OEM Upstream O2 Sensor for 1996-2002 Nissan Pathfinder models equipped with the VG33E powertrain.

The Upstream O2 (O2) Sensor , also known as the front O2 sensor, is a crucial component of a vehicle's emissions control system. It is located in the exhaust manifold or exhaust pipe before the catalytic converter. The O2 sensor measures the oxygen content in the exhaust gases and provides feedback to the engine control module (ECM) for optimal fuel-air mixture adjustments.

Here are some signs that the upstream O2 sensor may need to be replaced:

• Check Engine Light: If the upstream O2 sensor malfunctions or detects an issue with the fuel-air mixture, it will trigger the check engine light on the vehicle's dashboard. It is important to retrieve the diagnostic trouble code (DTC) using an OBD-II scanner to pinpoint the exact issue.
• Poor Fuel Economy: A faulty upstream O2 sensor can provide inaccurate readings to the ECM, leading to improper fuel-air mixture adjustments. This can result in decreased fuel efficiency and increased fuel consumption.
• Rough Idle or Poor Performance: A malfunctioning O2 sensor can cause the engine to run rough at idle or during acceleration. It may result in a lack of power, hesitation, or sluggish performance.
• Increased Emissions: The O2 sensor plays a vital role in the emission control system. If it fails, the vehicle may produce higher levels of harmful emissions, which can lead to a failed emissions test.
• Age and Mileage: O2 sensors have a lifespan of approximately 50,000 to 100,000 miles (80,000 to 160,000 kilometers) depending on the vehicle and driving conditions. If your vehicle has reached this mileage range, it may be time to consider replacing the upstream O2 sensor as part of preventative maintenance.

Replace your insufficient Upstream O2 Sensor with this genuine Nissan replacement part.

Please refer to the diagram provided to verify part placement.

Please select the appropriate side from the options drop-down.

Fits:

• 1996-2002 Nissan Pathfinder 
  • VG33E equipped