Volkswagen Audi A6 2.4L 2004-2011 Front Oxygen Sensor 030906262L 0258006422 Exact Fit

If your vehicle experiences rough idle, weak acceleration, noticeably higher fuel consumption, or the check engine light is on, this typically indicates the upstream oxygen sensor has aged or failed and cannot accurately monitor exhaust oxygen content. When functioning properly, it feeds back to the ECU to regulate the air-fuel ratio, ensuring combustion efficiency and emission compliance. OEM number 030906262L (corresponding to 0258006422), precisely fits the VW Audi A6 2.4L (2004–2011). Installation must occur with the engine cold; use a special socket to remove the old part; avoid contact between the sensor wiring and high-temperature exhaust components; torque recommended 45–55 Nm.