6G75 3.8L V6\u003c\/strong\u003e engine, including the 2011 model year. \u003cstrong\u003eExcludes 2.4L 4-cylinder Eclipse models and Mitsubishi Galant applications; always confirm your 3.8L V6 engine before ordering.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eWill replacing all four sensors clear P0135, P0155, or P0420\/P0430 codes?\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eYes, when the fault stems from degraded oxygen sensors.\u003c\/strong\u003e Installing this matched kit resolves heater circuit and slow-response DTCs like \u003cstrong\u003eP0135\u003c\/strong\u003e and \u003cstrong\u003eP0155\u003c\/strong\u003e, though persistent \u003cstrong\u003eP0420\/P0430\u003c\/strong\u003e codes after replacement indicate an internally damaged catalytic converter substrate.\u003c\/p\u003e\n\n\u003ch4\u003eDo these sensors require wire splicing or special connectors for installation?\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eNo.\u003c\/strong\u003e Each sensor arrives with direct-fit OEM-style plug-and-play connectors and factory-cut threads, requiring only a standard 22mm (7\/8-inch) oxygen sensor socket and proper torque during installation.\u003c\/p\u003e\n\n\u003ch3\u003eThe Mitsubishi Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered for the \u003cstrong\u003e6G75\u003c\/strong\u003e V6 platform, this matched four-sensor kit restores crisp throttle response, balanced exhaust flow monitoring, and closed-loop fuel efficiency. Keep your Eclipse running clean and CEL-free with factory-grade ECU signal accuracy.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68119239459064,"sku":"DS-EG4LFUD8X","price":92.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-mitsubishi-eclipse-2006-2012-3-8l-1.jpg?v=1794717612","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-mitsubishi-eclipse-2006-2012-3-8l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}