{"product_id":"o2-oxygen-sensor-upstream-downstream-for-jeep-liberty-2002-2012-2-4l-3-7l","title":"O2 Oxygen Sensor Upstream Downstream for Jeep Liberty (2002-2012) 2.4L, 3.7L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Upstream and Downstream O2 Oxygen Sensor Set for 2002-2012 Jeep Liberty (KJ \/ KK)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The 4-piece O2 Oxygen Sensor Set replaces aged factory exhaust lambda sensors on the 2002-2012 Jeep Liberty to restore closed-loop fuel trim precision, correct air-fuel ratios, and eliminate catalytic converter efficiency trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Jeep Liberty Heated Oxygen Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eFactory zirconia O2 sensors on the \u003cstrong\u003eJeep Liberty KJ\u003c\/strong\u003e and \u003cstrong\u003eKK\u003c\/strong\u003e platforms deteriorate after prolonged exposure to exhaust thermal cycles, oil blow-by, and carbon fouling. As internal sensing elements lose sensitivity, signal response times lag significantly. This sluggish feedback causes the powertrain control module (PCM) to miscalculate injector pulse widths, driving disproportionate fuel trim corrections. The result is unburned hydrocarbons, reduced gas mileage, engine stumbling, and persistent DTCs including \u003cstrong\u003eP0130\u003c\/strong\u003e, \u003cstrong\u003eP0161\u003c\/strong\u003e, \u003cstrong\u003eP0420\u003c\/strong\u003e, and \u003cstrong\u003eP0430\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered with dual-layer planar sensing elements and factory-matched internal heaters, this complete 4-sensor pack restores real-time exhaust gas monitoring. Each sensor features high-grade stainless steel housings to resist corrosion, precision-rolled M18 x 1.5 threads, and OE-spec wiring harnesses with correct weather-pack connectors to ensure clean pin fitment without splicing. Upstream sensors provide fast-switching stoichiometric data for tight air-fuel management, while downstream monitors accurately gauge catalytic reduction efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2 Upstream Oxygen Sensors\u003c\/li\u003e\n  \u003cli\u003e2 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;\"\u003e2002-2012 Jeep Liberty\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;\"\u003e2.4L PowerTech (EDZ) \/ 3.7L PowerTech (EKG) \/ KJ, KK\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;\"\u003e150-210 hp \/ 165-235 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\u003e234-4029\u003c\/strong\u003e, \u003cstrong\u003e234-4588\u003c\/strong\u003e, \u003cstrong\u003e234-4593\u003c\/strong\u003e, \u003cstrong\u003e234-4594\u003c\/strong\u003e, \u003cstrong\u003e234-4598\u003c\/strong\u003e, \u003cstrong\u003e234-4653\u003c\/strong\u003e, \u003cstrong\u003e234-4749\u003c\/strong\u003e, \u003cstrong\u003e234-4030\u003c\/strong\u003e, \u003cstrong\u003e234-4217\u003c\/strong\u003e, \u003cstrong\u003e234-4228\u003c\/strong\u003e, \u003cstrong\u003e234-4229\u003c\/strong\u003e, \u003cstrong\u003e234-4232\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\u003e2002-2005 Jeep Liberty 2.4L Inline-4 (KJ Chassis)\u003c\/li\u003e\n  \u003cli\u003e2002-2007 Jeep Liberty 3.7L V6 (KJ Chassis)\u003c\/li\u003e\n  \u003cli\u003e2008-2012 Jeep Liberty 3.7L V6 (KK Chassis)\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 KJ and KK Liberty?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2002-2012 Jeep Liberty equipped with the \u003cstrong\u003e2.4L\u003c\/strong\u003e or \u003cstrong\u003e3.7L PowerTech\u003c\/strong\u003e engines; always verify sensor wire lengths and factory pin counts prior to final assembly.\u003c\/p\u003e\n\n\u003ch4\u003eDo I need special tools or preparation to install these sensors?\u003c\/h4\u003e\n\u003cp\u003eUse a dedicated 7\/8-inch (22mm) slotted oxygen sensor socket, apply anti-seize strictly to the threads while keeping the sensing tip dry, and reset stored PCM adaptations after installation.\u003c\/p\u003e\n\n\u003ch3\u003eThe Jeep Off-Road Durability Standard\u003c\/h3\u003e\n\u003cp\u003eConstructed to handle harsh underbody conditions, high vibration, and extended trail use, these replacement sensors ensure consistent air-fuel calibration and reliable power delivery whether highway cruising or operating under heavy 4WD loads.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67907876421880,"sku":"DS-EQ28JQKIM","price":98.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-jeep-liberty-2002-2012-2-4l-3-7l-1.jpg?v=1793381166","url":"https:\/\/performancechiptuning.com\/fr\/products\/o2-oxygen-sensor-upstream-downstream-for-jeep-liberty-2002-2012-2-4l-3-7l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}