Please check fitment notes & description for accurate information.Audi A4 Base 3.0L 2005Audi A4 Cabriolet 3.0L 2005Audi A4 Quattro Avant 3.0L 2005Audi A4 Quattro Base 3.0L 2005Audi A4 Quattro Cabriolet 3.0L 2005-2006 Oxygen Sensor's Location: How do I know the O2 sensor is good or not? Check engine light on A reduction in fuel economy. Your catalytic converter fails unexpectedly Exhaust emissions reach undesirable levels. .
