{"product_id":"o2-oxygen-sensor-upstream-for-nissan-pathfinder-2008-2010-4-0l","title":"O2 Oxygen Sensor Upstream for Nissan Pathfinder (2008-2010) 4.0L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003ePrecision Upstream O2 Oxygen Sensor for 2008-2010 Nissan Pathfinder (R51)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Upstream O2 Oxygen Sensor monitors pre-catalytic exhaust gas oxygen concentrations on the 2008-2010 Nissan Pathfinder to provide real-time air-fuel ratio feedback to the engine control module for optimal combustion efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Nissan Pathfinder Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eFactory air-fuel ratio sensors in the \u003cstrong\u003eR51\u003c\/strong\u003e chassis suffer from thermal cycling fatigue and chemical contamination over extended mileage. Operating downstream of the \u003cstrong\u003eVQ40DE\u003c\/strong\u003e combustion chambers, OEM sensors encounter carbon blow-by, unburnt hydrocarbons, and silica deposits that foul the porous ceramic zirconia sensing element. Over time, internal heater element resistance degrades, leading to slow response times, erratic short-term fuel trim corrections, DTC fault codes (such as P0130, P0133, or P0150), rich or lean misfires, failed emissions tests, and excessive fuel consumption during open-to-closed-loop transitions.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis direct-fit upstream oxygen sensor utilizes an advanced planar zirconia ceramic element paired with an integrated fast-light-off internal heater circuit. The sensing cell rapidly reaches its required 600°F+ operating temperature to transition the ECU into closed-loop fueling quickly, reducing cold-start tailpipe emissions. Enclosed in a 304 stainless steel dual-protection sheath, the element resists thermal shock, particulate fouling, and physical impact. High-temperature PTFE insulated harness wiring and factory-pinned OE-style connectors guarantee consistent millivolt signaling back to the ECM without signal attenuation, ensuring precise stoichiometric air-fuel control (14.7:1 lambda target).\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1PCS Oxygen Sensor (Upstream Position)\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;\"\u003e2008-2010 Nissan Pathfinder\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;\"\u003eVQ40DE \/ R51\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;\"\u003e266 hp \/ 288 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;\"\u003eS4, 9038, 234-9038, 234-9038B, 1821382Z00, 22693-1AA0A, 22693-1AA0B, 22693-8W90A, 22693-ET000, 22693-JA00B, 22693-ZE00A, 22693-ZJ60B, 226931AA0A, 226931AA0B, 226938W90A, 22693ET000, 22693JA00B, 22693ZE00A, 22693ZJ60B, 250-54037, 250-54109, 25054037, 25054109, 25679, 15380B\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\u003e2008 Nissan Pathfinder 4.0L V6 (Upstream)\u003c\/li\u003e\n  \u003cli\u003e2009 Nissan Pathfinder 4.0L V6 (Upstream)\u003c\/li\u003e\n  \u003cli\u003e2010 Nissan Pathfinder 4.0L V6 (Upstream)\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 R51 Pathfinder?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2008-2010 Nissan Pathfinder equipped with the \u003cstrong\u003eVQ40DE\u003c\/strong\u003e 4.0L V6 engine; it does not fit 5.6L V8 (VK56DE) models.\u003c\/p\u003e\n\n\u003ch4\u003eIs thread anti-seize compound required during installation?\u003c\/h4\u003e\n\u003cp\u003eYes, apply a high-temperature anti-seize compound specifically formulated for oxygen sensors to the threads only, avoiding any contact with the sensor probe or perforated tip.\u003c\/p\u003e\n\n\u003ch3\u003eThe Nissan Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered for the demands of body-on-frame utility and heavy-duty towing, this oxygen sensor restores factory engine calibration, throttle responsiveness, and payload pulling power across rough terrain.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67551482478840,"sku":"DS-EQM0VBHZQ","price":59.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/o2-oxygen-sensor-upstream-for-nissan-pathfinder-2008-2010-4-0l-1.jpg?v=1790797030","url":"https:\/\/performancechiptuning.com\/products\/o2-oxygen-sensor-upstream-for-nissan-pathfinder-2008-2010-4-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}