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Why is my BMW 1 Series displaying an error code E46?

I noticed that my BMW 1 Series has been displaying an error code E46. What does this code mean and how can I fix it?

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The error code E46 indicates a malfunction in the fuel injection system. It could be caused by a clogged fuel filter or a faulty fuel pump. You should have a mechanic check the system to determine the exact cause.

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