The lowly oxygen sensor. So important, yet often ignored. The oxygen sensor does just what it says, it senses the amount of oxygen that is in your air-fuel mixture. This reading will then tell the car whether there is too much, or not enough oxygen being mixed with your gas. Too much oxygen causes the vehicle to run “lean,” not enough causes it to run “rich.”
When an engine is running lean more air is forced into the engine, creating a hotter explosion. This can lead to overheating the combustion chambers, which could cause pre-ignition, also known as knocking. Running an engine rich adds more gasoline to the mixture causing your engine to run a bit more sluggish and a decrease in fuel economy.
Newer vehicles have up to four O2 sensors, each monitoring the engines air-fuel mixture in different areas. More sensors means improved performance and less impact on the environment.
Bosch Oxygen Sensors
Properly functioning oxygen sensors are critical to a vehicle’s fuel efficiency and level of exhaust emissions. Check/replace at recommended intervals. Properly functioning oxygen sensors are important when it comes to your vehicle’s fuel efficiency and reducing harmful exhaust emissions. That’s why checking for, and possibly replacing, a worn-out oxygen sensor is an important part of every routine vehicle tune-up.