VERY IMPORTANT. - Direct Fit Wideband Oxygen SensorAUDI A4 2.0 TFSI. Model: AUDI A4 2.0 TFSI. Also Known As: Lambda Sensor Oxygen Sensor O2 Sensor Wideband Wide Band. The Oxygen (Lambda) sensor is a sensor fitted in the exaust system which monitors the exhaust gasses and lets the ECU know if any changes in are needed in the air/fuel mixture.
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