Bosch Heated Post-Cat Oxygen Sensor

The Bosch heated post-cat oxygen sensor (also called a downstream O2 sensor or rear oxygen sensor) monitors the exhaust gas after the catalytic converter. It sends data to the engine control module so the system can check catalytic converter efficiency and help keep emissions within limits.

Key Features:

• Built-in heating element brings the sensor to operating temperature quickly, so it can give accurate readings sooner after a cold start
• Designed for the downstream (post-catalytic converter) position in the exhaust system
• Helps the engine management system monitor catalyst performance
• Made by Bosch, a long-standing supplier of oxygen sensors and original equipment to automakers
• Sealed sensor construction is designed to hold up to exhaust heat, vibration, and road conditions

A worn or failing downstream oxygen sensor can trigger a check engine light and catalyst efficiency codes. It can also cause emissions problems. Replacing it with a Bosch heated sensor helps restore proper monitoring and dependable operation.