{"product_id":"o2-oxygen-sensor-upstream-downstream-for-ford-c-max-2014-2018-2-0l-hybrid","title":"O2 Oxygen Sensor Upstream Downstream for Ford C-Max (2014-2018) 2.0L Hybrid","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 2014-2018 Ford C-Max (C344)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This matched upstream and downstream O2 sensor kit monitors exhaust oxygen on the 2014-2018 Ford C-Max (\u003cstrong\u003eC344\u003c\/strong\u003e) \u003cstrong\u003e2.0L Atkinson-Cycle Hybrid\u003c\/strong\u003e to regulate closed-loop fuel trim and catalyst efficiency.\u003c\/p\u003e\u003ch3\u003eThe Stock Ford C-Max Sensor Failure\u003c\/h3\u003e\u003cp\u003eOn the \u003cstrong\u003eC344\u003c\/strong\u003e chassis with the \u003cstrong\u003e2.0L Atkinson-Cycle Hybrid\u003c\/strong\u003e powertrain, frequent engine start-stop cycles create severe thermal cycling and exhaust condensation inside the manifold. Over time, thermal shock fractures the internal ceramic zirconia element while carbon soot fouls the platinum electrodes. Heater element burnout also triggers \u003cstrong\u003eP0135\u003c\/strong\u003e or \u003cstrong\u003eP0141\u003c\/strong\u003e faults, and sluggish sensor switching sets \u003cstrong\u003eP0133\u003c\/strong\u003e or false \u003cstrong\u003eP0420\u003c\/strong\u003e catalyst 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 \/ DTCs:\u003c\/strong\u003e Triggers \u003cstrong\u003eP0133\u003c\/strong\u003e (slow response), \u003cstrong\u003eP0135\u003c\/strong\u003e\/\u003cstrong\u003eP0141\u003c\/strong\u003e (heater circuit), or \u003cstrong\u003eP0420\u003c\/strong\u003e due to degraded voltage switching.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSkewed Fuel Trim:\u003c\/strong\u003e Fouled elements corrupt PCM air-fuel calculations, causing rich operation and spark plug fouling.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReduced Hybrid MPG:\u003c\/strong\u003e Delayed warm-up keeps the \u003cstrong\u003e2.0L Atkinson-Cycle Hybrid\u003c\/strong\u003e in open-loop enrichment, failing emissions readiness.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Direct-Fit Planar Zirconia Sensor Solution\u003c\/h3\u003e\u003cp\u003eThis direct-fit upstream and downstream kit replaces \u003cstrong\u003e234-5068\u003c\/strong\u003e and \u003cstrong\u003e234-4578\u003c\/strong\u003e as a matched pair for complete exhaust feedback restoration. Built with laser-welded stainless housings and planar zirconia elements, each sensor resists moisture ingress and thermal fatigue during hybrid ICE restarts. OEM-keyed weatherpack connectors and heat-sleeved leads allow plug-and-play installation without wire splicing, restoring rapid closed-loop lambda control across the exhaust stream.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 Upstream Oxygen Sensor (replaces \u003cstrong\u003e234-5068\u003c\/strong\u003e)\u003c\/li\u003e\n\u003cli\u003e1 Downstream Oxygen Sensor (replaces \u003cstrong\u003e234-4578\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;\"\u003e2014-2018 Ford C-Max\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;\"\u003e2.0L Atkinson-Cycle Hybrid \/ C344\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;\"\u003eSensor Architecture\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eWideband Upstream \u0026amp; Heated Narrowband 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;\"\u003e234-5068, 234-4578\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e2014-2018 Ford C-Max 2.0L Hybrid (Electric\/Gas, 2-Sensor System)\u003c\/li\u003e\n\u003cli\u003eNote: 2013 C-Max and Fusion 2.0L Hybrid are excluded; Lincoln MKZ 2.0L Hybrid uses a separate listing.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\u003ch4\u003eDoes this fit the C344 C-Max?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Fits the 2014-2018 Ford C-Max \u003cstrong\u003e2.0L Atkinson-Cycle Hybrid\u003c\/strong\u003e. \u003cstrong\u003eExcludes 2013 C-Max and Fusion 2.0L Hybrid models; confirm 2-sensor engine configuration before ordering.\u003c\/strong\u003e\u003c\/p\u003e\u003ch4\u003eWill this clear P0135, P0141, or P0420 codes?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes, for sensor faults.\u003c\/strong\u003e Replacing \u003cstrong\u003e234-5068\u003c\/strong\u003e and \u003cstrong\u003e234-4578\u003c\/strong\u003e clears heater and response codes; a persistent \u003cstrong\u003eP0420\u003c\/strong\u003e indicates catalyst failure.\u003c\/p\u003e\u003ch4\u003eAre connectors pre-wired for installation?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Both sensors feature OEM weatherpack plugs and coated threads, requiring only a 22mm O2 socket.\u003c\/p\u003e\u003ch3\u003eThe Ford Precision Emissions Standard\u003c\/h3\u003e\u003cp\u003eBuilt for hybrid thermal cycling, this matched kit restores PCM fuel-trim accuracy and CEL-free emissions compliance on your \u003cstrong\u003eC344\u003c\/strong\u003e.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68119241425144,"sku":"DS-EWQBDNULM","price":65.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-ford-c-max-2014-2018-2-0l-hybrid-1.jpg?v=1794717773","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-ford-c-max-2014-2018-2-0l-hybrid","provider":"Performance Chip Tuning","version":"1.0","type":"link"}