J.C. Whitney Downstream Heated Oxygen Sensor

The J.C. Whitney Downstream Heated Oxygen Sensor is an OEM replacement O2 sensor (also called a post-catalytic converter oxygen sensor or rear O2 sensor). It is designed to restore proper exhaust monitoring when the original sensor has worn out or failed.

Key Features:

• Downstream position: installs after the catalytic converter to monitor converter efficiency
• Heated sensing element: reaches operating temperature quickly for accurate readings soon after a cold start
• 4-wire design: includes a signal circuit and a heater circuit, as specified for the original equipment sensor
• OEM replacement design: intended to match the form and function of the original sensor
• Helps the engine control module monitor emissions system performance

A worn or failing oxygen sensor can trigger the check engine light and cause emissions test failures. Replacing it with a sensor built to OEM-style requirements helps restore correct emissions monitoring. Each J.C. Whitney part number in this product line is a downstream heated oxygen sensor for a specific application.