{"product_id":"o2-oxygen-sensor-upstream-downstream-for-hyundai-elantra-2004-2009-2-0l","title":"O2 Oxygen Sensor Upstream Downstream for Hyundai Elantra (2004-2009) 2.0L","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 2004-2009 Hyundai Elantra (XD\/HD)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This matched upstream and downstream oxygen sensor kit monitors pre- and post-catalyst exhaust oxygen on 2004-2009 Hyundai Elantra (\u003cstrong\u003eXD\/HD\u003c\/strong\u003e) \u003cstrong\u003eG4GC 2.0L Beta II\u003c\/strong\u003e models for closed-loop fuel control.\u003c\/p\u003e\u003ch3\u003eThe Stock Hyundai Elantra Oxygen Sensor Failure\u003c\/h3\u003e\u003cp\u003eFactory oxygen sensors on the \u003cstrong\u003eXD\u003c\/strong\u003e and \u003cstrong\u003eHD\u003c\/strong\u003e chassis with the \u003cstrong\u003eG4GC 2.0L Beta II\u003c\/strong\u003e engine endure severe thermal cycling above 1,400°F alongside carbon and oil-vapor contamination. Over time, internal zirconia elements poison, heater circuits open, and sensor louvers clog with soot. These failures slow switching response, locking the ECU into rich fueling and triggering \u003cstrong\u003eP0130\u003c\/strong\u003e, \u003cstrong\u003eP0135\u003c\/strong\u003e, and \u003cstrong\u003eP0141\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 \u0026amp; Heater DTCs:\u003c\/strong\u003e Triggers \u003cstrong\u003eP0130\u003c\/strong\u003e, \u003cstrong\u003eP0135\u003c\/strong\u003e, or \u003cstrong\u003eP0141\u003c\/strong\u003e when voltage response lags or heater resistance fails.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRough Idle \u0026amp; Hesitation:\u003c\/strong\u003e Corrupted air-fuel feedback skews injector pulse widths, causing stumble under acceleration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Fuel Use \u0026amp; Emissions Failure:\u003c\/strong\u003e Rich open-loop operation spikes hydrocarbons, overheats the catalytic converter, and risks \u003cstrong\u003eP0420\u003c\/strong\u003e faults.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Direct-Fit Upstream \u0026amp; Downstream Oxygen Sensor Solution\u003c\/h3\u003e\u003cp\u003eThis matched sensor pair restores precise air-fuel metering using laser-welded \u003cstrong\u003estainless steel\u003c\/strong\u003e housings and double-layered protective shields that resist exhaust condensate shock. High-purity \u003cstrong\u003eceramic zirconia\u003c\/strong\u003e sensing elements deliver rapid heater warm-up and crisp millivolt switching for stoichiometric \u003cstrong\u003e14.7:1\u003c\/strong\u003e combustion under load. Each direct-fit assembly features OEM weatherproof connectors and pre-cut threads, replacing \u003cstrong\u003e234-5430\u003c\/strong\u003e, \u003cstrong\u003eSG1495\u003c\/strong\u003e, and \u003cstrong\u003eSG1485\u003c\/strong\u003e without cutting or splicing.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1 Upstream Oxygen Sensor\u003c\/li\u003e\n\u003cli\u003e1 Downstream Oxygen Sensor\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;\"\u003e2004-2009 Hyundai Elantra\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;\"\u003eG4GC 2.0L Beta II \/ XD \u0026amp; HD\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;\"\u003eUpstream \u0026amp; Downstream Heated Zirconia Elements (Direct-Fit)\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;\"\u003eSG1495, 234-5430, 24304, SG1485, 2133902, 15646, SG1695, TB3013503+120447\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e2004-2009 Hyundai Elantra 2.0L (Confirm engine before ordering)\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\u003ch4\u003eDoes this fit the XD\/HD Elantra?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e This is a direct fit for the 2004-2009 Hyundai Elantra equipped with the \u003cstrong\u003eG4GC 2.0L Beta II\u003c\/strong\u003e engine. \u003cstrong\u003eDoes not fit non-2.0L engines; confirm engine displacement before ordering.\u003c\/strong\u003e\u003c\/p\u003e\u003ch4\u003eWill this clear P0135, P0141, or fuel trim codes?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Replacing failed upstream and downstream sensors restores heater circuit integrity and rapid O2 switching, clearing \u003cstrong\u003eP0130\u003c\/strong\u003e, \u003cstrong\u003eP0135\u003c\/strong\u003e, and \u003cstrong\u003eP0141\u003c\/strong\u003e once the ECU completes drive-cycle verification.\u003c\/p\u003e\u003ch4\u003eAre factory connectors included for bolt-on installation?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e Both sensors come with direct-fit OEM plugs—apply anti-seize only to threads and torque to \u003cstrong\u003e30–37 lb-ft\u003c\/strong\u003e.\u003c\/p\u003e\u003ch3\u003eThe Hyundai Precision Standard\u003c\/h3\u003e\u003cp\u003eEngineered to factory tolerances, this matched sensor kit preserves closed-loop ECU accuracy and emissions compliance across daily driving. Maintain factory fuel economy and CEL-free operation on your \u003cstrong\u003eXD\/HD\u003c\/strong\u003e Elantra.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68114754142456,"sku":"DS-EZ1HKY4FE","price":69.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-downstream-for-hyundai-elantra-2004-2009-2-0l-1.jpg?v=1794698734","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-hyundai-elantra-2004-2009-2-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}