{"product_id":"o2-oxygen-sensor-upstream-downstream-for-lincoln-mks-mkt-mkz-2013-2016-3-7l","title":"O2 Oxygen Sensor Upstream Downstream for Lincoln MKS MKT MKZ (2013-2016) 3.7L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Upstream \u0026amp; Downstream O2 Sensor Kit for 2013-2016 Lincoln MKS, MKT, MKZ (D3\/D4\/CD4)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This 4-piece oxygen sensor kit monitors exhaust oxygen on 2013-2016 Lincoln MKS, MKT, and MKZ \u003cstrong\u003e3.7L Ti-VCT V6\u003c\/strong\u003e models to restore closed-loop fuel trim.\u003c\/p\u003e\u003ch3\u003eThe Stock Lincoln MKS, MKT, MKZ Sensor Failure\u003c\/h3\u003e\u003cp\u003eFactory oxygen sensors on the \u003cstrong\u003eD3\u003c\/strong\u003e MKS, \u003cstrong\u003eD4\u003c\/strong\u003e MKT, and \u003cstrong\u003eCD4\u003c\/strong\u003e MKZ with the \u003cstrong\u003eDuratec 37 3.7L Ti-VCT V6\u003c\/strong\u003e endure severe, continuous exhaust heat cycling. Over time, internal heater coils suffer thermal fatigue while carbon and ash deposits poison the porous zirconia sensing core. This slows voltage switching and skews fuel trims, triggering \u003cstrong\u003eP0135\u003c\/strong\u003e, \u003cstrong\u003eP0155\u003c\/strong\u003e, or \u003cstrong\u003eP0420\/P0430\u003c\/strong\u003e fault codes.\u003c\/p\u003e\u003ch4\u003eCommon Symptoms of a Failing OEM Oxygen Sensor\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck Engine Light:\u003c\/strong\u003e Triggers heater or slow-response codes like \u003cstrong\u003eP0130\u003c\/strong\u003e, \u003cstrong\u003eP0135\u003c\/strong\u003e, \u003cstrong\u003eP0155\u003c\/strong\u003e, or \u003cstrong\u003eP0420\/P0430\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSluggish Response:\u003c\/strong\u003e Contaminated zirconia elements delay voltage switching, causing rough idle and erratic fuel trims.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoor Fuel Economy:\u003c\/strong\u003e Forces rich open-loop fueling, lowering mileage and failing emissions tests.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Direct-Fit Matched Oxygen Sensor Solution\u003c\/h3\u003e\u003cp\u003eThis matched 4-piece kit replaces OEM part numbers \u003cstrong\u003e234-5038\u003c\/strong\u003e and \u003cstrong\u003e234-4490\u003c\/strong\u003e across both exhaust banks simultaneously. Each sensor pairs a laser-welded stainless steel shell with a high-purity ceramic zirconia element and calibrated heater circuit for fast light-off and accurate voltage feedback. Direct-fit weather-pack connectors, OE harness lengths, and pre-coated threads bolt directly into stock bungs without wiring splicing.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e2 Upstream Oxygen Sensors (\u003cstrong\u003e234-5038\u003c\/strong\u003e)\u003c\/li\u003e\n\u003cli\u003e2 Downstream Oxygen Sensors (\u003cstrong\u003e234-4490\u003c\/strong\u003e)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\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;\"\u003e2013-2016 Lincoln MKS, MKT, MKZ\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;\"\u003e3.7L Ti-VCT V6 \/ D3, D4, CD4\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; Sensor Spec\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eDirect-Fit 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\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;\"\u003e234-5038, 234-4490\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e2013-2016 Lincoln MKS (\u003cstrong\u003eD3\u003c\/strong\u003e) \u003cstrong\u003e3.7L\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e2013-2016 Lincoln MKT (\u003cstrong\u003eD4\u003c\/strong\u003e) \u003cstrong\u003e3.7L\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e2013-2016 Lincoln MKZ (\u003cstrong\u003eCD4\u003c\/strong\u003e) \u003cstrong\u003e3.7L\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003ch4\u003eDoes this fit the D3, D4, and CD4 MKS, MKT, MKZ?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Fits 2013-2016 Lincoln MKS (\u003cstrong\u003eD3\u003c\/strong\u003e), MKT (\u003cstrong\u003eD4\u003c\/strong\u003e), and MKZ (\u003cstrong\u003eCD4\u003c\/strong\u003e) \u003cstrong\u003e3.7L Ti-VCT V6\u003c\/strong\u003e models. \u003cstrong\u003eExcludes 2.0L, 3.5L EcoBoost, and hybrid engines; confirm engine before ordering.\u003c\/strong\u003e\u003c\/p\u003e\u003ch4\u003eWill this fix P0135, P0155, or P0420\/P0430 codes?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes, if caused by sensor failure.\u003c\/strong\u003e New \u003cstrong\u003e234-5038\u003c\/strong\u003e upstream and \u003cstrong\u003e234-4490\u003c\/strong\u003e downstream sensors restore heater resistance and voltage waveforms when catalytic converters are intact.\u003c\/p\u003e\u003ch4\u003eIs wiring splicing required for installation?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eNo.\u003c\/strong\u003e All four sensors feature direct-fit factory connectors and pre-coated threads for plug-and-play installation.\u003c\/p\u003e\u003ch3\u003eThe Lincoln Precision Standard\u003c\/h3\u003e\u003cp\u003eBuilt for factory PCM calibration, this matched 4-sensor kit restores closed-loop fuel accuracy and CEL-free operation on your \u003cstrong\u003e3.7L Ti-VCT V6\u003c\/strong\u003e.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68116061126904,"sku":"DS-EG3SQ3VJ4","price":164.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-lincoln-mks-mkt-mkz-2013-2016-3-7l-1.jpg?v=1794710456","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-lincoln-mks-mkt-mkz-2013-2016-3-7l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}