{"product_id":"o2-oxygen-sensor-upstream-downstream-for-nissan-frontier-2005-2012-2-5l","title":"O2 Oxygen Sensor Upstream Downstream for Nissan Frontier (2005-2012) 2.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eDirect-Fit Upstream \u0026amp; Downstream Oxygen Sensor Kit for 2005-2012 Nissan Frontier (D40)\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e This matched upstream and downstream O2 sensor kit monitors exhaust oxygen content on the 2005-2012 Nissan Frontier \u003cstrong\u003eD40\u003c\/strong\u003e \u003cstrong\u003eQR25DE 2.5L\u003c\/strong\u003e to regulate air-fuel ratios and verify catalytic converter efficiency.\u003c\/p\u003e\u003ch3\u003eThe Stock Nissan Frontier O2 Sensor Failure\u003c\/h3\u003e\u003cp\u003eFactory oxygen sensors on the \u003cstrong\u003eD40\u003c\/strong\u003e chassis endure extreme exhaust thermal cycling and carbon soot buildup right off the manifold. Over time, internal zirconia-ceramic sensing elements develop micro-fractures, while integrated heater circuits burn out from constant electrical load and heat soak. On the \u003cstrong\u003eQR25DE 2.5L\u003c\/strong\u003e engine, degraded upstream air-fuel ratio reporting forces the ECM into sluggish closed-loop fueling or rich trims, triggering \u003cstrong\u003eP2A00\u003c\/strong\u003e, \u003cstrong\u003eP0130\u003c\/strong\u003e, or downstream catalyst code \u003cstrong\u003eP0420\u003c\/strong\u003e.\u003c\/p\u003e\u003ch4\u003eCommon Symptoms of a Failing OEM O2 Sensor\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck Engine Light \/ DTCs:\u003c\/strong\u003e Triggers \u003cstrong\u003eP2A00\u003c\/strong\u003e, \u003cstrong\u003eP0130\u003c\/strong\u003e, \u003cstrong\u003eP0138\u003c\/strong\u003e, or \u003cstrong\u003eP0420\u003c\/strong\u003e from slow switching or heater failure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePoor Fuel Economy:\u003c\/strong\u003e Skewed upstream feedback forces rich trims, rough idle, and throttle hesitation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFailed Emissions:\u003c\/strong\u003e Faulty downstream readings block OBD-II readiness monitors from completing.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eThe Direct-Fit Heated O2 Sensor Solution\u003c\/h3\u003e\u003cp\u003eThis direct-fit upstream and downstream oxygen sensor kit restores crisp closed-loop fuel trim feedback and accurate catalytic converter monitoring across the \u003cstrong\u003eD40\u003c\/strong\u003e platform. Each sensor utilizes a laser-welded \u003cstrong\u003estainless steel housing\u003c\/strong\u003e, anti-seize coated threads, and fast-acting planar ceramic elements resistant to thermal shock and exhaust contamination. Factory-matched weather-sealed connectors and OEM-length harnesses eliminate splicing, restoring proper voltage switching and lambda feedback for the \u003cstrong\u003eQR25DE 2.5L\u003c\/strong\u003e.\u003c\/p\u003e\u003ch3\u003eWhat's Included\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1x Upstream Air-Fuel Ratio (O2) Sensor\u003c\/li\u003e\n\u003cli\u003e1x Downstream Oxygen (O2) 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;\"\u003e2005-2012 Nissan Frontier\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;\"\u003eQR25DE 2.5L I4 \/ D40\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;\"\u003e1 Upstream Air-Fuel Ratio Sensor + 1 Downstream Heated O2 Sensor\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\u003c\/table\u003e\u003c\/div\u003e\u003ch3\u003eCompatibility\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e2005-2012 Nissan Frontier 2.5L I4 (\u003cstrong\u003eQR25DE\u003c\/strong\u003e \/ \u003cstrong\u003eD40\u003c\/strong\u003e) — Uses 1 Upstream Air-Fuel Ratio Sensor \u0026amp; 1 Downstream Oxygen Sensor\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\u003ch4\u003eDoes this fit the D40 Frontier?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes.\u003c\/strong\u003e This is a direct fit for the 2005-2012 Nissan Frontier equipped with the \u003cstrong\u003eQR25DE 2.5L\u003c\/strong\u003e engine. \u003cstrong\u003eExcludes 4.0L V6 (VQ40DE) models; confirm engine size before ordering.\u003c\/strong\u003e\u003c\/p\u003e\u003ch4\u003eWill replacing both sensors clear P2A00 and P0420 codes?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eYes, if sensor-related.\u003c\/strong\u003e Replacing the matched upstream and downstream set restores proper lambda and catalyst voltage feedback on the \u003cstrong\u003eD40\u003c\/strong\u003e after clearing ECM fault memory.\u003c\/p\u003e\u003ch4\u003eIs splicing or cutting required for installation?\u003c\/h4\u003e\u003cp\u003e\u003cstrong\u003eNo.\u003c\/strong\u003e Both sensors feature factory-style weather-sealed connectors and OEM harness lengths for plug-and-play installation.\u003c\/p\u003e\u003ch3\u003eThe Nissan Heavy-Duty Standard\u003c\/h3\u003e\u003cp\u003eBuilt for truck-grade thermal durability, these sensors withstand prolonged exhaust heat during towing and daily driving. Keep your \u003cstrong\u003eD40\u003c\/strong\u003e Frontier running clean, fuel-efficient, and free of nuisance check engine lights.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":68119396909304,"sku":"DS-EE2IGHYZL","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-nissan-frontier-2005-2012-2-5l-1.jpg?v=1794720041","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-downstream-for-nissan-frontier-2005-2012-2-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}