A-Premium Downstream O2 Oxygen Sensor for Nissan & Infiniti — Heated 4‑Wire, Threaded Direct-Fit

A-Premium Downstream O2 Oxygen Sensor is a direct-fit, heated 4-wire replacement engineered for select Nissan and Infiniti V6/V8 models to restore accurate downstream exhaust readings and emissions performance.

This downstream oxygen sensor from A-Premium swaps into the factory location on the exhaust system to monitor post-catalytic converter oxygen levels. It’s designed as a threaded, heated sensor with a four-wire connector for reliable electrical connection and quicker warm-up. The part fits multiple Nissan and Infiniti vehicles from the early-to-mid 2000s and is sold individually in a protective box with a one-year unlimited-mileage guarantee.

Which models and years does this downstream sensor fit?

This A-Premium oxygen sensor covers both left/right and front/rear downstream positions across a range of Nissan and Infiniti vehicles. Fitment varies by model and year, so verify the exact sensor location on your vehicle before ordering.

• Nissan Altima 2005–2006 V6 3.5L; 350Z 2003–2006 V6 3.5L (Downstream Left/Right)
• Infiniti FX35 2003–2006 V6 3.5L; FX45 2003–2008 V8 4.5L (Downstream Left/Right)
• Infiniti G35 2003–2006 V6 3.5L; M35 2006 V6 3.5L; M45 2003–2004, 2006–2010 V8 4.5L; Q45 2002–2006 V8 4.5L
• Nissan Maxima 2004–2007 V6 3.5L; Quest 2004–2009 V6 3.5L (Downstream Front/Rear)

How is this sensor specified and installed?

The A-Premium part is a threaded, heated oxygen sensor that uses a four-wire male connector for direct electrical compatibility. Installation typically requires an O2 sensor socket or wrench and standard workshop safety practices. If your vehicle has a connector that matches the supplied male plug and the thread pitch matches the factory bung, it’s intended for bolt-in replacement.

• Sensor type: heated zirconia-style O2 sensor
• Wiring: 4 wires (signal, ground, heater power, heater ground)
• Mounting: threaded factory-style installation
• Connector: male plug — verify against vehicle harness

What reference numbers and parts cross does it cover?

This replacement lists multiple reference numbers to help confirm compatibility with original equipment and aftermarket catalogs. Use these identifiers when cross-checking with your vehicle’s part history or service records before purchase.

• Cross-reference: 250-24403, 25024403, 250-24448, 25024448
• OEM/alternate numbers: 226A08J010, 226A1AR210, 226A1-8U700, 226A18U700
• Sold as: single oxygen sensor in boxed packaging

What warranty and quality assurances are provided?

A-Premium backs this part with a one-year unlimited-mileage warranty covering manufacturing defects. The sensor ships boxed to protect the tip and connector; inspect the wiring and threads on arrival for shipping damage before installation.

• Warranty: 1-year unlimited-mileage guarantee from A-Premium
• Packaging: protective box to prevent tip or connector damage
• Support: contact A-Premium for fitment or warranty assistance

Who this is for: This downstream O2 sensor is aimed at DIY mechanics, professional technicians, and vehicle owners restoring emissions control or addressing downstream oxygen sensor trouble codes on compatible Nissan and Infiniti models. Choose this part when you need a heated, 4-wire threaded sensor that matches common OEM reference numbers and offers a straightforward plug-and-play replacement for the listed years and engine types.