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Replacing the Lambda Sensor on the Exhaust Pipe

Model: BMW Serie 5 E39 - Years 1995-2003
Part: Oxygen sensor

The lambda sensor should be replaced frequently, especially if you notice a loss of power, excessive fuel consumption, and polluted exhaust gases. The lambda sensor is a device that monitors the pollutants in the exhaust gases to maintain the air-fuel ratio (kg air/kg fuel) within the optimal efficiency range of the catalytic converter. The output signal from the sensor is an electrical signal sent to the fuel injector control unit. Due to high temperatures, replace the sensor when the engine is very cold. Using a simple wrench, unscrew the sensor and then disconnect the connector. For safety, after replacing the sensor, drive several miles and then retest with the appropriate equipment to verify that the pollution parameters are back within limits.

Updated on 7 February 2026 by ScegliAuto

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