Description
The upstream Air-Fuel Ratio sensor is one of the most vital components of your Toyota 4Runner’s engine management system. Located in the exhaust before the catalytic converter, this sensor provides precise data to the ECU, ensuring your engine burns fuel at the most efficient ratio. A failing A/F sensor can trigger a “Check Engine” light and lead to noticeable problems like poor fuel economy, rough idling, and reduced power. Our high-quality, direct-fit replacement sensor is engineered to provide accurate readings, correcting your air/fuel mixture and protecting your catalytic converter from long-term damage.
