OEM Subaru Sensor Assembly (Oxygen)

In need of a new O2 Sensor for your BRZ?

The Oxygen sensor attaches after the cat. This data is taken for two purposes:

1. For checking the efficiency of CAT.
2. For monitoring the emission from engine.

The O2 sensor is mounted in the exhaust manifold to monitor how much-unburned oxygen is in the exhaust as the exhaust exits the engine. Monitoring oxygen levels in the exhaust is a way of gauging the fuel mixture. It tells the computer if the fuel mixture is burning rich (less oxygen) or lean (more oxygen).

Any O2 sensor that is defective needs to be replaced. But there are also benefits to replacing the O2 sensor periodically for preventive maintenance. Replacing an aging O2 sensor that has become sluggish can restore peak fuel efficiency, minimize exhaust emissions and prolong the life of the converter.