O2sensorer

O2sensorer, also known as oxygen sensors or lambda sensors, are crucial components in modern internal combustion engines. Their primary function is to measure the amount of unburned oxygen present in the exhaust gases. This information is then relayed to the engine control unit (ECU), which uses it to adjust the air-fuel mixture for optimal combustion.

There are generally two main types of O2 sensors: zirconia and titania. Zirconia sensors are the most common and operate by creating a voltage proportional to the oxygen difference between the exhaust gas and the ambient air. Titania sensors, while less common, work differently by changing their electrical resistance based on oxygen content.

A properly functioning O2 sensor ensures that the engine runs efficiently, producing less harmful emissions. When an O2 sensor fails or becomes contaminated, it can lead to a range of problems. These can include decreased fuel economy, rough idling, increased emissions, and the illumination of the check engine light. Diagnosing an O2 sensor issue typically involves checking for fault codes stored in the ECU and visually inspecting the sensor for damage or corrosion. Replacing a faulty O2 sensor is a common maintenance task that can restore an engine's performance and efficiency.