{"product_id":"maxfavor-oxygen-sensor-pair-for-2008-2010-nissan-altima-maxima-2-5l-3-5l-upstream-234-9038-downstream-234-4381-direct-fit","title":"Maxfavor Oxygen Sensor Pair for 2008-2010 Nissan Altima \/ Maxima 2.5L \u0026 3.5L — Upstream 234-9038 + Downstream 234-4381, Direct-Fit","description":"\u003cb\u003eMaxfavor 2Pcs Oxygen Sensor set (234-9038 upstream + 234-4381 downstream) replaces factory O2 sensors on 2008–2010 Nissan Altima and Maxima with 2.5L and 3.5L engines.\u003c\/b\u003e\n\n\u003cp\u003eIf your check engine light points to an oxygen sensor fault or your vehicle shows reduced fuel efficiency, this matched pair from Maxfavor provides a like-for-like replacement for both upstream (pre-catalytic) and downstream (post-catalytic) positions. Each sensor is built to the vehicle fitment specifications for 2008–2010 Nissan Altima and Maxima models with 2.5L and 3.5L engines, and they come as a pair so you can restore accurate air-fuel feedback throughout the exhaust system.\u003c\/p\u003e\n\n\u003ch3\u003eHow will these sensors affect engine performance?\u003c\/h3\u003e\n\u003cp\u003eReplacing worn oxygen sensors helps the engine control module get correct air–fuel ratio data, which can normalize idle, reduce rough running, and help the fuel system operate efficiently. New sensors deliver steadier voltage responses than aged parts, improving the ECU’s adjustment accuracy.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003ePair includes upstream (234-9038) and downstream (234-4381) sensors.\u003c\/li\u003e\n  \u003cli\u003eDirect-fit connectors and thread sizes designed for specified Nissan models.\u003c\/li\u003e\n  \u003cli\u003eHelps restore consistent oxygen readings used by engine controls.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat should I check before buying and installing?\u003c\/h3\u003e\n\u003cp\u003eConfirm your vehicle year, engine displacement, and current sensor part numbers match the listing; the physical connector and thread must match the factory sensor. Also inspect wiring length and plug orientation so the harness reaches without strain.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify compatibility with 2008–2010 Altima and Maxima 2.5L \/ 3.5L engines.\u003c\/li\u003e\n  \u003cli\u003eCompare images and part numbers to your existing sensors before purchase.\u003c\/li\u003e\n  \u003cli\u003eEnsure connector pin count and wire routing match your factory harness.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat does installation involve and what tools are recommended?\u003c\/h3\u003e\n\u003cp\u003eInstallation is straightforward for a DIYer with basic hand tools and an oxygen sensor socket. Remove the old sensor, clean the threaded port, then fit the new sensor hand-tight before torquing to spec to avoid damage; reconnect the harness and clear any trouble codes if present.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eTools: oxygen sensor socket, ratchet, penetrating oil, anti-seize (if provided), torque wrench recommended.\u003c\/li\u003e\n  \u003cli\u003eSteps: locate and remove old sensor, compare new sensor, clean threads, install and torque, reconnect plug.\u003c\/li\u003e\n  \u003cli\u003eTip: allow the exhaust to cool and apply penetrating oil if the sensor is seized.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat warranty and after-sale support does Maxfavor provide?\u003c\/h3\u003e\n\u003cp\u003eMaxfavor includes a 1-year unlimited-mile warranty covering manufacturing defects, and they accept returns if the part does not fit—packaged and clean. Customer support is available by email with typical responses within 24 hours for fitment or installation questions.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e1-year unlimited-mile warranty against defects.\u003c\/li\u003e\n  \u003cli\u003eReturn accepted if the sensor does not match your vehicle—keep item clean.\u003c\/li\u003e\n  \u003cli\u003eSupport: contact Maxfavor by email for fitment help and follow-up within 24 hours.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This Maxfavor 2-piece oxygen sensor kit is aimed at Nissan owners and independent mechanics replacing faulty O2 sensors on 2008–2010 Altima and Maxima 2.5L or 3.5L engines. It’s suited to drivers who want a matched upstream\/downstream replacement set that fits factory locations and restores accurate exhaust monitoring without buying individual sensors separately.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Do these sensors fit all 2008–2010 Nissan Altima and Maxima engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: They fit 2008–2010 Altima and Maxima with 2.5L and 3.5L engines when part numbers and connector types match—compare to your existing sensors.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is any programming required after installation?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No special programming is normally needed; clear any diagnostic trouble codes after installation to reset the ECU readings.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Maxfavor","offers":[{"title":"Default Title","offer_id":67587633184953,"sku":"B07K896S8V","price":92.16,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/maxfavor-front-packaging-oxygen-sensor-pair.jpg?v=1790514581","url":"https:\/\/redleafauto.ca\/products\/maxfavor-oxygen-sensor-pair-for-2008-2010-nissan-altima-maxima-2-5l-3-5l-upstream-234-9038-downstream-234-4381-direct-fit","provider":"Redleaf Auto","version":"1.0","type":"link"}