Audi / Volkswagen Oxygen O2 Sensor - Post Cat Downstream Left 079906262H

The OXYGEN O2 SENSOR - POST CAT DOWNSTREAM, OEM part number 079906262H, is a critical component found on the left side of the exhaust system. Located after the catalytic converter, its primary function is to monitor the levels of unburned oxygen in the exhaust gases, enabling the engine control unit (ECU) to optimize fuel injection and reduce emissions. This sensor ensures compliance with emission standards while maximizing engine efficiency. Common issues prompting replacement include sensor failure caused by wear or contamination, leading to increased emissions and poor fuel economy. The O2 sensor is also known by alternative names such as Rear Oxygen Sensor and Oxygen Sen Kit. It is compatible with several Volkswagen models, including 2018-2016 Passat and CC equipped with a 3.6L V6 engine, as well as the 2009-2007 Touareg with a 4.2L V8 engine.