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

The Downstream Oxygen (O2) Sensor, also known as the oxygen sensor after the catalytic converter, is a crucial component of a vehicle's exhaust system. It measures the oxygen content in the exhaust gases after they have passed through the catalytic converter. The data from the downstream O2 sensor is used by the engine control unit (ECU) to monitor the efficiency of the catalytic converter and adjust the air-fuel mixture for optimal engine performance. 

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

• Check Engine Light: A faulty or failing downstream O2 sensor can trigger the check engine light on your vehicle's dashboard. This warning indicates that the sensor has detected a problem with the emissions system or catalytic converter.
• Decreased Fuel Efficiency: A failing downstream O2 sensor may provide inaccurate readings to the ECU, leading to an improper air-fuel mixture. This can result in decreased fuel efficiency, as the engine may not be running at its optimal efficiency.
• Poor Engine Performance: An unreliable downstream O2 sensor can cause the engine to run rough, hesitate, or experience a decrease in power and acceleration.
• Failed Emissions Test: If the downstream O2 sensor is malfunctioning, it can cause the vehicle to fail an emissions test. This is often due to improper readings and an inability to monitor the efficiency of the catalytic converter.
• Age and Mileage: While there is no specific lifespan for a downstream O2 sensor, it can wear out over time due to exposure to high exhaust temperatures and contaminants. As a general guideline, it is recommended to replace the downstream O2 sensor around 100,000 to 150,000 miles, depending on the manufacturer's recommendations.

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

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

Fits:

• 1996-2002 Nissan Pathfinder
  • VG33E equipped

NOTE: Right O2 Sensor for AT equipped models only.