{"product_id":"oxygen-sensors-for-nissan-altima-2019-2021-2-5l-upstream","title":"Oxygen Sensors for Nissan Altima (2019-2021) 2.5L Upstream","description":"\u003ch2\u003eDirect-Fit Upstream Oxygen Sensor for 2019-2021 Nissan Altima\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Upstream Oxygen Sensor monitors pre-catalytic converter exhaust gas Lambda on the 2019-2021 Nissan Altima to provide rapid air-fuel feedback to the ECU, restoring factory fuel trims and throttle response.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Nissan Altima Sensor Degradation\u003c\/h3\u003e\n\u003cp\u003eUnder continuous high-heat duty cycles in the direct-injected \u003cstrong\u003ePR25DD\u003c\/strong\u003e engine, factory upstream air-fuel ratio sensors face severe thermal stress, particulate accumulation, and soot fouling. Over time, internal zirconia ceramic elements experience response degradation and internal heater circuit failure. This leads to slow sensor response, delayed closed-loop transitions, erratic idle, reduced fuel efficiency, and diagnostic trouble codes such as P0130 or P2A00 on the \u003cstrong\u003eL34\u003c\/strong\u003e chassis.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eManufactured to OEM telemetry specifications, this upstream oxygen sensor features a fast-acting ceramic planar element that reaches operating temperature in seconds for immediate closed-loop fuel management. Housed in laser-welded 304 stainless steel, it resists thermal shock, corrosion, and exhaust-stream vibration. Machine-rolled M18x1.5 threads ensure anti-cross-threading installation into the manifold bung, while heat-shielded PTFE wiring and factory-pinned weather-pack connectors integrate directly into the \u003cstrong\u003ePR25DD\u003c\/strong\u003e engine harness without splicing.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\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;\"\u003e2019-2021 Nissan Altima\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;\"\u003e\n\u003cstrong\u003ePR25DD\u003c\/strong\u003e \/ \u003cstrong\u003eL34\u003c\/strong\u003e\n\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;\"\u003e188 hp \/ 180 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;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2019 Nissan Altima S, SV, SL, SR, Platinum 2.5L FWD\/AWD\u003c\/li\u003e\n  \u003cli\u003e2020 Nissan Altima S, SV, SL, SR, Platinum 2.5L FWD\/AWD\u003c\/li\u003e\n  \u003cli\u003e2021 Nissan Altima S, SV, SL, SR, Platinum 2.5L FWD\/AWD\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the L34 Altima?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2019-2021 Nissan Altima equipped with the \u003cstrong\u003ePR25DD\u003c\/strong\u003e engine in the upstream exhaust manifold location.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill replacing this sensor turn off my Check Engine Light?\u003c\/strong\u003e\u003cbr\u003e Yes, once installed and drive cycles are completed, replacing a failing upstream sensor resolves open-circuit and slow-response diagnostic trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Nissan Precision Standard\u003c\/h3\u003e\n\u003cp\u003eDirect-injected engines require millivolt-precise stoichiometry to protect catalytic substrates, stabilize idle vacuum, and prevent power loss across the variable cam timing band.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50511714025720,"sku":"DS-EM7H57MPZ","price":76.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/oxygen-sensors-for-nissan-altima-2019-2021-2-5l-upstream-1.jpg?v=1789418198","url":"https:\/\/performancechiptuning.com\/fr\/products\/oxygen-sensors-for-nissan-altima-2019-2021-2-5l-upstream","provider":"Performance Chip Tuning","version":"1.0","type":"link"}