Maxfavor O2 Sensor 2-Pc Kit (234-9038/234-4381) for 2008–2010 Nissan Altima & Maxima — Upstream/Downstream Direct-Fit Plug-and-Pla

If your vehicle’s check engine light, fuel economy, or idle behavior points toward an oxygen sensor issue, this matched upstream and downstream pair from Maxfavor is built to match factory fitment and wiring layout. Each sensor is manufactured from durable materials and pre-configured to plug into the original harness so you can replace both bank sensors in one service interval. The kit is intended to help your engine control module regain correct air-fuel data without swapping multiple aftermarket parts.

How do these sensors fit my 2008–2010 Nissan Altima or Maxima?

These two sensors are specified for the 2.5L and 3.5L engines and designed to match OE mounting points and electrical connectors. Verify compatibility by cross-checking the part numbers and physically comparing connectors and thread types before installation.

• Includes upstream (234-9038) and downstream (234-4381) O2 sensors
• Fits 2008, 2009, 2010 Nissan Altima and Maxima 2.5L/3.5L engines
• Direct-fit plug-and-play wiring for original connector compatibility
• Compare pictured sensor shape, connector, and thread pitch to your old parts

What steps are recommended for a safe, correct installation?

Installation is straightforward if you have basic hand tools and a sensor socket. Remove the old sensor, clean the threaded port, and gently thread in the new unit, taking care not to damage the harness; after installation, clear codes if the vehicle had a stored diagnostic trouble code.

• Locate sensor positions and remove with an appropriate socket
• Compare new and old sensors to confirm match before final tightening
• Clean threads to ensure a proper seal and avoid leaks
• Tighten gently and secure wiring away from hot or moving parts

What performance and durability features does the Maxfavor kit offer?

Maxfavor constructs these sensors from corrosion-resistant materials intended to endure exhaust exposure and temperature cycles. While no aftermarket part can promise identical longevity as every use case differs, the pair is built to provide stable oxygen readings and maintain catalytic converter monitoring when properly installed.

• High-quality materials resist heat and exhaust contaminants
• Durable construction for consistent sensor output over time
• Factory-style design for reliable emissions system monitoring
• Sold as a matched upstream/downstream set for balanced replacement

What should I check before buying or returning this kit?

Confirm your vehicle year, engine size, and the original sensor part numbers against this listing and the photos. If the parts differ from your existing sensors, do not install; Maxfavor accepts returns within the warranty window when items are clean and packaged correctly.

• Match your OEM part numbers and connector shape to the listing photos
• Check thread size and lead length for compatibility with your exhaust layout
• Contact seller support with fitment questions before installation
• Keep items clean and in original packaging if returning under warranty

Who is this for: This Maxfavor 2-piece oxygen sensor kit is aimed at do-it-yourselfers, independent mechanics, and fleet owners who need a cost-effective, direct-fit replacement for worn or failed O2 sensors on 2008–2010 Nissan Altima and Maxima 2.5L and 3.5L engines. It’s also suitable for anyone replacing both upstream and downstream sensors together to restore accurate emissions monitoring and engine control readings.