Every new BMW, and all BMW cars made from 1980 on, have an oxygen sensor, often called an "O2 sensor". The oxygen sensor is part of your BMW's emissions control system and feeds data to BMW engine management computer. The oxygen sensor is positioned in the exhaust pipe and can detect rich and lean mixtures.
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Failing O2 sensors will trigger your BMW's check engine light, put your BMW into a lean or rich running state. This can affect gas mileage and even cause engine or cat damage. O2 sensor replacement is straight forward and cheap insurance.
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Oxygen sensors constantly monitor engine emissions and relays this data to the DME. Using these readings the computer determines the proper air/fuel mixture as well as how efficiently the catalyst system is functioning. Symptoms of a failed oxygen sensor range from an EML to poor fuel economy and severe loss of power.
2018 2019 2020 2021 2022 BMW G30 G11 X5 X6 X7 Regulating Lambda Probe Oxygen Sensor 11787935100 OEM OE. A common source of check engine lights is a failed or failing oxygen sensor. When the O2 sensor can't register oxygen content before and after your catalytic converter, it doesn't know what to do with the fuel mixture and will default to run rich.
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