2X Oxygen O2 Sensor 1 & 2 | for 2005 2006 2007 2008 Audi A4 A4 Quattro 2.0L Upstream + Downstream

The 2X Oxygen O2 Sensor for the Audi A4 has garnered a mixed reception among customers. Many users highlight the effectiveness of the product, particularly for fixing issues related to running lean in their vehicles. One notable review from an owner of a 2008 Audi A4 2.0t Quattro commended the product for successfully resolving their engine problem. However, some customers reported complications, such as the upstream sensor continuing to throw a code even after replacement, leading to uncertainties about whether the issue lay with the sensor itself or perhaps the catalytic converter or downpipe. Additionally, while one reviewer mentioned that the upstream sensor fit correctly, they found that the downstream sensor did not, though they were still able to make it work. Overall, the O2 sensor package appears to be effective for many users but may encounter compatibility issues for some Audi A4 models, raising questions about the quality control of specific pieces. **