Bosch Pre-Cat Oxygen Sensor

The Bosch Pre-Cat Oxygen Sensor (also called an upstream O2 sensor or air-fuel ratio sensor) mounts in the exhaust stream ahead of the catalytic converter. It measures the oxygen content of the exhaust gas and sends that signal to the engine control unit. The ECU uses it to adjust fuel delivery, which helps with efficient combustion, lower emissions and good drivability.

Key Features:

• Placed upstream of the catalytic converter to give the engine computer real-time feedback for fuel trim control
• Built to original equipment standards. Bosch is a leading OE supplier of oxygen sensors to automakers worldwide.
• Fast sensor response and stable signal output over the life of the part
• Heated sensing element for quick warm-up and closed-loop operation
• Durable, heat-resistant construction for the high temperatures and vibration of the exhaust system
• Many applications use a pre-installed connector and wiring harness, which simplifies installation

A worn or failing pre-cat oxygen sensor can cause poor fuel economy, rough idle, hesitation, increased emissions and a check engine light. Replacing it restores accurate fuel control and helps the engine run as designed. Select the child item that matches your application to get the right connector and wire length.