what is a o2 sensor

An O2 sensor, also known as an oxygen sensor, is a critical component in the exhaust system of a vehicle. It measures the amount of oxygen present in the exhaust gases and sends this information to the engine control unit (ECU). The ECU uses this data to adjust the air-fuel mixture for optimal combustion, which helps improve fuel efficiency and reduce harmful emissions. The O2 sensor is essential for maintaining peak engine performance and ensuring that the vehicle meets emissions standards. It plays a crucial role in monitoring and controlling the engine's fuel-air ratio, helping to maximize fuel economy and minimize pollution. Without a functioning O2 sensor, the vehicle may experience decreased fuel efficiency, increased emissions, and potential damage to the engine. Replacing a faulty O2 sensor is important for maintaining the overall health and performance of the vehicle. It is recommended to regularly inspect and replace the O2 sensor as part of regular vehicle maintenance to ensure optimal engine performance and reduced environmental impact.