What Are Car Oxygen Sensors?

Answer Oxygen sensors have been integrated on vehicles for more than 30 years. Located in the exhaust system, they monitor fuel-to-air ratio and catalyst efficiency. While working in a hostile environment... Read More »

Top Q&A For: What Are Car Oxygen Sensors

What Are the Front & Rear Oxygen Sensors?

Since the introduction of the Onboard Diagnostics II (OBD II) system in 1995, two oxygen sensors -- front and rear -- monitor engine performance and emissions in all American-sold vehicles. These s... Read More »

What Is the Purpose of GM Rear Oxygen Sensors?

The purpose of a GM rear oxygen sensor is to determine exhaust temperature as it exits the catalytic converter. The information it gathers is sent to the vehicle's computer, and the computer adjust... Read More »

How to Fix Oxygen Sensors?

Oxygen sensors--also called o2 sensors--are used by your vehicle's computer to monitor and adjust the air-to-fuel ratio being pumped into your engine. These sensors are designed to be "disposable;"... Read More »

How to Fix Upstream Oxygen Sensors?

Your vehicle's computer uses oxygen sensors to monitor and adjust the ratio of fuel and air being pumped into your engine's combustion chambers. Newer vehicles--post 1990, typically--have at least ... Read More »