If your engine has a check engine light caused by the O2 sensor, replace it with this new unit. The O2 sensor measures the amount of unburned fuel in the exhaust pipe to adjust fuel mapping for less emissions and better fuel economy. When this sensor is malfunctioning, your MPG and performance will suffer. This sensor is replaced fairly easily, and can restore your performance and mileage quickly. Put some anti seize on the threads to prevent it from becoming a permanent part of the exhaust.
This Part Fits the Following Vehicles
|Audi||B5 A4||FWD||V6 30v|
|Audi||B5 A4||Quattro||V6 30v|