A-Premium Downstream Oxygen Sensor Replacement

The A-Premium Downstream Oxygen Sensor is a replacement O2 sensor (also called a post-catalytic converter oxygen sensor or rear O2 sensor) that monitors exhaust gases after the catalytic converter. It sends data to the engine control module so the system can check catalytic converter efficiency and help the engine run cleanly.

Key Features:

• Designed as a direct-fit replacement for the original downstream oxygen sensor
• Monitors oxygen content in the exhaust stream after the catalytic converter
• Helps the ECM evaluate catalyst performance and emissions control
• Built with a durable sensing element and a protective housing for the heat and vibration of exhaust service
• Includes a connector and wiring harness matched to the application for plug-and-play installation
• Quality-checked to meet or exceed OE form, fit, and function

A worn or failing downstream oxygen sensor can trigger a check engine light, cause poor fuel economy, or lead to a failed emissions test. Replacing it with an A-Premium sensor helps restore proper exhaust monitoring and engine management. Select the child item that matches your required part number.