{"product_id":"o2-oxygen-sensor-upstream-downstream-for-gmc-yukon-xl-2015-2018-5-3l-6-2l","title":"O2 Oxygen Sensor Upstream Downstream for GMC Yukon XL (2015-2018) 5.3L, 6.2L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Upstream and Downstream Oxygen Sensor Kit for 2015-2018 GMC Yukon (K2XX)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The 4-piece oxygen sensor kit restores closed-loop AFR feedback and catalyst monitoring on the 2015-2018 GMC Yukon to resolve diagnostic trouble codes and restore stoichiometric fuel economy.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock GMC Yukon Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eFactory zirconia O2 sensors on the \u003cstrong\u003eK2XX\u003c\/strong\u003e platform suffer from gradual thermal fatigue and particulate fouling over extended mileage. In the direct-injected \u003cstrong\u003eEcoTec3\u003c\/strong\u003e V8 architectures (\u003cstrong\u003eL83\u003c\/strong\u003e and \u003cstrong\u003eL86\u003c\/strong\u003e), carbon soot, unburned hydrocarbons, and continuous exhaust gas heat degrade the internal ceramic sensing element and heating circuits. This causes lazy voltage switching between lean and rich cycles, throwing fault codes such as P0131, P0137, P0151, P0420, or P0430, forcing the ECM into safe-mode rich fuel trims that ruin fuel mileage and foul spark plugs.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis 4-piece replacement set refreshes both upstream wideband\/air-fuel or heated sensors and downstream post-cat monitoring positions simultaneously. Built with fast-acting planar ceramic heating elements, double-laser-welded stainless steel protective shielding, and pre-applied anti-seize on the threads, these sensors deliver rapid light-off and steady mV response across extreme exhaust gas temperatures. Factory-terminated OEM-style pigtail harness connectors eliminate wire splicing, ensuring direct OE pin-to-pin communication with the vehicle ECU.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2 x 234-4940 Oxygen Sensors\u003c\/li\u003e\n  \u003cli\u003e2 x 234-4974 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;\"\u003e2015-2018 GMC Yukon \/ Yukon XL\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;\"\u003e5.3L L83, 6.2L L86 EcoTec3 \/ K2XX\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;\"\u003e355-420 hp \/ 383-460 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;\"\u003e234-4940, 234-4974, 12657188, 12659516, 234-8081, 234-8088, 12627139, 12643707, 12643708, 12645561, 12655677, 12655678, 12661898, 12665162, 12666612, 12666673, 55569902, 21074, 21075, 21579, 21581, 234-4763, 2344763, 2344940, 2344974, 234-8052, 2348052\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\u003e2015-2018 GMC Yukon 5.3L V8\u003c\/li\u003e\n  \u003cli\u003e2015-2018 GMC Yukon 6.2L V8\u003c\/li\u003e\n  \u003cli\u003e2015-2018 GMC Yukon XL 5.3L V8\u003c\/li\u003e\n  \u003cli\u003e2015-2018 GMC Yukon XL 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 K2XX Yukon?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2015-2018 GMC Yukon equipped with the \u003cstrong\u003e5.3L L83\u003c\/strong\u003e and \u003cstrong\u003e6.2L L86\u003c\/strong\u003e EcoTec3 engines.\u003c\/p\u003e\n\n\u003ch4\u003eDo I need special tools or PCM recalibration after installation?\u003c\/h4\u003e\n\u003cp\u003eNo calibration tune is required, but an O2 sensor socket (7\/8-inch \/ 22mm) is strongly recommended for removal and torquing to OE specs.\u003c\/p\u003e\n\n\u003ch3\u003eThe GMC Heavy-Duty Reliability\u003c\/h3\u003e\n\u003cp\u003eFull-size GM SUV platforms demand accurate feedback to protect catalytic converters under heavy towing conditions, ensuring peak engine efficiency and consistent pulling torque mile after mile.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67551277416696,"sku":"DS-EU8LNG25V","price":79.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-gmc-yukon-xl-2015-2018-5-3l-6-2l-1.jpg?v=1790794369","url":"https:\/\/performancechiptuning.com\/es\/products\/o2-oxygen-sensor-upstream-downstream-for-gmc-yukon-xl-2015-2018-5-3l-6-2l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}