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What causes the check engine light to turn on in a BMW X5?

I recently purchased a used BMW X5 and noticed that the check engine light has turned on. What could be causing this and how can I fix it?

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The most common cause of the check engine light turning on in a BMW X5 is a faulty oxygen sensor. It is important to get this fixed as soon as possible because it can affect the performance of your car and lead to expensive repairs.

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Another possible cause could be an issue with the catalytic converter. This is a crucial component of your car's emissions system and if it is not functioning properly, it can cause your check engine light to turn on. It is best to have a professional mechanic inspect and replace the catalytic converter if necessary.

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