Direct Fit Wideband Oxygen SensorFORD FOCUS MK2 2.5 ST. Also Known As: Lambda Sensor, Oxygen Sensor, O2 Sensor, Wideband, Wide Band. Model: FORD FOCUS MK2 2.5 ST. 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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