Direct Fit Wideband Oxygen SensorAUDI TT 2.0 TFSI. Model: AUDI TT 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.
eBay