Familiar Signs of an O2 Sensor Failure in Your Volkswagen Volkswagens are recognized for their distinguishable designs and safety. They provide drivers with a smooth and comfortable ride. VW's are highly dependable but do see some common component failures such as O2 sensor failure. The O2 sensor is also known as the oxygen sensor. It is a critical component of the exhaust system. Its function is to measure oxygen levels. This helps the computer determine the proper air to fuel ratio. Without the correct ratio, the performance of your Volkswagen will be greatly impacted. If the O2 sensor fails, the combustion process in the engine will be affected. This can lead to high emissions, and damage to the engine and catalytic converter. Symptoms of O2 Sensor Failure in Your Volkswagen ... read more